Sample Erosion a Sedimentation Control Plan
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Attached is a sample erosion and sedimentation control plan based on one IURPWKH¿OHVRIWKHVWDWHRI1RUWK&DUROLQD7KHVLWHLVORFDWHGLQWKH3LHGPRQW UHJLRQ7KHSODQZDVPRGL¿HGWRGHPRQVWUDWHWKHDSSOLFDWLRQRIDYDULHW\RI HURVLRQDQGVHGLPHQWDWLRQFRQWUROSUDFWLFHVFRPPRQO\XVHGWKURXJKRXWWKH 6WDWH This sample plan was developed in detail for instructive purposes. The VSHFL¿FQXPEHURIPDSVSUDFWLFHVGUDZLQJVVSHFL¿FDWLRQVDQGFDOFXODWLRQV UHTXLUHGGHSHQGVRQWKHVL]HDQGFRPSOH[LW\RIWKHGHYHORSPHQW7KHGHVLJQHU should select the most practical and effective practices to control erosion and SUHYHQW VHGLPHQW IURP OHDYLQJ WKH VLWH 7KH SODQ VKRXOG EH RUJDQL]HG DQG SUHVHQWHG LQ D FOHDU FRQFLVH PDQQHU 6XI¿FLHQW GHVLJQ DQG EDFNJURXQG LQ formation should be included to facilitate review by erosion control personnel. Construction details should be precise and clear for use by an experience JHQHUDOFRQWUDFWRU $QDFFHSWDEOHHURVLRQDQGVHGLPHQWDWLRQFRQWUROSODQPXVWFRQWDLQ 1. brief narrative FRQVWUXFWLRQVFKHGXOH 3. maintenance plan YLFLQLW\PDS VLWHWRSRJUDSKLFPDS 6. site development plan HURVLRQDQGVHGLPHQWDWLRQFRQWUROSODQGUDZLQJ GHWDLOGUDZLQJVDQGVSHFL¿FDWLRQV YHJHWDWLYHSODQ VXSSRUWLQJFDOFXODWLRQV ¿QDQFLDOUHVSRQVLELOLW\RZQHUVKLSIRUP FKHFNOLVW
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SAMPLE EROSION AND SEDIMENTATION CONTROL PLAN ABC INDUSTRIES, INC. DEAL, N.C. SEPTEMBER 1988
TABLE OF CONTENTS Page Narrative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.4 Construction Schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.8 Maintenance Plan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.9 Vicinity Map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.9 Site Topographic Map. . . . . . . . . . . . . . . . . . . . . . . . . Exhibit 1 Site Development Plan . . . . . . . . . . . . . . . . . . . . . . . . Exhibit 2 Site Erosion and Sedimentation Control Plan . . . . . . . . . . . . . Exhibit 3 'HWDLO'UDZLQJVDQG6SHFL¿FDWLRQVIRU3UDFWLFHV6SHFL¿HG. . . . . . . . . . 7.11 Vegetation Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.30 Supporting Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . 7.33 Financial Responsibility/Ownership Form . . . . . . . . . . . . . . . . . . 7.51 Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.53
7.3
NARRATIVE Project Description
7KH SXUSRVH RI WKH SURMHFW LV WR FRQVWUXFW WZR ODUJH FRPPHUFLDO EXLOGLQJV
with associated paved roads and parking area.
Another building will be added in the
IXWXUH$SSUR[LPDWHO\DFUHVZLOOEHGLVWXUEHGGXULQJWKLVFRQVWUXFWLRQSHULRG7KH VLWHLVDFUHVORFDWHGLQ*UDQYLOOHFRXQW\PLOHVQRUWKRI'HDO1&RII7HUUL Road (see Vicinity Map). Site Description
7KHVLWHKDVUROOLQJWRSRJUDSK\ZLWKVORSHVJHQHUDOO\WR6ORSHVVWHHSHQ
WR WR LQ WKH QRUWKZHVW SRUWLRQ RI WKH SURSHUW\ ZKHUH D VPDOO KHDOHGRYHU JXOO\VHUYHVDVWKHSULQFLSDOGUDLQDJHZD\IRUWKHVLWH7KHVLWHLVQRZFRYHUHGZLWK YROXQWHHUKHDY\ZRRG\YHJHWDWLRQSUHGRPLQDQWO\SLQHVWRIWKLJK7KHUHLVQR HYLGHQFHRIVLJQL¿FDQWHURVLRQXQGHUSUHVHQWVLWHFRQGLWLRQV7KHROGGUDLQDJHJXOO\ LQGLFDWHVVHYHUHHURVLRQSRWHQWLDODQGUHFHLYHVÀRZIURPDFUHVRIZRRGVRIIVLWH 7KHUHLVRQHODUJHRDNWUHHORFDWHGLQWKHZHVWHUQFHQWUDOSRUWLRQRIWKHSURSHUW\ DQGDEXIIHUDUHDIURQWLQJ7HUUL5RDGWKDWZLOOEHSURWHFWHGGXULQJFRQVWUXFWLRQ Adjacent Property Land use in the vicinity is commercial/industrial.
The land immediately to the
ZHVW DQG VRXWK KDV EHHQ GHYHORSHG IRU LQGXVWULDO XVH $UHDV WR WKH QRUWK DQG HDVW are undeveloped and heavily wooded, primarily in volunteer pine.
Hocutt Creek, the
RIIVLWH RXWOHW IRU UXQRII GLVFKDUJH LV SUHVHQWO\ D ZHOOVWDELOL]HG JHQWO\ÀRZLQJ perennial stream.
Sediment control measures will be taken to prevent damage to Hocutt
&UHHN$SSUR[LPDWHO\DFUHVRIZRRGHGDUHDWRWKHHDVWFRQWULEXWHUXQRIILQWRWKH construction area. Soils The soil in the project area is mapped as Creedmore sandy loam in B and C slope classes.
Creedmoor soils are considered moderately well to somewhat poorly drained
ZLWKSHUPHDELOLW\UDWHVJUHDWHUWKDQLQFKHVKRXUDWWKHVXUIDFHEXWOHVVWKDQ LQFKHVKRXULQWKHVXEVRLO7KHVXEVXUIDFHLVSDOHEURZQVDQG\ORDPLQFKHVWKLFN 7KHVXEVRLOFRQVLVWVRIDSDOHEURZQDQGEURZQLVK\HOORZVDQG\FOD\ORDPUDQJLQJWR OLJKWJUD\FOD\LQFKHVWKLFN%HORZLQFKHVLVDOD\HURI¿QHVDQG\ORDPWR LQFKHV7KHVRLOHURGLELOLW\IDFWRU .YDOXH UDQJHVIURPDWWKHVXUIDFHWR in the subsoil. 'XH WR WKH VORZ SHUPHDELOLW\ RI WKH VXEVRLO WKDW ZLOO EH H[SRVHG GXULQJ JUDGLQJ D VXUIDFHZHWQHVVSUREOHPZLWKKLJKUXQRIILVDQWLFLSDWHGIROORZLQJVLJQL¿FDQWUDLQIDOO events.
No groundwater problem is expected.
The tight clay in the subsoil will make
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7.4
Planned Erosion and Sedimentation Control Practices 1.
6HGLPHQW%DVLQ3UDFWLFH $VHGLPHQWEDVLQZLOOEHFRQVWUXFWHGLQWKHQRUWKZHVWFRUQHURIWKHSURSHUW\ $OO ZDWHU IURP GLVWXUEHG DUHDV DERXW DFUHV ZLOO EH GLUHFWHG WR WKH EDVLQ EHIRUHOHDYLQJWKHVLWH NOTE:
The undisturbed areas to the east and north
could have been diverted, but this was not proposed because it would have required clearing to the property line to build the diversion and the required RXWOHWVWUXFWXUH 6HHSDJHVIRUGHWDLOVDQGSDJHVIRU supporting calculations. 2.
Temporary Gravel Construction Entrance/E[LW3UDFWLFH $WHPSRUDU\JUDYHOFRQVWUXFWLRQHQWUDQFHZLOOEHLQVWDOOHGQHDUWKHQRUWKZHVW FRUQHURIWKHSURSHUW\'XULQJZHWZHDWKHULWPD\EHQHFHVVDU\WRZDVKYHKLFOH WLUHVDWWKLVORFDWLRQ7KHHQWUDQFHZLOOEHJUDGHGVRWKDWUXQRIIZDWHUZLOO EHGLUHFWHGWRDQLQOHWSURWHFWLRQVWUXFWXUHDQGDZD\IURPWKHVWHHS¿OODUHD WRWKHQRUWK6HHSDJHIRUVSHFL¿FDWLRQV
3.
7HPSRUDU\%ORFNDQG*UDYHO'URS,QOHW3URWHFWLRQ3UDFWLFH A temporary block and gravel drop inlet protection device will be installed at WKHGURSLQOHWORFDWHGRQWKHVRXWKVLGHRIWKHFRQVWUXFWLRQHQWUDQFH5XQRII IURPWKHGHYLFHZLOOEHGLUHFWHGLQWRWKHVHGLPHQWEDVLQ NOTE:
The presence
RI WKLV GHYLFH UHGXFHV WKH VHGLPHQW ORDG RQ WKH VHGLPHQW EDVLQ DQG SURYLGHV VHGLPHQWSURWHFWLRQIRUWKHSLSH,QDGGLWLRQVHGLPHQWUHPRYDODWWKLVSRLQW LVPRUHFRQYHQLHQWWKDQIURPWKHEDVLQ 6HHSDJHIRUVSHFL¿FDWLRQV 4.
7HPSRUDU\'LYHUVLRQV3UDFWLFH 7HPSRUDU\ GLYHUVLRQV ZLOO EH FRQVWUXFWHG DERYH WKH FXW VORSHV VRXWK RI %XLOGLQJV$DQG%WRSUHYHQWVXUIDFHUXQRIIIURPHURGLQJWKHVHEDQNV NOTE: 6HGLPHQWIUHHZDWHUPD\EHGLYHUWHGDZD\IURPWKHSURMHFWVHGLPHQWEDVLQ $ WHPSRUDU\GLYHUVLRQZLOOEHFRQVWUXFWHGQHDUWKHPLGGOHRIWKHGLVWXUEHGDUHD to break up this long, potentially erosive slope should the grading operation be temporarily discontinued.
A temporary diversion will be constructed along
WKHWRSHGJHRIWKH¿OOVORSHDWWKHHQGRIHDFKGD\GXULQJWKH¿OOLQJRSHUDWLRQ WRSURWHFWWKH¿OOVORSH7KLVWHPSRUDU\GLYHUVLRQZLOORXWOHWWRWKHH[LVWLQJ XQGLVWXUEHG FKDQQHO QHDU WKH QRUWK HGJH RI WKH FRQVWUXFWLRQ VLWH DQGRU WR WKHWHPSRUDU\LQOHWSURWHFWLRQGHYLFHDWWKHFRQVWUXFWLRQHQWUDQFHDVWKH¿OO HOHYDWLRQLQFUHDVHV6HHSDJHIRUVSHFL¿FDWLRQVDQGSDJHV IRU supporting calculations. 5.
/HYHO6SUHDGHU3UDFWLFH $ OHYHO VSUHDGHU ZLOO VHUYH DV WKH RXWOHW IRU WKH GLYHUVLRQ HDVW RI %XLOGLQJ $ DQG VRXWK RI %XLOGLQJ % 7KH DUHD EHORZ WKH VSUHDGHU LV UHODWLYHO\ VPRRWK DQG KHDYLO\ YHJHWDWHG ZLWK D VORSH RI DSSUR[LPDWHO\ 6HH SDJH IRU VSHFL¿FDWLRQV
7UHH3UHVHUYDWLRQDQG3URWHFWLRQ3UDFWLFH $PLQLPXPIWKLJKSURWHFWLYHIHQFHZLOOEHHUHFWHGDURXQGWKHODUJHRDNWUHH DWWKHGULSOLQHWRSUHYHQWGDPDJHGXULQJFRQVWUXFWLRQ6HGLPHQWIHQFHPDWHULDOV
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PD\EHXVHGIRUWKLVSXUSRVH6HHSDJHIRUVSHFL¿FDWLRQV 7.
/DQG*UDGLQJ3UDFWLFH +HDY\JUDGLQJZLOOEHUHTXLUHGRQDSSUR[LPDWHO\DFUHV7KHÀDWWHUVORSHDIWHU JUDGLQJZLOOUHGXFHWKHRYHUDOOHURVLRQSRWHQWLDORIWKHVLWH7KHEXLOGLQJV will be located on the higher cut areas, and the access road and open landscaped DUHDVZLOOEHORFDWHGRQ¿OODUHDV6HHSDJHVIRUVSHFL¿FDWLRQV $OOFXWVORSHVZLOOEH RUÀDWWHUWRDYRLGLQVWDELOLW\GXHWRZHWQHVVSURYLGH ¿OOPDWHULDOJLYHDQRSHQDUHDDURXQGWKHEXLOGLQJVDQGDOORZYHJHWDWHGVORSHV WREHPRZHG&XWVORSHVZLOOEH¿QHJUDGHGLPPHGLDWHO\DIWHUURXJKJUDGLQJ WKH VXUIDFH ZLOO EH GLVNHG DQG YHJHWDWHG DFFRUGLQJ WR WKH 9HJHWDWLRQ 3ODQ SDJHV )LOOVORSHVZLOOEH ZLWK¿OOGHSWKVDVPXFKDVWRIW)LOOZLOOEH placed in layers not to exceed 9 inches in depth and compacted.
