Loading...
HomeMy WebLinkAboutSW4200702_SW Report_20201208 LEWISVILLE COMMUNITY CENTER FORSYTH COUNTY, NC STORMWATER CALCULATIONS SEPTEMBER 9, 2020 PREPARED BY: Adam Carroll, PE 8642 W. Market St., Suite 136 Greensboro, NC 27409 336.478.3346 adam.carroll@timmons.com Table of Contents - NOAA Precipitation Frequency Data - Outlet Protection Calculations - Culvert Calculations - Swale Calculations - Storm Pipe Calculations - Biocell Calculations 1 www.timmons.com CJP.SFUFOUJPO!BSFB!EFTJHO!TIFFU Qspkfdu!Jogpsnbujpo Qspkfdu!Obnf;Mfxjtwjmmf!Dpnnvojuz!Dfoufs Ujnnpot!Qspkfdu!$;565:: Eftjhofe!cz;KTNEbuf;:0:03131 Sfwjtfe!cz;!..Ebuf;.. Difdlfe!cz;!KBDEbuf;:0:03131 Eftjho!Opuft; !Qfs!uif!Kvmz!3118!CNQ!Nbovbm!tj{joh!jt!cbtfe!po!uif!Tjuf!Svopgg!Wpmvnf!gps!uif!gjstu!jodi!pg!svopgg/ J/!!Svopgg!Efqui!Nfuipepmphz!)Esbgu!CNQ!Nbovbm!Tj{joh!Dsjufsjb* Tjuf!Jogpsnbujpo Esbjobhf!Bsfb!)EB*!>!3/96Bdsft Jnqfswjpvt!Bsfb!)EB*!>!2/72Bdsft Qfsdfou!Jnqfswjpvt!)J*!>67/6& Sfrvjsfe!Tupsbhf!Wpmvnf!)Xbufs!Rvbmjuz*! Eftjho!Tupsn!>!2jodi Efufsnjof!Sw!Wbmvf!>!1/16!,!/11:)J*!>!1/67jo0jo Tupsbhf!Wpmvnf!Sfrvjsfe!)W*>!6-888dg! Cjpsfufoujpo!Tvsgbdf!Bsfb!)Cpuupn!pg!Cjpsfufoujpo!Bsfb* Eftjsfe!efqsfttjpo!efqui!>23jo Tvsgbdf!Bsfb!Sfrvjsfe!)TB*!>!6-888 tg Tvsgbdf!Bsfb!Qspwjefe!)TB*!>!7-116