(NOTE:
Fills
RI WKLV GHSWK VKRXOG KDYH GHWDLOHG FRPSDFWLRQ VSHFL¿FDWLRQV LQ WKH JHQHUDO FRQVWUXFWLRQ FRQWUDFW 7KHVH VSHFL¿FDWLRQV DUH QRW SDUW RI WKH HURVLRQ DQG sedimentation control plan.) 7KH¿OOVORSHLQWKHQRUWKSRUWLRQRIWKHSURSHUW\LVWKHPRVWYXOQHUDEOHDUHD WRHURVLRQRQWKHVLWH7HPSRUDU\GLYHUVLRQVZLOOEHPDLQWDLQHGDWWKHWRSRI WKLV¿OOVORSHDWDOOWLPHVDQGWKH¿OOLQJRSHUDWLRQZLOOEHJUDGHGWRSUHYHQW RYHUÀRZ WR WKH QRUWK )LOOLQJ ZLOO EH GRQH DV D FRQWLQXRXV RSHUDWLRQ XQWLO ¿QDOJUDGHLVUHDFKHG7KHSDYHGURDGORFDWHGRQWKH¿OOZLOOEHVORSHGWRWKH VRXWK DQG ZLOO IXQFWLRQ DV D SHUPDQHQW GLYHUVLRQ 7KH DUHD DGMDFHQW WR WKH URDGVDQGSDUNLQJDUHDZLOOEHJUDGHGWRFRQGXFWUXQRIIWRWKHURDGFXOYHUWV 5XQRIIZDWHUIURPWKHEXLOGLQJVZLOOEHJXWWHUHGWRWKHYHJHWDWHGFKDQQHOV7KH ¿QLVKHGVORSHIDFHWRWKHQRUWKZLOOQRWEHEDFNEODGHG7KHWRSWRLQFKHV ZLOOEHOHIWLQDORRVHDQGURXJKHQHGFRQGLWLRQ3ODQWLQJVZLOOEHSURWHFWHG ZLWKPXOFKDVVSHFL¿HGLQWKH9HJHWDWLRQ3ODQ $PLQLPXPIWXQGLVWXUEHGEXIIHU]RQHZLOOEHPDLQWDLQHGDURXQGWKHSHULPHWHU RI WKH GLVWXUEHG DUHD 127( 7KLV ZLOO UHGXFH ZDWHU DQG ZLQG HURVLRQ KHOS FRQWDLQVHGLPHQWUHGXFHGXVWDQGUHGXFH¿QDOODQGVFDSLQJFRVWV 8.
7HPSRUDU\6HGLPHQW7UDS3UDFWLFH $VPDOOVHGLPHQWWUDSZLOOEHFRQVWUXFWHGDWWKHLQWHUVHFWLRQRIWKHH[LVWLQJ road ditch and channel number 3 to protect the road ditch.
Approximately 2
DFUHVRIGLVWXUEHGDUHDZLOOGUDLQLQWRWKLVWUDS6HHSDJHV IRU VSHFL¿FDWLRQVDQGSDJHV IRUFDOFXODWLRQV 9.
6HGLPHQW)HQFH3UDFWLFH $VHGLPHQWIHQFHZLOOEHFRQVWUXFWHGDURXQGWKHWRSVRLOVWRFNSLOHDQGDORQJWKH FKDQQHOEHUPDGMDFHQWWRWKHGHHSFXWDUHDDVQHFHVVDU\WRSUHYHQWVHGLPHQWIURP HQWHULQJWKHFKDQQHOV6HHSDJHIRUVSHFL¿FDWLRQV
10.
6RG'URS,QOHW3URWHFWLRQ3UDFWLFH Permanent sod drop inlet protection will replace the temporary block and gravel
7.6
structure when the contributing drainage area has been permanently seeded and PXOFKHG6HHSDJHVIRUVSHFL¿FDWLRQV 11.
*UDVV/LQHG&KDQQHO3UDFWLFH *UDVVOLQHGFKDQQHOVZLWKWHPSRUDU\VWUDZQHWOLQHUVZLOOEHFRQVWUXFWHGDURXQG Buildings A and B to collect and convey site water to the project’s sediment EDVLQ 6HH SDJHV IRU VSHFL¿FDWLRQV DQG SDJHV IRU calculations. 6KRXOGWKHGLVWXUEHGDUHDVDGMRLQLQJWKHFKDQQHOVQRWEHVWDELOL]HGDWWKHWLPH WKHFKDQQHOVDUHYHJHWDWHGDVHGLPHQWIHQFHZLOOEHLQVWDOOHGDGMDFHQWWRWKH channel to prevent channel siltation.
12.
5LSUDS/LQHGDQG3DYHG&KDQQHOV3UDFWLFH $ULSUDSFKDQQHOZLOOEHFRQVWUXFWHGLQWKHROGJXOO\DORQJWKHQRUWKVLGHRI WKHSURSHUW\VWDUWLQJLQWKHQRUWKZHVWFRUQHUDIWHUDOORWKHUFRQVWUXFWLRQLV FRPSOHWH7KLVFKDQQHOZLOOUHSODFHWKHROGJXOO\DVWKHSULQFLSDORXWOHWIURP WKH VLWH 6HH SDJHV IRU VSHFL¿FDWLRQV DQG SDJHV IRU calculations.
13.
&RQVWUXFWLRQ5RDG6WDELOL]DWLRQ3UDFWLFH $V VRRQ DV ¿QDO JUDGH LV UHDFKHG RQ WKH HQWUDQFH URDG WKH VXEJUDGH ZLOO EH VORSHG WR GUDLQ WR WKH VRXWK DQG VWDELOL]HG ZLWK D LQFK FRXUVH RI 1& '27 VWDQGDUGVL]H$%&VWRQH7KHSDUNLQJDUHDDQGLWVHQWUDQFHURDGZLOODOVREH VWDELOL]HGZLWK$%&VWRQHWRSUHYHQWHURVLRQDQGGXVWGXULQJWKHFRQVWUXFWLRQ RIWKHEXLOGLQJVSULRUWRSDYLQJ6HHSDJHVIRUVSHFL¿FDWLRQV
14.
2XWOHW6WDELOL]DWLRQ6WUXFWXUH3UDFWLFH $ULSUDSDSURQZLOOEHORFDWHGDWWKHRXWOHWRIWKHWKUHHFXOYHUWVWRSUHYHQWVFRXU 6HHSDJHVIRUVSHFL¿FDWLRQVDQGSDJHIRUFDOFXODWLRQV
15.
6XUIDFH5RXJKHQLQJ3UDFWLFH The 3:1 cut slopes will be lightly roughened by disking just prior to vegetating, DQG WKH VXUIDFH WR LQFKHV RI WKH ¿OO VORSHV ZLOO EH OHIW LQ D ORRVH FRQGLWLRQDQGJURRYHGRQWKHFRQWRXU6HHSDJH IRUVSHFL¿FDWLRQV
6XUIDFHVWDELOL]DWLRQZLOOEHDFFRPSOLVKHGZLWKYHJHWDWLRQDQGPXOFKDVVSHFL¿HG LQ WKH YHJHWDWLRQ SODQ 2QH ODUJH RDN WUHH VRXWKZHVW RI %XLOGLQJ $ DQG D EXIIHUDUHDEHWZHHQWKHSDUNLQJORWDQG7HUUL5RDGZLOOEHSUHVHUYHG5RDGZD\ DQG SDUNLQJ ORW EDVH FRXUVHV ZLOO EH LQVWDOOHG DV VRRQ DV ¿QLVKHG JUDGH LV reached. 'XVWFRQWUROLVQRWH[SHFWHGWREHDSUREOHPGXHWRWKHVPDOODUHDRIH[SRVXUH WKH XQGLVWXUEHG SHULPHWHU RI WUHHV DURXQG WKH VLWH DQG WKH UHODWLYHO\ VKRUW WLPHRIH[SRVXUH QRWWRH[FHHG PRQWKV 6KRXOGH[FHVVLYHGXVWEHJHQHUDWHG it will be controlled by sprinkling.
7.7
CONSTRUCTION SCHEDULE 1.
Obtain plan approval and other applicable permits.
)ODJWKHZRUNOLPLWVDQGPDUNWKHRDNWUHHDQGEXIIHUDUHDIRUSURWHFWLRQ +ROGSUHFRQVWUXFWLRQFRQIHUHQFHDWOHDVWRQHZHHNSULRUWRVWDUWLQJ construction. ,QVWDOOVHGLPHQWEDVLQDVWKH¿UVWFRQVWUXFWLRQDFWLYLW\ 5.
Install storm drain with block and gravel inlet protection at construction entrance/exit.
,QVWDOOWHPSRUDU\JUDYHOFRQVWUXFWLRQHQWUDQFHH[LW 7.
Construct temporary diversions above proposed building sites.
Install level
spreader and sediment trap and vegetate disturbed areas. &RPSOHWHVLWHFOHDULQJH[FHSWIRUWKHROGJXOO\FKDQQHOLQWKHQRUWKZHVWSRUWLRQ RIWKHVLWH7KLVDUHDZLOOEHFOHDUHGGXULQJODVWFRQVWUXFWLRQSKDVHIRUWKH LQVWDOODWLRQRIWKHULSUDSFKDQQHOOLQHU &OHDUZDVWHGLVSRVDODUHDLQQRUWKHDVWFRUQHURISURSHUW\RQO\DVQHHGHG 10. Rough grade site, stockpile topsoil, construct channels, install culverts and RXWOHWSURWHFWLRQDQGLQVWDOOVHGLPHQWIHQFHDVQHHGHG0DLQWDLQGLYHUVLRQV DORQJWRSRI¿OOVORSHGDLO\127( $WHPSRUDU\GLYHUVLRQZLOOEHFRQVWUXFWHG DFURVVWKHPLGGOHRIWKHJUDGHGDUHDWRUHGXFHVORSHOHQJWKDQGWKHEDUHDUHDV PXOFKHGVKRXOGJUDGLQJEHGLVFRQWLQXHGIRUPRUHWKDQZHHNV 11. Finish the slopes around buildings as soon as rough grading is complete.
Leave
WKHVXUIDFHVOLJKWO\URXJKHQHGDQGYHJHWDWHDQGPXOFKLPPHGLDWHO\ &RPSOHWH¿QDOJUDGLQJIRUURDGVDQGSDUNLQJDQGVWDELOL]HZLWKJUDYHO &RPSOHWH¿QDOJUDGLQJIRUEXLOGLQJV &RPSOHWH¿QDOJUDGLQJRIJURXQGVWRSVRLOFULWLFDODUHDVDQGSHUPDQHQWO\ vegetate, landscape, and mulch. 15. Install riprap outlet channel and extend riprap to pipe outlet under entrance road. $OOHURVLRQDQGVHGLPHQWFRQWUROSUDFWLFHVZLOOEHLQVSHFWHGZHHNO\DQGDIWHU UDLQIDOOHYHQWV1HHGHGUHSDLUVZLOOEHPDGHLPPHGLDWHO\ $IWHUVLWHLVVWDELOL]HGUHPRYHDOOWHPSRUDU\PHDVXUHVDQGLQVWDOOSHUPDQHQW vegetation on the disturbed areas. (VWLPDWHGWLPHEHIRUH¿QDOVWDELOL]DWLRQ PRQWKV
7.8
MAINTENANCE PLAN $OOHURVLRQDQGVHGLPHQWFRQWUROSUDFWLFHVZLOOEHFKHFNHGIRUVWDELOLW\DQG RSHUDWLRQIROORZLQJHYHU\UXQRIISURGXFLQJUDLQIDOOEXWLQQRFDVHOHVVWKDQ once every week.
Any needed repairs will be made immediately to maintain all
practices as designed. 7KHVHGLPHQWEDVLQZLOOEHFOHDQHGRXWZKHQWKHOHYHORIVHGLPHQWUHDFKHV IWEHORZWKHWRSRIWKHULVHU*UDYHOZLOOEHFOHDQHGRUUHSODFHGZKHQWKH sediment pool no longer drains properly. 6HGLPHQWZLOOEHUHPRYHGIURPWKHVHGLPHQWWUDSDQGEORFNDQGJUDYHOLQOHW SURWHFWLRQGHYLFHZKHQVWRUDJHFDSDFLW\KDVEHHQDSSUR[LPDWHO\¿OOHG Gravel will be cleaned or replaced when the sediment pool no longer drains properly. 6HGLPHQWZLOOEHUHPRYHGIURPEHKLQGWKHVHGLPHQWIHQFHZKHQLWEHFRPHVDERXW IWGHHSDWWKHIHQFH7KHVHGLPHQWIHQFHZLOOEHUHSDLUHGDVQHFHVVDU\WR maintain a barrier. $OOVHHGHGDUHDVZLOOEHIHUWLOL]HGUHVHHGHGDVQHFHVVDU\DQGPXOFKHG DFFRUGLQJWRVSHFL¿FDWLRQVLQWKHYHJHWDWLYHSODQWRPDLQWDLQDYLJRURXVGHQVH vegetative cover.
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VEGETATIVE PLAN Seedbed Preparation (SP) 63 )LOOVORSHV RUVWHHSHUWREHVHHGHGZLWKDK\GUDXOLFVHHGHU SHUPDQHQW seedings) /HDYHWKHODVWLQFKHVRI¿OOORRVHDQGXQFRPSDFWHGDOORZLQJURFNV roots, large clods and other debris to remain on the slope. 5RXJKHQVORSHIDFHVE\PDNLQJJURRYHVLQFKHVGHHSSHUSHQGLFXODUWR the slope. 3)
Spread lime evenly over slopes at rates recommended by soil tests.
63 )LOOVORSHV RUVWHHSHU WHPSRUDU\VHHGLQJV /HDYHDORRVHXQFRPSDFWHGVXUIDFH5HPRYHODUJHFORGVURFNVDQGGHEULV ZKLFKPLJKWKROGQHWWLQJDERYHWKHVXUIDFH 6SUHDGOLPHDQGIHUWLOL]HUHYHQO\DWUDWHVUHFRPPHQGHGE\VRLOWHVWV ,QFRUSRUDWHDPHQGPHQWVE\URXJKHQLQJRUJURRYLQJVRLOVXUIDFHRQWKH contour. 63 +LJKPDLQWHQDQFHWXUI 5HPRYHURFNVDQGGHEULVWKDWFRXOGLQWHUIHUHZLWKWLOODJHDQGWKH SURGXFWLRQRIDXQLIRUPVHHGEHG $SSO\OLPHDQGIHUWLOL]HUDWUDWHVUHFRPPHQGHGE\VRLOWHVWV VSUHDG HYHQO\DQGLQFRUSRUDWHWRDGHSWKRI´ZLWKDIDUPGLVNRUFKLVHOSORZ 3)
Loosen the subgrade immediately prior to spreading topsoil by disking or VFDULI\LQJWRDGHSWKRIDWOHDVWLQFKHV
6SUHDGWRSVRLOWRDGHSWKRILQFKHVDQGFXOWLSDFN 'LVNRUKDUURZDQGUDNHWRSURGXFHDXQLIRUPDQGZHOOSXOYHUL]HGVXUIDFH /RRVHQVXUIDFHMXVWSULRUWRDSSO\LQJVHHG 63 *HQWOHRUÀDWVORSHVZKHUHWRSVRLOLVQRWXVHG 1)
Remove rocks and debris.
$SSO\OLPHDQGIHUWLOL]HUDWUDWHVUHFRPPHQGHGE\VRLOWHVWV VSUHDG HYHQO\DQGLQFRUSRUDWHLQWRWKHWRS´ZLWKDGLVNFKLVHOSORZRUURWDU\ tiller. %UHDNXSODUJHFORGVDQGUDNHLQWRDORRVHXQLIRUPVHHGEHG 5DNHWRORRVHQVXUIDFHMXVWSULRUWRDSSO\LQJVHHG
7.30
Seeding Methods (SM) 60 )LOOVORSHVVWHHSHUWKDQ SHUPDQHQWVHHGLQJV 8VHK\GUDXOLFVHHGLQJHTXLSPHQWWRDSSO\VHHGDQGIHUWLOL]HUDZRRG¿EHU PXOFKDWOEIW 2DQGPXOFKWDFNLIHU 60 *HQWOHWRÀDWVORSHVRUWHPSRUDU\VHHGLQJV 1)
Broadcast seed at the recommended rate with a cyclone seeder, drop spreader, or cultipacker seeder.
2)
Rake seed into the soil and lightly pack to establish good contact.
Mulch (MU) 08 6WHHSVORSHV RUJUHDWHU ,QPLGVXPPHUODWHIDOORUZLQWHUDSSO\OEIW 2 grain straw, cover ZLWKQHWWLQJDQGVWDSOHWRWKHVORSH,QVSULQJRUHDUO\IDOOXVHOE IW 2ZRRG¿EHULQDK\GURVHHGHUVOXUU\ 08 +LJKPDLQWHQDQFHYHJHWDWLRQDQGWHPSRUDU\VHHGLQJV $SSO\ OEIW 2 (4,000 lb/acre) grain straw and tack with 0.1 gal/yd 2 DVSKDOW JDOIW 2). 08 *UDVVOLQHGFKDQQHOV Install excelsior mat in the channel, extend up the channel banks to the KLJKHVWFDOFXODWHGGHSWKRIÀRZDQGVHFXUHDFFRUGLQJWRPDQXIDFWXUHU¶V VSHFL¿FDWLRQV 2QFKDQQHOVKRXOGHUVDSSO\OEIW 2 grain straw and anchor with 0.1 gal/yd 2 JDOIW 2) asphalt. Maintenance (MA) 0$ 5HIHUWLOL]HLQODWHZLQWHURUHDUO\VSULQJWKHIROORZLQJ\HDU0RZDV desired. 0$ .HHSPRZHGWRDKHLJKWRILQFKHV)HUWLOL]HZLWKOEDFUH OE IW 2 QLWURJHQLQZLQWHUDQGDJDLQWKHIROORZLQJIDOO 0$ ,QVSHFWDQGUHSDLUPXOFKDQGOLQLQJ5HIHUWLOL]HLQODWHZLQWHURIWKH IROORZLQJ\HDUZLWKOEDFUH OEIW 2).
Mow regularly to
DKHLJKWRILQFKHV 0$ 7RSGUHVVZLWKIHUWLOL]HULIJURZWKLVQRWIXOO\DGHTXDWH 0$ 7RSGUHVVZLWKOEDFUH OEIW 2 QLWURJHQLQ0DUFK,IFRYHULV QHHGHGWKURXJKWKHIROORZLQJVXPPHURYHUVHHGZLWKOEDFUH.REHOHVSHGH]D
7.31
7.32
Grassed channels with side slopes 3:1
/RZ maintenance areas
Areas requiring FRYHUIRU less than 1 year
3
4
5
3
2
7DOOIHVFXH .REHOHVSHGH]D Bermudagrass 15 German millet 10
Summer
German millet 40 Rye grain 120 .REHOHVSHGH]D
Summer Fall & Winter
120
Rye grain 120 .REHOHVSHGH]D
Rye grain
120
Spring
Winter
7DOOIHVFXH .REHOHVSHGH]D Bahiagrass 25 Rye grain 40
10
7DOOIHVFXH German millet
Summer Spring or Fall
40
7DOOIHVFXH Rye grain
)DOO Spring
Winter
Rye grain
German millet 40 7DOOIHVFXHEOHQG
Summer Fall
Rye grain 120 .REHOHVSHGH]D
Spring
120
Rye grain
Winter
lb/ac
German millet 40
7DOOIHVFXH .REHOHVSHGH]D Bahiagrass 25 Rye grain 40
lb/ac
Summer
Spring or IDOO
Season3
Temporary
63
63
63
63
63
63
Seedbed Preparation
VEGETATIVE PLAN1
60
60
60
60
60
60
Seeding Method
08
08
08
08
08
Mulch
0$
0$
0$
0$
0$
0$
0$
0$
0$
0$
Maintenance
Include topsoil stockpiles here
Treat temporary GLYHUVLRQVDVORZ maintenance, permanent (area 4)
8VHWKHVHVSHFVIRU temporary diversions.
For temporary seeding LQVSULQJRUIDOOVHH 5 below.
7DOOIHVFXHFDQEH VHHGHGLQVSULQJ increase rate to 250 lb/ac. Temp. seeding IRUIDOOLVWKHVDPH DVIRUZLQWHU
Permanent mixture also XVHGIRUORZPDLQW areas (4). Overseed winter plantings RIU\HZLWK.REH OHVSHGH]DLQ0DUFK LIJUDGLQJLVQRW complete.
Notes
6SULQJ )HE$SU 6XPPHU $SU$XJ )DOO $XJ2FW :LQWHU 2FW-DQ
Area numbers are designated on map.
&ROXPQHQWULHVIRUVHHGEHGSUHSDUDWLRQVHHGLQJPHWKRGPXOFKDQGPDLQWHQDQFHUHIHUWR$WWDFKPHQW
+LJK maintenance WXUI
2
1
Steep slopes ORZ maintenance
1
Area No.2 Description
Permanent
Seeding Mixture
TABLE 1:
SUPPORTING CALCULATIONS RUNOFF CALCULATIONS Method: Peak Discharge Method IRU6PDOO:DWHUVKHGV NOTE:
SCS Technical Release No. 55, Urban Hydrology
Other acceptable methods such as Rational Method may also be used.
Calculate peak runoff rate for site during development--Design point outlet at northwest property corner.
6LWHLQIRUPDWLRQ
1.
1)
Site location: South Granville County +\GURORJLFVRLOJURXSIRU&UHHGPRUHVDQG\ORDP & $SSUR[LPDWHK\GUDXOLFOHQJWK IHHW $YHUDJHZDWHUVKHGVORSH DFUHVLQVLWH DFUHVFRQWULEXWLQJUXQRIIWR construction area at outlet in N.W. corner 2IIVLWHUXQRIILQWRSURMHFWDUHD DFUHVZRRGVDQGRSHQ land.
Weighted curve number (CN) (Table 8.03b)
Land Use Newly graded :RRGVRUIRUHVW good cover
Percent
CN 93
Product 58.13
37.5
70
100.0
84.38
Weighted CN = 84.38, use 85.
5DLQIDOO
&DOFXODWH5XQRII'HSWK 7DEOHF 5XQRIIGHSWK 5XQRIIGHSWK
4.
)LJXUHVKDQGM \UKUVWRUP LQ \UKUVWRUP LQ
LQ LQ
Calculate Peak Discharge Rate D 1RDGMXVWPHQWIRUZDWHUVKHGVKDSHLPSHUYLRXVDUHDFKDQQHO LPSURYHPHQWVRUSRQGLQJDUHUHTXLUHG$GMXVWPHQWIRUVORSHZLOO be made. E 3HDNUXQRIIUDWHPRGHUDWHVORSH FIVLQFKRIUXQRIIIURP'$ DFV )LJXUHS F 0XOWLSO\GLVFKDUJHLQFKRIUXQRIIE\UXQRIIGHSWK Q 2,24 FIVLQFKUXQRII[LQ FIV Q10,24 FIVLQFKUXQRII[LQ FIV
7.33
$JUDSKRISHDNGLVFKDUJHUDWHYVDUHDZDVGHYHORSHGIURP )LJXUHVRDQGSWRIDFLOLWDWHWKHGHVLJQRIZDWHUZD\V GLYHUVLRQVDQGRWKHUSUDFWLFHVZKRVHGHVLJQVSHFL¿FDWLRQV DUHEDVHGRQSHDNÀRZVIURPDUHDVOHVVWKDQWKHHQWLUHVLWH (Exhibit 4). G $GMXVWSHDNGLVFKDUJHUDWHIRUDFWXDOZDWHUVKHGVORSH (Table 8.03d): Q 2,24 FIV[ FIV Q10,24 FIV[ FIV H $GGRIIVLWHUXQRIIWKDWZLOOHQWHUVLWHIURPWKHHDVWIURPZRRGV and open land. DFUHV4 10,24 FIV TotalQ 10,24 FIV
7.34
SEDIMENT BASIN DESIGN
$OOUXQRIIIURPVXEZDWHUVKHGVDQG DFUHV ZLOOHQWHUWKHEDVLQ 'HWHUPLQHWKHSHDNÀRZVRIWKH\HDUKRXUVWRUP4 10,24. D 3HDNÀRZ 6HH6KHHW5XQRIIFDOFXODWLRQV 410,24 FIV $GGLQRIIVLWHFRQWULEXWLRQVWKDWPXVWSDVVWKURXJKEDVLQ FIV FIVWRWDO
2.
Determine basin volume: D 0LQLPXPUHTXLUHGVHGLPHQWYROXPH 6WGDQG6SHF 9 IW 3DFUH[ DFUHV IW 3.
'HWHUPLQHVKDSHRIEDVLQ D %\H[DPLQLQJFRQWRXUVRQVLWHPDSEHIRUHFKDQQHOLQVWDOODWLRQRURWKHU PRGL¿FDWLRQ
(OHYDWLRQ IW 338 339 340 341 342 343
$UHD IW2) 3200 5400 9000 11400 13300
'HSWK IW 0.5 1.5 2.5 3.5 4.5 5.5
6WRUDJH IW3) 800 5,100 12,300 32,100 44,450
(OHYDWLRQ\LHOGVIW 3RIVWRUDJHIRUVHGLPHQWPHHWVGHVLJQ requirement.
3ULQFLSDOVSLOOZD\GHVLJQ FPSSLSHVSLOOZD\ IRUWHPSRUDU\EDVLQ 6HWSULQFLSDOVSLOOZD\FUHVWDWWRSRIUHTXLUHGVHGLPHQWSRROHOHY D 7KHPLQLPXPFDSDFLW\RISULQFLSDOVSLOOZD\VKRXOGEHFIVSHUDFUHRI GUDLQDJHDUHD 6WG 6SHFSULQFLSDOVSLOOZD\ Qmin DFUHVDFUHV[FIV aFIV NOTE 'HYHORSHUKDG´FPSLSHDYDLODEOHODUJHUWKDQPLQLPXPSLSHVL]HV DUHSUHIHUUHGZKHQSUDFWLFDOWRUHGXFHIUHTXHQF\RIHPHUJHQF\VSLOOZD\ operation. 3LSHÀRZLVGHWHUPLQHGIRUZDWHUDWWKHFUHVWRIWKHHPHUJHQF\VSLOOZD\IW DERYHWKHULVHULQOHW7DLOZDWHUDVVXPHGDWPLGGOHRISLSH + IW6HHVNHWFK SDJH EDUUHOOHQJWK IW Q pipe FIV[ FIV 7DEOHD Determine riser requirement. PDWFKHV´SLSHEDUUHO
From Figure 8.07b, riser: 21 in. diameter
'HWHUPLQHFDSDFLW\RIFPSULVHU)URP)LJXUHEIRUK IW4 riser = 17 FIV 4 riser > Q pipeSLSHÀRZJRYHUQV
7.35
5.
Emergency Spillway Design
6HWHPHUJHQF\VSLOOZD\HOHYDWLRQIWDERYHSULQFLSDOVSLOOZD\RUHOHY a) Capacity Qe = Q10,244 p Q e FIV FIV FIV SULQFLSDOVSLOOZD\GLVFKDUJH DW+ IW GHVLJQVWDJHIRUHPHUJHQF\VSLOOZD\ÀRZ E 'LPHQVLRQVIRUHDUWKVSLOOZD\IURP7DEOHF6RLOERULQJVLQGLFDWHWKDW VRLORIWKHVSLOOZD\LVUHVLVWDQWWRHURVLRQ NOTE )RUVLWHGHVLUDEOHVWDJHLQVSLOOZD\IW
4 FIV H p IW E IW
8VHIWERWWRP
$GGIWIUHHERDUGPLQLPXP 6HWWRSRIGDPIWDERYHGHVLJQVWDJHRIHPHUJHQF\VSLOOZD\RUHOHY c) Antiseep collars QRWFORVHUWKDQIHHWWRDSLSHMRLQW FROODU¶[¶ 6WG 6SHFVHGLPHQWEDVLQ
$QFKRUSULQFLSDOVSLOOZD\ 'RZQZDUGIRUFH [XSZDUGIRUFH 5HTXLUHGQHW[IW[ LQFKHVLQFKHVIW 2[[OEIW 3 = 1078 lb 4 Use concrete 1 IW 3 or approx. 1/2 yd 3 = 1140 lbs. 1
7.
8VHEXR\DQWZHLJKWRIFRQFUHWHIRUQHWGRZQZDUGIRUFHLWH[HUWV
Dewatering the basin: 3HUIRUDWHWKHULVHUZLWKóWRòLQFKKROHVVSDFHGLQFKHVDSDUW&RYHUWKH SHUIRUDWHGVHFWLRQZLWKDôLQFKJUDYHO¿OWHUIHHWWKLFN
7UDVKJXDUGWREH¿UPO\IDVWHQHGWRWKHWRSRIWKHULVHU
9.
Embankment design: IRRWWRSZLGWK VLGHVORSHVVHWWOHGWRSHOHYDWLRQ &RQVWUXFWHGWRSHOHYDWLRQIW VHWWOHPHQW DWFHQWHU grading to 344.5 at abutments. )URPVRLOERULQJVFXWRIIWUHQFKVKRXOGEHH[FDYDWHGLQWRWKHWLJKWJUD\ VXEVRLO7UHQFKGLPHQVLRQVWRIWGHHS IWZLGHZLWK VLGH slopes.
7.36
GRASS LINED CHANNELS Procedure given in Appendices 8.05 used in design. 1.
Channel #1 $OWKRXJKFKDQQHOUHFHLYHVÀRZIURPFKDQQHOPLGZD\LQLWVOHQJWKLWZLOO EHGHVLJQHGDVDVLQJOHUHDFKLQVWHDGRIVHSDUDWHUHDFKHV7KHÀRZLQWKH XSSHUUHDFKZLOOEHFRQVLGHUDEO\OHVVWKDQWKHGHVLJQÀRZEXWIRUFRQVLVWHQF\ in dimensions, grade, and appearance the upper reach will not be designed VHSDUDWHO\)LQDOGHVLJQLVEDVHGRQWKHUHPRYDORIWKHWHPSRUDU\GLYHUVLRQV D (VWLPDWHGUDLQDJHDUHDDQGGHWHUPLQHSHDNÀRZLQWRFKDQQHO Area = 1.9 acre $YHUDJHVORSHRIGUDLQDJHDUHD Q 10,24 FIV ([KLELW 2IIVLWHFRQWULEXWLRQV )ORZIURPFKDQQHO FIV For design purpose Q 10,24 FIVFIV FIV E 3URSRVHGFKDQQHOJUDGH c) Proposed vegetation: Tall Fescue d) Soil: Creedmore (easily erodible) e) Permissible velocity: (V p IWV 7DEOHD I 5HWDUGDQFHFODVV ³%´XQPRZHG³'´PRZHG 7DEOHF J 7UDSH]RLGDO&KDQQHOGLPHQVLRQV GHVLJQLQJIRUORZUHWDUGDQFHFRQGLWLRQ UHWDUGDQFHFODVV' GHVLJQWRPHHW Vp $ 49 FIVIWVHF IW 2 7U\ERWWRPZLGWK IW Z = 3 A = bd + Zd 2 3 EG] 2+1 An iterative solution using Figure 8.05c to relate hydraulic radius depth WR0DQQLQJ¶VQSURFHHGVDVIROORZV 0DQQLQJ¶VHTXDWLRQLVXVHGWRFKHFN velocities.
7.37
G IW $ IW2) 5 IW
n
9 ISV 4 FIV
0.8
4.32
0.54
0.043
3.25
14.0
0.9
5.13
0.59
0.042
3.53
18.1
Comments V Q22. V >Vp, needs protection
9HORFLW\!ISVFKDQQHOUHTXLUHVWHPSRUDU\OLQHU L &DOFXODWHVKHDUVWUHVVIRU4 2 7 7
\GV ZKHUH
\ XQLWZHLJKWRIZDWHU OEIW 3) G ÀRZGHSWK IW V FKDQQHOJUDGLHQW IWIW
OEIW 2
)LEHUJODVVURYLQJLVDQDFFHSWDEOHOLQLQJ KRZHYHUXVHVWUDZZLWKQHWWR SURYLGHDGGLWLRQDOSURWHFWLRQDVZHOODVPXOFKIRUVHHGLQJQ 7DEOHH 7 d = 1.45 (Table 8.05g)
7.38
b IW G IW $ IW2) 5 IW 9 ISV 4 FIV 7 OEVIW2) 3 2.88 0.42 10.3 0.75
Comments TQ22. where Td = allowable shear stress
Channel Summary: 7UDSH]RLGDOVKDSH] E IWG IWJUDGH Temporary liner: straw with net
2.
Channel #3 &KDQQHOGHVLJQFDSDFLW\WRLQFOXGHÀRZWKDWZLOOEHGLYHUWHGIURPVRXWKGXULQJ construction because diversion may be removed when construction is complete. D
(VWLPDWHGUDLQDJHDUHDDQGGHWHUPLQHSHDNÀRZVLQGLWFK $UHDaDFUHV $YJVORSHRIGUDLQDJHDUHD Q 10,24 FIV ([KLELW 2IIVLWHFRQWULEXWLRQ QRQH
E c) d) H I J
3URSRVHGFKDQQHOJUDGH Proposed vegetative cover: Tall Fescue Soil: Creedmore (easily erodible) 3HUPLVVLEOHYHORFLW\IRUHVWDEOLVKHGYHJHWDWLRQ IWV 7DEOHD 5HWDUGDQFHFODVV³%´XQPRZHG³'´PRZHG 7DEOHF 7UDSH]RLGDO&KDQQHO ]
By the same method as channel #1:
Description cut (D)
E IW 3.0
uncut (B)
3.0
h)
G IW $ IW2) 5 IW 1.2 7.42 0.748 1.7
13.77
1.00
9 ISV 2.7 1.0
Q (cps) Comments 21.1 Q > Q10, V < Vp 13.8
Q > Q10
Evaluate Temporary Liner Requirements: 'HWHUPLQHYHORFLW\DQGGHSWKRIÀRZIRU\UKUVWRUP%HFDXVHWKH channel will be protected by a temporary diversion, the drainage area FRQWULEXWLQJWKHÀRZGXULQJFRQVWUXFWLRQLVUHGXFHGWRDFUH4 2,24 = 3.7 FIV 8VLQJ0DQQLQJ¶VHTXDWLRQZLWK³Q´ 7DEOHE
G IW 0.32
A IW2) 1.27
5 IW 0.25
9 ISV
4 FIV
Comments Q>Q2, V>Vp, needs protection
9HORFLW\!ISVLVH[FHVVLYHIRUEDUHVRLOFRQGLWLRQVUHTXLUHVWHPSRUDU\ liner. i.
Calculate shear stress in channel at depth associated with Q 2,24. 7 \GV OEIW 2 -XWHQHWLVDQDFFHSWDEOHWHPSRUDU\OLQHU 7DEOHJ KRZHYHUVWUDZZLWK net will SURYLGHDGGLWLRQDOSURWHFWLRQDVZHOODVPXOFKIRUVHHGLQJ
7.39
Channel #3 Summary: 7UDSH]RLGDOFKDQQHO] E IWG IWJUDGH Temporary liner: straw with net
3.
Channel #2 D
(VWLPDWHGUDLQDJHDUHDDQGGHWHUPLQHSHDNÀRZVLQWRFKDQQHO Area = 0.8 acres $YHUDJHVORSHRIGUDLQDJHDUHDa PRGHUDWH Q10,24 FIV ([KLELW 2IIVLWHFRQWULEXWLRQ 1RQH Because diversion will protect entire channel during construction, overland ÀRZFRQWULEXWLQJWR4 2,24SHDNÀRZZLOOEHQHJOLJLEOH Q10,24 FIV
E c) d) H I J
3URSRVHGFKDQQHOJUDGH Proposed vegetative cover = Tall Fescue Soil: Creedmore (easily erodible) 3HUPLVVLEOHYHORFLW\ IWV 7DEOHD 5HWDUGDQFHFODVV ³%´XQPRZHG³'´PRZHG 7DEOHF 7UDSH]RLGDOFKDQQHOE IW]
Description E IW cut (D) 2.0 uncut (B) 2.0
d IW 1.0 1.4
$ IW2) 5 IW 4 FIV 9 ISV 5.00 14.5 2.90 0.80 8.19 0.94
h) Evaluate temporary liner requirements:
Comments Q > Q10, V < Vp Q > Q10
Not necessary, negligible Q2ÀRZ
Channel #2 Summary: 7UDSH]RLGDOFKDQQHO E IW] G IWJUDGH Temporary liner: none required. 6WUDZPXOFKWDFNHGZLWKDVSKDOWFRXOGEHXVHGWRIDFLOLWDWHYHJHWDWLYH establishment. However, since all other channels need temporary liner (mulch ZLWKQHWWLQJ XVHWKHVDPHPDWHULDOVIRUFKDQQHO
4.
Channel #4 D
(VWLPDWHGUDLQDJHDUHDDQGGHWHUPLQHSHDNÀRZLQWRGLWFK Area = 0.75 acre $YHUDJHVORSHRIGUDLQDJHDUHD Q10,24 FIV ([KLELW
E F d) H
7.40
3URSRVHGFKDQQHOJUDGH 3URSRVHGYHJHWDWLYHFRYHU 7DOOIHVFXH Soil: Creedmore (easily erodible) 3HUPLVVLEOHYHORFLW\ IWV 7DEOHD
I 5HWDUGDQFH&ODVV ³%´XQPRZHG³'´PRZHG 7DEOHF J 7UDSH]RLGDOFKDQQHOGLPHQVLRQV ] By same method as channel #1:
Description cut (D)
E IW 2.0
G IW 1.00
$ IW2) 5.00
uncut (B)
2.0
1.7
12.1
h)
R IW 9 ISV Q (cps) 1.95 9.75
Comments Q>Q10, Vp2.
Q>Q102.
0.95
7.3
Evaluate temporary liner requirements: 8VLQJ0DQQLQJ¶VHTXDWLRQZLWK³Q´ 7DEOHE Q 2,24 FIV
G IW 0.35
$ IW2) 1.07
5 IW 9 ISV 4 FIV Comments 0.25 3.10 3.32 Q>Q2, V>Vp, needs protection
9HORFLW\!ISV UHTXLUHVWHPSRUDU\OLQHU L
&DOFXODWHVKHDUVWUHVVIRU4 2,24 conditions. 7 \GV OEIW 2 -XWHQHWLVDQDSSURSULDWHWHPSRUDU\FKDQQHOOLQHU 7DEOHH KRZHYHU VWUDZZLWKQHWZLOOSURYLGHPRUHHURVLRQSURWHFWLRQEHWWHUPXOFKIRU seeding, and will be consistent with channels #1 and #3.
&KDQQHO6XPPDU\ ] E G IWJUDGH Temporary liner: straw with net 1
NOTE
)RUXQLIRUPLW\RIFRQVWUXFWLRQPDNHFKDQQHOERWWRP¶ZLGHVDPHDVDOO other channels even though design only requires a 2.0’ bottom width.
RIPRAP CHANNELS D (VWLPDWHRQVLWHGLUHFWUXQRIIIURPGUDLQDJHDUHDDQGFDOFXODWHSHDNÀRZ DGGÀRZIURPFKDQQHOV Area = 3.74 acres $YHUDJHVORSHRIGUDLQDJHDUHD PRGHUDWH Q 10,24 FIV ([KLELW
Channels 2 1 4
Q10,24 FIV FIV FIV FIV
2WKHUÀRZFRQWULEXWLRQV 2IIVLWHFRQWULEXWLRQ FIV 'HVLJQÀRZ 4 10,24 FIVFIVFIV FIV
7.41
E 3URSRVHGFKDQQHOJUDGH c) Proposed liner: riprap G 7UDSH]RLGDOFKDQQHOLVGHVLJQHGZLWKFDSDFLW\WRPHHWGHVLJQÀRZ5LSUDS OLQHUUHTXLUHPHQWVDUHWKHQDQDO\]HG)LUVWHVWLPDWHDWULDOULSUDSVL]HRI LQFKHV)RUÀRZRIWKHH[SHFWHGGHSWKUDQJHRIWRIWQ 7DEOH I DQG7 d 7DEOHJ ] Channel dimensions:
E IW G IW 1.2 e)
$ IW2) 10.1
n 0.044
S
9 ISV
4 FIV 77.3
Determine riprap requirements 7 \GV ZKHUH \ XQLWZHLJKWRIZDWHU OEIW 3) G ÀRZGHSWK IW V FKDQQHOJUDGLHQW IWIW Since T d 7VHOHFWDODUJHUVWRQHVL]HDQGDODUJHUERWWRPZLGWK7U\E IWG 50, = 12 in. From Table 8.05g T d IURP7DEOHIQ
E IW G IW $ IW2) 8 1.2 12.48
5 IW 0.93
4 FIV 72.3
7 OEIW2) 4.5
Comment Q>Q10, T
7 6DPSOH(URVLRQDQG 6HGLPHQWDWLRQ&RQWURO3ODQ
Attached is a sample erosion and sedimentation control plan based on one IURPWKH¿OHVRIWKHVWDWHRI1RUWK&DUROLQD7KHVLWHLVORFDWHGLQWKH3LHGPRQW UHJLRQ7KHSODQZDVPRGL¿HGWRGHPRQVWUDWHWKHDSSOLFDWLRQRIDYDULHW\RI HURVLRQDQGVHGLPHQWDWLRQFRQWUROSUDFWLFHVFRPPRQO\XVHGWKURXJKRXWWKH 6WDWH This sample plan was developed in detail for instructive purposes. The VSHFL¿FQXPEHURIPDSVSUDFWLFHVGUDZLQJVVSHFL¿FDWLRQVDQGFDOFXODWLRQV UHTXLUHGGHSHQGVRQWKHVL]HDQGFRPSOH[LW\RIWKHGHYHORSPHQW7KHGHVLJQHU should select the most practical and effective practices to control erosion and SUHYHQW VHGLPHQW IURP OHDYLQJ WKH VLWH 7KH SODQ VKRXOG EH RUJDQL]HG DQG SUHVHQWHG LQ D FOHDU FRQFLVH PDQQHU 6XI¿FLHQW GHVLJQ DQG EDFNJURXQG LQ formation should be included to facilitate review by erosion control personnel. Construction details should be precise and clear for use by an experience JHQHUDOFRQWUDFWRU $QDFFHSWDEOHHURVLRQDQGVHGLPHQWDWLRQFRQWUROSODQPXVWFRQWDLQ 1. brief narrative FRQVWUXFWLRQVFKHGXOH 3. maintenance plan YLFLQLW\PDS VLWHWRSRJUDSKLFPDS 6. site development plan HURVLRQDQGVHGLPHQWDWLRQFRQWUROSODQGUDZLQJ GHWDLOGUDZLQJVDQGVSHFL¿FDWLRQV YHJHWDWLYHSODQ VXSSRUWLQJFDOFXODWLRQV ¿QDQFLDOUHVSRQVLELOLW\RZQHUVKLSIRUP FKHFNOLVW
7.1
7.2
SAMPLE EROSION AND SEDIMENTATION CONTROL PLAN ABC INDUSTRIES, INC. DEAL, N.C. SEPTEMBER 1988
TABLE OF CONTENTS Page Narrative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.4 Construction Schedule . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.8 Maintenance Plan. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.9 Vicinity Map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.9 Site Topographic Map. . . . . . . . . . . . . . . . . . . . . . . . . Exhibit 1 Site Development Plan . . . . . . . . . . . . . . . . . . . . . . . . Exhibit 2 Site Erosion and Sedimentation Control Plan . . . . . . . . . . . . . Exhibit 3 'HWDLO'UDZLQJVDQG6SHFL¿FDWLRQVIRU3UDFWLFHV6SHFL¿HG. . . . . . . . . . 7.11 Vegetation Plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.30 Supporting Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . 7.33 Financial Responsibility/Ownership Form . . . . . . . . . . . . . . . . . . 7.51 Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.53
7.3
NARRATIVE Project Description
7KH SXUSRVH RI WKH SURMHFW LV WR FRQVWUXFW WZR ODUJH FRPPHUFLDO EXLOGLQJV
with associated paved roads and parking area.
Another building will be added in the
IXWXUH$SSUR[LPDWHO\DFUHVZLOOEHGLVWXUEHGGXULQJWKLVFRQVWUXFWLRQSHULRG7KH VLWHLVDFUHVORFDWHGLQ*UDQYLOOHFRXQW\PLOHVQRUWKRI'HDO1&RII7HUUL Road (see Vicinity Map). Site Description
7KHVLWHKDVUROOLQJWRSRJUDSK\ZLWKVORSHVJHQHUDOO\WR6ORSHVVWHHSHQ
WR WR LQ WKH QRUWKZHVW SRUWLRQ RI WKH SURSHUW\ ZKHUH D VPDOO KHDOHGRYHU JXOO\VHUYHVDVWKHSULQFLSDOGUDLQDJHZD\IRUWKHVLWH7KHVLWHLVQRZFRYHUHGZLWK YROXQWHHUKHDY\ZRRG\YHJHWDWLRQSUHGRPLQDQWO\SLQHVWRIWKLJK7KHUHLVQR HYLGHQFHRIVLJQL¿FDQWHURVLRQXQGHUSUHVHQWVLWHFRQGLWLRQV7KHROGGUDLQDJHJXOO\ LQGLFDWHVVHYHUHHURVLRQSRWHQWLDODQGUHFHLYHVÀRZIURPDFUHVRIZRRGVRIIVLWH 7KHUHLVRQHODUJHRDNWUHHORFDWHGLQWKHZHVWHUQFHQWUDOSRUWLRQRIWKHSURSHUW\ DQGDEXIIHUDUHDIURQWLQJ7HUUL5RDGWKDWZLOOEHSURWHFWHGGXULQJFRQVWUXFWLRQ Adjacent Property Land use in the vicinity is commercial/industrial.
The land immediately to the
ZHVW DQG VRXWK KDV EHHQ GHYHORSHG IRU LQGXVWULDO XVH $UHDV WR WKH QRUWK DQG HDVW are undeveloped and heavily wooded, primarily in volunteer pine.
Hocutt Creek, the
RIIVLWH RXWOHW IRU UXQRII GLVFKDUJH LV SUHVHQWO\ D ZHOOVWDELOL]HG JHQWO\ÀRZLQJ perennial stream.
Sediment control measures will be taken to prevent damage to Hocutt
&UHHN$SSUR[LPDWHO\DFUHVRIZRRGHGDUHDWRWKHHDVWFRQWULEXWHUXQRIILQWRWKH construction area. Soils The soil in the project area is mapped as Creedmore sandy loam in B and C slope classes.
Creedmoor soils are considered moderately well to somewhat poorly drained
ZLWKSHUPHDELOLW\UDWHVJUHDWHUWKDQLQFKHVKRXUDWWKHVXUIDFHEXWOHVVWKDQ LQFKHVKRXULQWKHVXEVRLO7KHVXEVXUIDFHLVSDOHEURZQVDQG\ORDPLQFKHVWKLFN 7KHVXEVRLOFRQVLVWVRIDSDOHEURZQDQGEURZQLVK\HOORZVDQG\FOD\ORDPUDQJLQJWR OLJKWJUD\FOD\LQFKHVWKLFN%HORZLQFKHVLVDOD\HURI¿QHVDQG\ORDPWR LQFKHV7KHVRLOHURGLELOLW\IDFWRU .YDOXH UDQJHVIURPDWWKHVXUIDFHWR in the subsoil. 'XH WR WKH VORZ SHUPHDELOLW\ RI WKH VXEVRLO WKDW ZLOO EH H[SRVHG GXULQJ JUDGLQJ D VXUIDFHZHWQHVVSUREOHPZLWKKLJKUXQRIILVDQWLFLSDWHGIROORZLQJVLJQL¿FDQWUDLQIDOO events.
No groundwater problem is expected.
The tight clay in the subsoil will make
YHJHWDWLRQGLI¿FXOWWRHVWDEOLVK$VPDOODPRXQWRIWRSVRLOH[LVWVRQVLWHDQGZLOO EHVWRFNSLOHGIRUXVHLQODQGVFDSLQJ
7.4
Planned Erosion and Sedimentation Control Practices 1.
6HGLPHQW%DVLQ3UDFWLFH $VHGLPHQWEDVLQZLOOEHFRQVWUXFWHGLQWKHQRUWKZHVWFRUQHURIWKHSURSHUW\ $OO ZDWHU IURP GLVWXUEHG DUHDV DERXW DFUHV ZLOO EH GLUHFWHG WR WKH EDVLQ EHIRUHOHDYLQJWKHVLWH NOTE:
The undisturbed areas to the east and north
could have been diverted, but this was not proposed because it would have required clearing to the property line to build the diversion and the required RXWOHWVWUXFWXUH 6HHSDJHVIRUGHWDLOVDQGSDJHVIRU supporting calculations. 2.
Temporary Gravel Construction Entrance/E[LW3UDFWLFH $WHPSRUDU\JUDYHOFRQVWUXFWLRQHQWUDQFHZLOOEHLQVWDOOHGQHDUWKHQRUWKZHVW FRUQHURIWKHSURSHUW\'XULQJZHWZHDWKHULWPD\EHQHFHVVDU\WRZDVKYHKLFOH WLUHVDWWKLVORFDWLRQ7KHHQWUDQFHZLOOEHJUDGHGVRWKDWUXQRIIZDWHUZLOO EHGLUHFWHGWRDQLQOHWSURWHFWLRQVWUXFWXUHDQGDZD\IURPWKHVWHHS¿OODUHD WRWKHQRUWK6HHSDJHIRUVSHFL¿FDWLRQV
3.
7HPSRUDU\%ORFNDQG*UDYHO'URS,QOHW3URWHFWLRQ3UDFWLFH A temporary block and gravel drop inlet protection device will be installed at WKHGURSLQOHWORFDWHGRQWKHVRXWKVLGHRIWKHFRQVWUXFWLRQHQWUDQFH5XQRII IURPWKHGHYLFHZLOOEHGLUHFWHGLQWRWKHVHGLPHQWEDVLQ NOTE:
The presence
RI WKLV GHYLFH UHGXFHV WKH VHGLPHQW ORDG RQ WKH VHGLPHQW EDVLQ DQG SURYLGHV VHGLPHQWSURWHFWLRQIRUWKHSLSH,QDGGLWLRQVHGLPHQWUHPRYDODWWKLVSRLQW LVPRUHFRQYHQLHQWWKDQIURPWKHEDVLQ 6HHSDJHIRUVSHFL¿FDWLRQV 4.
7HPSRUDU\'LYHUVLRQV3UDFWLFH 7HPSRUDU\ GLYHUVLRQV ZLOO EH FRQVWUXFWHG DERYH WKH FXW VORSHV VRXWK RI %XLOGLQJV$DQG%WRSUHYHQWVXUIDFHUXQRIIIURPHURGLQJWKHVHEDQNV NOTE: 6HGLPHQWIUHHZDWHUPD\EHGLYHUWHGDZD\IURPWKHSURMHFWVHGLPHQWEDVLQ $ WHPSRUDU\GLYHUVLRQZLOOEHFRQVWUXFWHGQHDUWKHPLGGOHRIWKHGLVWXUEHGDUHD to break up this long, potentially erosive slope should the grading operation be temporarily discontinued.
A temporary diversion will be constructed along
WKHWRSHGJHRIWKH¿OOVORSHDWWKHHQGRIHDFKGD\GXULQJWKH¿OOLQJRSHUDWLRQ WRSURWHFWWKH¿OOVORSH7KLVWHPSRUDU\GLYHUVLRQZLOORXWOHWWRWKHH[LVWLQJ XQGLVWXUEHG FKDQQHO QHDU WKH QRUWK HGJH RI WKH FRQVWUXFWLRQ VLWH DQGRU WR WKHWHPSRUDU\LQOHWSURWHFWLRQGHYLFHDWWKHFRQVWUXFWLRQHQWUDQFHDVWKH¿OO HOHYDWLRQLQFUHDVHV6HHSDJHIRUVSHFL¿FDWLRQVDQGSDJHV IRU supporting calculations. 5.
/HYHO6SUHDGHU3UDFWLFH $ OHYHO VSUHDGHU ZLOO VHUYH DV WKH RXWOHW IRU WKH GLYHUVLRQ HDVW RI %XLOGLQJ $ DQG VRXWK RI %XLOGLQJ % 7KH DUHD EHORZ WKH VSUHDGHU LV UHODWLYHO\ VPRRWK DQG KHDYLO\ YHJHWDWHG ZLWK D VORSH RI DSSUR[LPDWHO\ 6HH SDJH IRU VSHFL¿FDWLRQV
7UHH3UHVHUYDWLRQDQG3URWHFWLRQ3UDFWLFH $PLQLPXPIWKLJKSURWHFWLYHIHQFHZLOOEHHUHFWHGDURXQGWKHODUJHRDNWUHH DWWKHGULSOLQHWRSUHYHQWGDPDJHGXULQJFRQVWUXFWLRQ6HGLPHQWIHQFHPDWHULDOV
7.5
PD\EHXVHGIRUWKLVSXUSRVH6HHSDJHIRUVSHFL¿FDWLRQV 7.
/DQG*UDGLQJ3UDFWLFH +HDY\JUDGLQJZLOOEHUHTXLUHGRQDSSUR[LPDWHO\DFUHV7KHÀDWWHUVORSHDIWHU JUDGLQJZLOOUHGXFHWKHRYHUDOOHURVLRQSRWHQWLDORIWKHVLWH7KHEXLOGLQJV will be located on the higher cut areas, and the access road and open landscaped DUHDVZLOOEHORFDWHGRQ¿OODUHDV6HHSDJHVIRUVSHFL¿FDWLRQV $OOFXWVORSHVZLOOEH RUÀDWWHUWRDYRLGLQVWDELOLW\GXHWRZHWQHVVSURYLGH ¿OOPDWHULDOJLYHDQRSHQDUHDDURXQGWKHEXLOGLQJVDQGDOORZYHJHWDWHGVORSHV WREHPRZHG&XWVORSHVZLOOEH¿QHJUDGHGLPPHGLDWHO\DIWHUURXJKJUDGLQJ WKH VXUIDFH ZLOO EH GLVNHG DQG YHJHWDWHG DFFRUGLQJ WR WKH 9HJHWDWLRQ 3ODQ SDJHV )LOOVORSHVZLOOEH ZLWK¿OOGHSWKVDVPXFKDVWRIW)LOOZLOOEH placed in layers not to exceed 9 inches in depth and compacted.
(NOTE:
Fills
RI WKLV GHSWK VKRXOG KDYH GHWDLOHG FRPSDFWLRQ VSHFL¿FDWLRQV LQ WKH JHQHUDO FRQVWUXFWLRQ FRQWUDFW 7KHVH VSHFL¿FDWLRQV DUH QRW SDUW RI WKH HURVLRQ DQG sedimentation control plan.) 7KH¿OOVORSHLQWKHQRUWKSRUWLRQRIWKHSURSHUW\LVWKHPRVWYXOQHUDEOHDUHD WRHURVLRQRQWKHVLWH7HPSRUDU\GLYHUVLRQVZLOOEHPDLQWDLQHGDWWKHWRSRI WKLV¿OOVORSHDWDOOWLPHVDQGWKH¿OOLQJRSHUDWLRQZLOOEHJUDGHGWRSUHYHQW RYHUÀRZ WR WKH QRUWK )LOOLQJ ZLOO EH GRQH DV D FRQWLQXRXV RSHUDWLRQ XQWLO ¿QDOJUDGHLVUHDFKHG7KHSDYHGURDGORFDWHGRQWKH¿OOZLOOEHVORSHGWRWKH VRXWK DQG ZLOO IXQFWLRQ DV D SHUPDQHQW GLYHUVLRQ 7KH DUHD DGMDFHQW WR WKH URDGVDQGSDUNLQJDUHDZLOOEHJUDGHGWRFRQGXFWUXQRIIWRWKHURDGFXOYHUWV 5XQRIIZDWHUIURPWKHEXLOGLQJVZLOOEHJXWWHUHGWRWKHYHJHWDWHGFKDQQHOV7KH ¿QLVKHGVORSHIDFHWRWKHQRUWKZLOOQRWEHEDFNEODGHG7KHWRSWRLQFKHV ZLOOEHOHIWLQDORRVHDQGURXJKHQHGFRQGLWLRQ3ODQWLQJVZLOOEHSURWHFWHG ZLWKPXOFKDVVSHFL¿HGLQWKH9HJHWDWLRQ3ODQ $PLQLPXPIWXQGLVWXUEHGEXIIHU]RQHZLOOEHPDLQWDLQHGDURXQGWKHSHULPHWHU RI WKH GLVWXUEHG DUHD 127( 7KLV ZLOO UHGXFH ZDWHU DQG ZLQG HURVLRQ KHOS FRQWDLQVHGLPHQWUHGXFHGXVWDQGUHGXFH¿QDOODQGVFDSLQJFRVWV 8.
7HPSRUDU\6HGLPHQW7UDS3UDFWLFH $VPDOOVHGLPHQWWUDSZLOOEHFRQVWUXFWHGDWWKHLQWHUVHFWLRQRIWKHH[LVWLQJ road ditch and channel number 3 to protect the road ditch.
Approximately 2
DFUHVRIGLVWXUEHGDUHDZLOOGUDLQLQWRWKLVWUDS6HHSDJHV IRU VSHFL¿FDWLRQVDQGSDJHV IRUFDOFXODWLRQV 9.
6HGLPHQW)HQFH3UDFWLFH $VHGLPHQWIHQFHZLOOEHFRQVWUXFWHGDURXQGWKHWRSVRLOVWRFNSLOHDQGDORQJWKH FKDQQHOEHUPDGMDFHQWWRWKHGHHSFXWDUHDDVQHFHVVDU\WRSUHYHQWVHGLPHQWIURP HQWHULQJWKHFKDQQHOV6HHSDJHIRUVSHFL¿FDWLRQV
10.
6RG'URS,QOHW3URWHFWLRQ3UDFWLFH Permanent sod drop inlet protection will replace the temporary block and gravel
7.6
structure when the contributing drainage area has been permanently seeded and PXOFKHG6HHSDJHVIRUVSHFL¿FDWLRQV 11.
*UDVV/LQHG&KDQQHO3UDFWLFH *UDVVOLQHGFKDQQHOVZLWKWHPSRUDU\VWUDZQHWOLQHUVZLOOEHFRQVWUXFWHGDURXQG Buildings A and B to collect and convey site water to the project’s sediment EDVLQ 6HH SDJHV IRU VSHFL¿FDWLRQV DQG SDJHV IRU calculations. 6KRXOGWKHGLVWXUEHGDUHDVDGMRLQLQJWKHFKDQQHOVQRWEHVWDELOL]HGDWWKHWLPH WKHFKDQQHOVDUHYHJHWDWHGDVHGLPHQWIHQFHZLOOEHLQVWDOOHGDGMDFHQWWRWKH channel to prevent channel siltation.
12.
5LSUDS/LQHGDQG3DYHG&KDQQHOV3UDFWLFH $ULSUDSFKDQQHOZLOOEHFRQVWUXFWHGLQWKHROGJXOO\DORQJWKHQRUWKVLGHRI WKHSURSHUW\VWDUWLQJLQWKHQRUWKZHVWFRUQHUDIWHUDOORWKHUFRQVWUXFWLRQLV FRPSOHWH7KLVFKDQQHOZLOOUHSODFHWKHROGJXOO\DVWKHSULQFLSDORXWOHWIURP WKH VLWH 6HH SDJHV IRU VSHFL¿FDWLRQV DQG SDJHV IRU calculations.
13.
&RQVWUXFWLRQ5RDG6WDELOL]DWLRQ3UDFWLFH $V VRRQ DV ¿QDO JUDGH LV UHDFKHG RQ WKH HQWUDQFH URDG WKH VXEJUDGH ZLOO EH VORSHG WR GUDLQ WR WKH VRXWK DQG VWDELOL]HG ZLWK D LQFK FRXUVH RI 1& '27 VWDQGDUGVL]H$%&VWRQH7KHSDUNLQJDUHDDQGLWVHQWUDQFHURDGZLOODOVREH VWDELOL]HGZLWK$%&VWRQHWRSUHYHQWHURVLRQDQGGXVWGXULQJWKHFRQVWUXFWLRQ RIWKHEXLOGLQJVSULRUWRSDYLQJ6HHSDJHVIRUVSHFL¿FDWLRQV
14.
2XWOHW6WDELOL]DWLRQ6WUXFWXUH3UDFWLFH $ULSUDSDSURQZLOOEHORFDWHGDWWKHRXWOHWRIWKHWKUHHFXOYHUWVWRSUHYHQWVFRXU 6HHSDJHVIRUVSHFL¿FDWLRQVDQGSDJHIRUFDOFXODWLRQV
15.
6XUIDFH5RXJKHQLQJ3UDFWLFH The 3:1 cut slopes will be lightly roughened by disking just prior to vegetating, DQG WKH VXUIDFH WR LQFKHV RI WKH ¿OO VORSHV ZLOO EH OHIW LQ D ORRVH FRQGLWLRQDQGJURRYHGRQWKHFRQWRXU6HHSDJH IRUVSHFL¿FDWLRQV
6XUIDFHVWDELOL]DWLRQZLOOEHDFFRPSOLVKHGZLWKYHJHWDWLRQDQGPXOFKDVVSHFL¿HG LQ WKH YHJHWDWLRQ SODQ 2QH ODUJH RDN WUHH VRXWKZHVW RI %XLOGLQJ $ DQG D EXIIHUDUHDEHWZHHQWKHSDUNLQJORWDQG7HUUL5RDGZLOOEHSUHVHUYHG5RDGZD\ DQG SDUNLQJ ORW EDVH FRXUVHV ZLOO EH LQVWDOOHG DV VRRQ DV ¿QLVKHG JUDGH LV reached. 'XVWFRQWUROLVQRWH[SHFWHGWREHDSUREOHPGXHWRWKHVPDOODUHDRIH[SRVXUH WKH XQGLVWXUEHG SHULPHWHU RI WUHHV DURXQG WKH VLWH DQG WKH UHODWLYHO\ VKRUW WLPHRIH[SRVXUH QRWWRH[FHHG PRQWKV 6KRXOGH[FHVVLYHGXVWEHJHQHUDWHG it will be controlled by sprinkling.
7.7
CONSTRUCTION SCHEDULE 1.
Obtain plan approval and other applicable permits.
)ODJWKHZRUNOLPLWVDQGPDUNWKHRDNWUHHDQGEXIIHUDUHDIRUSURWHFWLRQ +ROGSUHFRQVWUXFWLRQFRQIHUHQFHDWOHDVWRQHZHHNSULRUWRVWDUWLQJ construction. ,QVWDOOVHGLPHQWEDVLQDVWKH¿UVWFRQVWUXFWLRQDFWLYLW\ 5.
Install storm drain with block and gravel inlet protection at construction entrance/exit.
,QVWDOOWHPSRUDU\JUDYHOFRQVWUXFWLRQHQWUDQFHH[LW 7.
Construct temporary diversions above proposed building sites.
Install level
spreader and sediment trap and vegetate disturbed areas. &RPSOHWHVLWHFOHDULQJH[FHSWIRUWKHROGJXOO\FKDQQHOLQWKHQRUWKZHVWSRUWLRQ RIWKHVLWH7KLVDUHDZLOOEHFOHDUHGGXULQJODVWFRQVWUXFWLRQSKDVHIRUWKH LQVWDOODWLRQRIWKHULSUDSFKDQQHOOLQHU &OHDUZDVWHGLVSRVDODUHDLQQRUWKHDVWFRUQHURISURSHUW\RQO\DVQHHGHG 10. Rough grade site, stockpile topsoil, construct channels, install culverts and RXWOHWSURWHFWLRQDQGLQVWDOOVHGLPHQWIHQFHDVQHHGHG0DLQWDLQGLYHUVLRQV DORQJWRSRI¿OOVORSHGDLO\127( $WHPSRUDU\GLYHUVLRQZLOOEHFRQVWUXFWHG DFURVVWKHPLGGOHRIWKHJUDGHGDUHDWRUHGXFHVORSHOHQJWKDQGWKHEDUHDUHDV PXOFKHGVKRXOGJUDGLQJEHGLVFRQWLQXHGIRUPRUHWKDQZHHNV 11. Finish the slopes around buildings as soon as rough grading is complete.
Leave
WKHVXUIDFHVOLJKWO\URXJKHQHGDQGYHJHWDWHDQGPXOFKLPPHGLDWHO\ &RPSOHWH¿QDOJUDGLQJIRUURDGVDQGSDUNLQJDQGVWDELOL]HZLWKJUDYHO &RPSOHWH¿QDOJUDGLQJIRUEXLOGLQJV &RPSOHWH¿QDOJUDGLQJRIJURXQGVWRSVRLOFULWLFDODUHDVDQGSHUPDQHQWO\ vegetate, landscape, and mulch. 15. Install riprap outlet channel and extend riprap to pipe outlet under entrance road. $OOHURVLRQDQGVHGLPHQWFRQWUROSUDFWLFHVZLOOEHLQVSHFWHGZHHNO\DQGDIWHU UDLQIDOOHYHQWV1HHGHGUHSDLUVZLOOEHPDGHLPPHGLDWHO\ $IWHUVLWHLVVWDELOL]HGUHPRYHDOOWHPSRUDU\PHDVXUHVDQGLQVWDOOSHUPDQHQW vegetation on the disturbed areas. (VWLPDWHGWLPHEHIRUH¿QDOVWDELOL]DWLRQ PRQWKV
7.8
MAINTENANCE PLAN $OOHURVLRQDQGVHGLPHQWFRQWUROSUDFWLFHVZLOOEHFKHFNHGIRUVWDELOLW\DQG RSHUDWLRQIROORZLQJHYHU\UXQRIISURGXFLQJUDLQIDOOEXWLQQRFDVHOHVVWKDQ once every week.
Any needed repairs will be made immediately to maintain all
practices as designed. 7KHVHGLPHQWEDVLQZLOOEHFOHDQHGRXWZKHQWKHOHYHORIVHGLPHQWUHDFKHV IWEHORZWKHWRSRIWKHULVHU*UDYHOZLOOEHFOHDQHGRUUHSODFHGZKHQWKH sediment pool no longer drains properly. 6HGLPHQWZLOOEHUHPRYHGIURPWKHVHGLPHQWWUDSDQGEORFNDQGJUDYHOLQOHW SURWHFWLRQGHYLFHZKHQVWRUDJHFDSDFLW\KDVEHHQDSSUR[LPDWHO\¿OOHG Gravel will be cleaned or replaced when the sediment pool no longer drains properly. 6HGLPHQWZLOOEHUHPRYHGIURPEHKLQGWKHVHGLPHQWIHQFHZKHQLWEHFRPHVDERXW IWGHHSDWWKHIHQFH7KHVHGLPHQWIHQFHZLOOEHUHSDLUHGDVQHFHVVDU\WR maintain a barrier. $OOVHHGHGDUHDVZLOOEHIHUWLOL]HGUHVHHGHGDVQHFHVVDU\DQGPXOFKHG DFFRUGLQJWRVSHFL¿FDWLRQVLQWKHYHJHWDWLYHSODQWRPDLQWDLQDYLJRURXVGHQVH vegetative cover.
7.9
7.10
7.11
7.12
7.13
7.14
7.15
7.16
7.17
7.18
7.19
7.20
7.21
7.22
7.23
7.24
7.25
7.26
7.27
7.28
7.29
VEGETATIVE PLAN Seedbed Preparation (SP) 63 )LOOVORSHV RUVWHHSHUWREHVHHGHGZLWKDK\GUDXOLFVHHGHU SHUPDQHQW seedings) /HDYHWKHODVWLQFKHVRI¿OOORRVHDQGXQFRPSDFWHGDOORZLQJURFNV roots, large clods and other debris to remain on the slope. 5RXJKHQVORSHIDFHVE\PDNLQJJURRYHVLQFKHVGHHSSHUSHQGLFXODUWR the slope. 3)
Spread lime evenly over slopes at rates recommended by soil tests.
63 )LOOVORSHV RUVWHHSHU WHPSRUDU\VHHGLQJV /HDYHDORRVHXQFRPSDFWHGVXUIDFH5HPRYHODUJHFORGVURFNVDQGGHEULV ZKLFKPLJKWKROGQHWWLQJDERYHWKHVXUIDFH 6SUHDGOLPHDQGIHUWLOL]HUHYHQO\DWUDWHVUHFRPPHQGHGE\VRLOWHVWV ,QFRUSRUDWHDPHQGPHQWVE\URXJKHQLQJRUJURRYLQJVRLOVXUIDFHRQWKH contour. 63 +LJKPDLQWHQDQFHWXUI 5HPRYHURFNVDQGGHEULVWKDWFRXOGLQWHUIHUHZLWKWLOODJHDQGWKH SURGXFWLRQRIDXQLIRUPVHHGEHG $SSO\OLPHDQGIHUWLOL]HUDWUDWHVUHFRPPHQGHGE\VRLOWHVWV VSUHDG HYHQO\DQGLQFRUSRUDWHWRDGHSWKRI´ZLWKDIDUPGLVNRUFKLVHOSORZ 3)
Loosen the subgrade immediately prior to spreading topsoil by disking or VFDULI\LQJWRDGHSWKRIDWOHDVWLQFKHV
6SUHDGWRSVRLOWRDGHSWKRILQFKHVDQGFXOWLSDFN 'LVNRUKDUURZDQGUDNHWRSURGXFHDXQLIRUPDQGZHOOSXOYHUL]HGVXUIDFH /RRVHQVXUIDFHMXVWSULRUWRDSSO\LQJVHHG 63 *HQWOHRUÀDWVORSHVZKHUHWRSVRLOLVQRWXVHG 1)
Remove rocks and debris.
$SSO\OLPHDQGIHUWLOL]HUDWUDWHVUHFRPPHQGHGE\VRLOWHVWV VSUHDG HYHQO\DQGLQFRUSRUDWHLQWRWKHWRS´ZLWKDGLVNFKLVHOSORZRUURWDU\ tiller. %UHDNXSODUJHFORGVDQGUDNHLQWRDORRVHXQLIRUPVHHGEHG 5DNHWRORRVHQVXUIDFHMXVWSULRUWRDSSO\LQJVHHG
7.30
Seeding Methods (SM) 60 )LOOVORSHVVWHHSHUWKDQ SHUPDQHQWVHHGLQJV 8VHK\GUDXOLFVHHGLQJHTXLSPHQWWRDSSO\VHHGDQGIHUWLOL]HUDZRRG¿EHU PXOFKDWOEIW 2DQGPXOFKWDFNLIHU 60 *HQWOHWRÀDWVORSHVRUWHPSRUDU\VHHGLQJV 1)
Broadcast seed at the recommended rate with a cyclone seeder, drop spreader, or cultipacker seeder.
2)
Rake seed into the soil and lightly pack to establish good contact.
Mulch (MU) 08 6WHHSVORSHV RUJUHDWHU ,QPLGVXPPHUODWHIDOORUZLQWHUDSSO\OEIW 2 grain straw, cover ZLWKQHWWLQJDQGVWDSOHWRWKHVORSH,QVSULQJRUHDUO\IDOOXVHOE IW 2ZRRG¿EHULQDK\GURVHHGHUVOXUU\ 08 +LJKPDLQWHQDQFHYHJHWDWLRQDQGWHPSRUDU\VHHGLQJV $SSO\ OEIW 2 (4,000 lb/acre) grain straw and tack with 0.1 gal/yd 2 DVSKDOW JDOIW 2). 08 *UDVVOLQHGFKDQQHOV Install excelsior mat in the channel, extend up the channel banks to the KLJKHVWFDOFXODWHGGHSWKRIÀRZDQGVHFXUHDFFRUGLQJWRPDQXIDFWXUHU¶V VSHFL¿FDWLRQV 2QFKDQQHOVKRXOGHUVDSSO\OEIW 2 grain straw and anchor with 0.1 gal/yd 2 JDOIW 2) asphalt. Maintenance (MA) 0$ 5HIHUWLOL]HLQODWHZLQWHURUHDUO\VSULQJWKHIROORZLQJ\HDU0RZDV desired. 0$ .HHSPRZHGWRDKHLJKWRILQFKHV)HUWLOL]HZLWKOEDFUH OE IW 2 QLWURJHQLQZLQWHUDQGDJDLQWKHIROORZLQJIDOO 0$ ,QVSHFWDQGUHSDLUPXOFKDQGOLQLQJ5HIHUWLOL]HLQODWHZLQWHURIWKH IROORZLQJ\HDUZLWKOEDFUH OEIW 2).
Mow regularly to
DKHLJKWRILQFKHV 0$ 7RSGUHVVZLWKIHUWLOL]HULIJURZWKLVQRWIXOO\DGHTXDWH 0$ 7RSGUHVVZLWKOEDFUH OEIW 2 QLWURJHQLQ0DUFK,IFRYHULV QHHGHGWKURXJKWKHIROORZLQJVXPPHURYHUVHHGZLWKOEDFUH.REHOHVSHGH]D
7.31
7.32
Grassed channels with side slopes 3:1
/RZ maintenance areas
Areas requiring FRYHUIRU less than 1 year
3
4
5
3
2
7DOOIHVFXH .REHOHVSHGH]D Bermudagrass 15 German millet 10
Summer
German millet 40 Rye grain 120 .REHOHVSHGH]D
Summer Fall & Winter
120
Rye grain 120 .REHOHVSHGH]D
Rye grain
120
Spring
Winter
7DOOIHVFXH .REHOHVSHGH]D Bahiagrass 25 Rye grain 40
10
7DOOIHVFXH German millet
Summer Spring or Fall
40
7DOOIHVFXH Rye grain
)DOO Spring
Winter
Rye grain
German millet 40 7DOOIHVFXHEOHQG
Summer Fall
Rye grain 120 .REHOHVSHGH]D
Spring
120
Rye grain
Winter
lb/ac
German millet 40
7DOOIHVFXH .REHOHVSHGH]D Bahiagrass 25 Rye grain 40
lb/ac
Summer
Spring or IDOO
Season3
Temporary
63
63
63
63
63
63
Seedbed Preparation
VEGETATIVE PLAN1
60
60
60
60
60
60
Seeding Method
08
08
08
08
08
Mulch
0$
0$
0$
0$
0$
0$
0$
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Maintenance
Include topsoil stockpiles here
Treat temporary GLYHUVLRQVDVORZ maintenance, permanent (area 4)
8VHWKHVHVSHFVIRU temporary diversions.
For temporary seeding LQVSULQJRUIDOOVHH 5 below.
7DOOIHVFXHFDQEH VHHGHGLQVSULQJ increase rate to 250 lb/ac. Temp. seeding IRUIDOOLVWKHVDPH DVIRUZLQWHU
Permanent mixture also XVHGIRUORZPDLQW areas (4). Overseed winter plantings RIU\HZLWK.REH OHVSHGH]DLQ0DUFK LIJUDGLQJLVQRW complete.
Notes
6SULQJ )HE$SU 6XPPHU $SU$XJ )DOO $XJ2FW :LQWHU 2FW-DQ
Area numbers are designated on map.
&ROXPQHQWULHVIRUVHHGEHGSUHSDUDWLRQVHHGLQJPHWKRGPXOFKDQGPDLQWHQDQFHUHIHUWR$WWDFKPHQW
+LJK maintenance WXUI
2
1
Steep slopes ORZ maintenance
1
Area No.2 Description
Permanent
Seeding Mixture
TABLE 1:
SUPPORTING CALCULATIONS RUNOFF CALCULATIONS Method: Peak Discharge Method IRU6PDOO:DWHUVKHGV NOTE:
SCS Technical Release No. 55, Urban Hydrology
Other acceptable methods such as Rational Method may also be used.
Calculate peak runoff rate for site during development--Design point outlet at northwest property corner.
6LWHLQIRUPDWLRQ
1.
1)
Site location: South Granville County +\GURORJLFVRLOJURXSIRU&UHHGPRUHVDQG\ORDP & $SSUR[LPDWHK\GUDXOLFOHQJWK IHHW $YHUDJHZDWHUVKHGVORSH DFUHVLQVLWH DFUHVFRQWULEXWLQJUXQRIIWR construction area at outlet in N.W. corner 2IIVLWHUXQRIILQWRSURMHFWDUHD DFUHVZRRGVDQGRSHQ land.
Weighted curve number (CN) (Table 8.03b)
Land Use Newly graded :RRGVRUIRUHVW good cover
Percent
CN 93
Product 58.13
37.5
70
100.0
84.38
Weighted CN = 84.38, use 85.
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4.
)LJXUHVKDQGM \UKUVWRUP LQ \UKUVWRUP LQ
LQ LQ
Calculate Peak Discharge Rate D 1RDGMXVWPHQWIRUZDWHUVKHGVKDSHLPSHUYLRXVDUHDFKDQQHO LPSURYHPHQWVRUSRQGLQJDUHUHTXLUHG$GMXVWPHQWIRUVORSHZLOO be made. E 3HDNUXQRIIUDWHPRGHUDWHVORSH FIVLQFKRIUXQRIIIURP'$ DFV )LJXUHS F 0XOWLSO\GLVFKDUJHLQFKRIUXQRIIE\UXQRIIGHSWK Q 2,24 FIVLQFKUXQRII[LQ FIV Q10,24 FIVLQFKUXQRII[LQ FIV
7.33
$JUDSKRISHDNGLVFKDUJHUDWHYVDUHDZDVGHYHORSHGIURP )LJXUHVRDQGSWRIDFLOLWDWHWKHGHVLJQRIZDWHUZD\V GLYHUVLRQVDQGRWKHUSUDFWLFHVZKRVHGHVLJQVSHFL¿FDWLRQV DUHEDVHGRQSHDNÀRZVIURPDUHDVOHVVWKDQWKHHQWLUHVLWH (Exhibit 4). G $GMXVWSHDNGLVFKDUJHUDWHIRUDFWXDOZDWHUVKHGVORSH (Table 8.03d): Q 2,24 FIV[ FIV Q10,24 FIV[ FIV H $GGRIIVLWHUXQRIIWKDWZLOOHQWHUVLWHIURPWKHHDVWIURPZRRGV and open land. DFUHV4 10,24 FIV TotalQ 10,24 FIV
7.34
SEDIMENT BASIN DESIGN
$OOUXQRIIIURPVXEZDWHUVKHGVDQG DFUHV ZLOOHQWHUWKHEDVLQ 'HWHUPLQHWKHSHDNÀRZVRIWKH\HDUKRXUVWRUP4 10,24. D 3HDNÀRZ 6HH6KHHW5XQRIIFDOFXODWLRQV 410,24 FIV $GGLQRIIVLWHFRQWULEXWLRQVWKDWPXVWSDVVWKURXJKEDVLQ FIV FIVWRWDO
2.
Determine basin volume: D 0LQLPXPUHTXLUHGVHGLPHQWYROXPH 6WGDQG6SHF 9 IW 3DFUH[ DFUHV IW 3.
'HWHUPLQHVKDSHRIEDVLQ D %\H[DPLQLQJFRQWRXUVRQVLWHPDSEHIRUHFKDQQHOLQVWDOODWLRQRURWKHU PRGL¿FDWLRQ
(OHYDWLRQ IW 338 339 340 341 342 343
$UHD IW2) 3200 5400 9000 11400 13300
'HSWK IW 0.5 1.5 2.5 3.5 4.5 5.5
6WRUDJH IW3) 800 5,100 12,300 32,100 44,450
(OHYDWLRQ\LHOGVIW 3RIVWRUDJHIRUVHGLPHQWPHHWVGHVLJQ requirement.
3ULQFLSDOVSLOOZD\GHVLJQ FPSSLSHVSLOOZD\ IRUWHPSRUDU\EDVLQ 6HWSULQFLSDOVSLOOZD\FUHVWDWWRSRIUHTXLUHGVHGLPHQWSRROHOHY D 7KHPLQLPXPFDSDFLW\RISULQFLSDOVSLOOZD\VKRXOGEHFIVSHUDFUHRI GUDLQDJHDUHD 6WG 6SHFSULQFLSDOVSLOOZD\ Qmin DFUHVDFUHV[FIV aFIV NOTE 'HYHORSHUKDG´FPSLSHDYDLODEOHODUJHUWKDQPLQLPXPSLSHVL]HV DUHSUHIHUUHGZKHQSUDFWLFDOWRUHGXFHIUHTXHQF\RIHPHUJHQF\VSLOOZD\ operation. 3LSHÀRZLVGHWHUPLQHGIRUZDWHUDWWKHFUHVWRIWKHHPHUJHQF\VSLOOZD\IW DERYHWKHULVHULQOHW7DLOZDWHUDVVXPHGDWPLGGOHRISLSH + IW6HHVNHWFK SDJH EDUUHOOHQJWK IW Q pipe FIV[ FIV 7DEOHD Determine riser requirement. PDWFKHV´SLSHEDUUHO
From Figure 8.07b, riser: 21 in. diameter
'HWHUPLQHFDSDFLW\RIFPSULVHU)URP)LJXUHEIRUK IW4 riser = 17 FIV 4 riser > Q pipeSLSHÀRZJRYHUQV
7.35
5.
Emergency Spillway Design
6HWHPHUJHQF\VSLOOZD\HOHYDWLRQIWDERYHSULQFLSDOVSLOOZD\RUHOHY a) Capacity Qe = Q10,244 p Q e FIV FIV FIV SULQFLSDOVSLOOZD\GLVFKDUJH DW+ IW GHVLJQVWDJHIRUHPHUJHQF\VSLOOZD\ÀRZ E 'LPHQVLRQVIRUHDUWKVSLOOZD\IURP7DEOHF6RLOERULQJVLQGLFDWHWKDW VRLORIWKHVSLOOZD\LVUHVLVWDQWWRHURVLRQ NOTE )RUVLWHGHVLUDEOHVWDJHLQVSLOOZD\IW
4 FIV H p IW E IW
8VHIWERWWRP
$GGIWIUHHERDUGPLQLPXP 6HWWRSRIGDPIWDERYHGHVLJQVWDJHRIHPHUJHQF\VSLOOZD\RUHOHY c) Antiseep collars QRWFORVHUWKDQIHHWWRDSLSHMRLQW FROODU¶[¶ 6WG 6SHFVHGLPHQWEDVLQ
$QFKRUSULQFLSDOVSLOOZD\ 'RZQZDUGIRUFH [XSZDUGIRUFH 5HTXLUHGQHW[IW[ LQFKHVLQFKHVIW 2[[OEIW 3 = 1078 lb 4 Use concrete 1 IW 3 or approx. 1/2 yd 3 = 1140 lbs. 1
7.
8VHEXR\DQWZHLJKWRIFRQFUHWHIRUQHWGRZQZDUGIRUFHLWH[HUWV
Dewatering the basin: 3HUIRUDWHWKHULVHUZLWKóWRòLQFKKROHVVSDFHGLQFKHVDSDUW&RYHUWKH SHUIRUDWHGVHFWLRQZLWKDôLQFKJUDYHO¿OWHUIHHWWKLFN
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9.
Embankment design: IRRWWRSZLGWK VLGHVORSHVVHWWOHGWRSHOHYDWLRQ &RQVWUXFWHGWRSHOHYDWLRQIW VHWWOHPHQW DWFHQWHU grading to 344.5 at abutments. )URPVRLOERULQJVFXWRIIWUHQFKVKRXOGEHH[FDYDWHGLQWRWKHWLJKWJUD\ VXEVRLO7UHQFKGLPHQVLRQVWRIWGHHS IWZLGHZLWK VLGH slopes.
7.36
GRASS LINED CHANNELS Procedure given in Appendices 8.05 used in design. 1.
Channel #1 $OWKRXJKFKDQQHOUHFHLYHVÀRZIURPFKDQQHOPLGZD\LQLWVOHQJWKLWZLOO EHGHVLJQHGDVDVLQJOHUHDFKLQVWHDGRIVHSDUDWHUHDFKHV7KHÀRZLQWKH XSSHUUHDFKZLOOEHFRQVLGHUDEO\OHVVWKDQWKHGHVLJQÀRZEXWIRUFRQVLVWHQF\ in dimensions, grade, and appearance the upper reach will not be designed VHSDUDWHO\)LQDOGHVLJQLVEDVHGRQWKHUHPRYDORIWKHWHPSRUDU\GLYHUVLRQV D (VWLPDWHGUDLQDJHDUHDDQGGHWHUPLQHSHDNÀRZLQWRFKDQQHO Area = 1.9 acre $YHUDJHVORSHRIGUDLQDJHDUHD Q 10,24 FIV ([KLELW 2IIVLWHFRQWULEXWLRQV )ORZIURPFKDQQHO FIV For design purpose Q 10,24 FIVFIV FIV E 3URSRVHGFKDQQHOJUDGH c) Proposed vegetation: Tall Fescue d) Soil: Creedmore (easily erodible) e) Permissible velocity: (V p IWV 7DEOHD I 5HWDUGDQFHFODVV ³%´XQPRZHG³'´PRZHG 7DEOHF J 7UDSH]RLGDO&KDQQHOGLPHQVLRQV GHVLJQLQJIRUORZUHWDUGDQFHFRQGLWLRQ UHWDUGDQFHFODVV' GHVLJQWRPHHW Vp $ 49 FIVIWVHF IW 2 7U\ERWWRPZLGWK IW Z = 3 A = bd + Zd 2 3 EG] 2+1 An iterative solution using Figure 8.05c to relate hydraulic radius depth WR0DQQLQJ¶VQSURFHHGVDVIROORZV 0DQQLQJ¶VHTXDWLRQLVXVHGWRFKHFN velocities.
7.37
G IW $ IW2) 5 IW
n
9 ISV 4 FIV
0.8
4.32
0.54
0.043
3.25
14.0
0.9
5.13
0.59
0.042
3.53
18.1
Comments V Q22. V >Vp, needs protection
9HORFLW\!ISVFKDQQHOUHTXLUHVWHPSRUDU\OLQHU L &DOFXODWHVKHDUVWUHVVIRU4 2 7 7
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7.38
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Comments T
Channel Summary: 7UDSH]RLGDOVKDSH] E IWG IWJUDGH Temporary liner: straw with net
2.
Channel #3 &KDQQHOGHVLJQFDSDFLW\WRLQFOXGHÀRZWKDWZLOOEHGLYHUWHGIURPVRXWKGXULQJ construction because diversion may be removed when construction is complete. D
(VWLPDWHGUDLQDJHDUHDDQGGHWHUPLQHSHDNÀRZVLQGLWFK $UHDaDFUHV $YJVORSHRIGUDLQDJHDUHD Q 10,24 FIV ([KLELW 2IIVLWHFRQWULEXWLRQ QRQH
E c) d) H I J
3URSRVHGFKDQQHOJUDGH Proposed vegetative cover: Tall Fescue Soil: Creedmore (easily erodible) 3HUPLVVLEOHYHORFLW\IRUHVWDEOLVKHGYHJHWDWLRQ IWV 7DEOHD 5HWDUGDQFHFODVV³%´XQPRZHG³'´PRZHG 7DEOHF 7UDSH]RLGDO&KDQQHO ]
By the same method as channel #1:
Description cut (D)
E IW 3.0
uncut (B)
3.0
h)
G IW $ IW2) 5 IW 1.2 7.42 0.748 1.7
13.77
1.00
9 ISV 2.7 1.0
Q (cps) Comments 21.1 Q > Q10, V < Vp 13.8
Q > Q10
Evaluate Temporary Liner Requirements: 'HWHUPLQHYHORFLW\DQGGHSWKRIÀRZIRU\UKUVWRUP%HFDXVHWKH channel will be protected by a temporary diversion, the drainage area FRQWULEXWLQJWKHÀRZGXULQJFRQVWUXFWLRQLVUHGXFHGWRDFUH4 2,24 = 3.7 FIV 8VLQJ0DQQLQJ¶VHTXDWLRQZLWK³Q´ 7DEOHE
G IW 0.32
A IW2) 1.27
5 IW 0.25
9 ISV
4 FIV
Comments Q>Q2, V>Vp, needs protection
9HORFLW\!ISVLVH[FHVVLYHIRUEDUHVRLOFRQGLWLRQVUHTXLUHVWHPSRUDU\ liner. i.
Calculate shear stress in channel at depth associated with Q 2,24. 7 \GV OEIW 2 -XWHQHWLVDQDFFHSWDEOHWHPSRUDU\OLQHU 7DEOHJ KRZHYHUVWUDZZLWK net will SURYLGHDGGLWLRQDOSURWHFWLRQDVZHOODVPXOFKIRUVHHGLQJ
7.39
Channel #3 Summary: 7UDSH]RLGDOFKDQQHO] E IWG IWJUDGH Temporary liner: straw with net
3.
Channel #2 D
(VWLPDWHGUDLQDJHDUHDDQGGHWHUPLQHSHDNÀRZVLQWRFKDQQHO Area = 0.8 acres $YHUDJHVORSHRIGUDLQDJHDUHDa PRGHUDWH Q10,24 FIV ([KLELW 2IIVLWHFRQWULEXWLRQ 1RQH Because diversion will protect entire channel during construction, overland ÀRZFRQWULEXWLQJWR4 2,24SHDNÀRZZLOOEHQHJOLJLEOH Q10,24 FIV
E c) d) H I J
3URSRVHGFKDQQHOJUDGH Proposed vegetative cover = Tall Fescue Soil: Creedmore (easily erodible) 3HUPLVVLEOHYHORFLW\ IWV 7DEOHD 5HWDUGDQFHFODVV ³%´XQPRZHG³'´PRZHG 7DEOHF 7UDSH]RLGDOFKDQQHOE IW]
Description E IW cut (D) 2.0 uncut (B) 2.0
d IW 1.0 1.4
$ IW2) 5 IW 4 FIV 9 ISV 5.00 14.5 2.90 0.80 8.19 0.94
h) Evaluate temporary liner requirements:
Comments Q > Q10, V < Vp Q > Q10
Not necessary, negligible Q2ÀRZ
Channel #2 Summary: 7UDSH]RLGDOFKDQQHO E IW] G IWJUDGH Temporary liner: none required. 6WUDZPXOFKWDFNHGZLWKDVSKDOWFRXOGEHXVHGWRIDFLOLWDWHYHJHWDWLYH establishment. However, since all other channels need temporary liner (mulch ZLWKQHWWLQJ XVHWKHVDPHPDWHULDOVIRUFKDQQHO
4.
Channel #4 D
(VWLPDWHGUDLQDJHDUHDDQGGHWHUPLQHSHDNÀRZLQWRGLWFK Area = 0.75 acre $YHUDJHVORSHRIGUDLQDJHDUHD Q10,24 FIV ([KLELW
E F d) H
7.40
3URSRVHGFKDQQHOJUDGH 3URSRVHGYHJHWDWLYHFRYHU 7DOOIHVFXH Soil: Creedmore (easily erodible) 3HUPLVVLEOHYHORFLW\ IWV 7DEOHD
I 5HWDUGDQFH&ODVV ³%´XQPRZHG³'´PRZHG 7DEOHF J 7UDSH]RLGDOFKDQQHOGLPHQVLRQV ] By same method as channel #1:
Description cut (D)
E IW 2.0
G IW 1.00
$ IW2) 5.00
uncut (B)
2.0
1.7
12.1
h)
R IW 9 ISV Q (cps) 1.95 9.75
Comments Q>Q10, Vp2.
Q>Q102.
0.95
7.3
Evaluate temporary liner requirements: 8VLQJ0DQQLQJ¶VHTXDWLRQZLWK³Q´ 7DEOHE Q 2,24 FIV
G IW 0.35
$ IW2) 1.07
5 IW 9 ISV 4 FIV Comments 0.25 3.10 3.32 Q>Q2, V>Vp, needs protection
9HORFLW\!ISV UHTXLUHVWHPSRUDU\OLQHU L
&DOFXODWHVKHDUVWUHVVIRU4 2,24 conditions. 7 \GV OEIW 2 -XWHQHWLVDQDSSURSULDWHWHPSRUDU\FKDQQHOOLQHU 7DEOHH KRZHYHU VWUDZZLWKQHWZLOOSURYLGHPRUHHURVLRQSURWHFWLRQEHWWHUPXOFKIRU seeding, and will be consistent with channels #1 and #3.
&KDQQHO6XPPDU\ ] E G IWJUDGH Temporary liner: straw with net 1
NOTE
)RUXQLIRUPLW\RIFRQVWUXFWLRQPDNHFKDQQHOERWWRP¶ZLGHVDPHDVDOO other channels even though design only requires a 2.0’ bottom width.
RIPRAP CHANNELS D (VWLPDWHRQVLWHGLUHFWUXQRIIIURPGUDLQDJHDUHDDQGFDOFXODWHSHDNÀRZ DGGÀRZIURPFKDQQHOV Area = 3.74 acres $YHUDJHVORSHRIGUDLQDJHDUHD PRGHUDWH Q 10,24 FIV ([KLELW
Channels 2 1 4
Q10,24 FIV FIV FIV FIV
2WKHUÀRZFRQWULEXWLRQV 2IIVLWHFRQWULEXWLRQ FIV 'HVLJQÀRZ 4 10,24 FIVFIVFIV FIV
7.41
E 3URSRVHGFKDQQHOJUDGH c) Proposed liner: riprap G 7UDSH]RLGDOFKDQQHOLVGHVLJQHGZLWKFDSDFLW\WRPHHWGHVLJQÀRZ5LSUDS OLQHUUHTXLUHPHQWVDUHWKHQDQDO\]HG)LUVWHVWLPDWHDWULDOULSUDSVL]HRI LQFKHV)RUÀRZRIWKHH[SHFWHGGHSWKUDQJHRIWRIWQ 7DEOH I DQG7 d 7DEOHJ ] Channel dimensions:
E IW G IW 1.2 e)
$ IW2) 10.1
n 0.044
S
9 ISV
4 FIV 77.3
Determine riprap requirements 7 \GV ZKHUH \ XQLWZHLJKWRIZDWHU OEIW 3) G ÀRZGHSWK IW V FKDQQHOJUDGLHQW IWIW Since T d 7VHOHFWDODUJHUVWRQHVL]HDQGDODUJHUERWWRPZLGWK7U\E IWG 50, = 12 in. From Table 8.05g T d IURP7DEOHIQ
E IW G IW $ IW2) 8 1.2 12.48
5 IW 0.93
4 FIV 72.3
7 OEIW2) 4.5
Comment Q>Q10, T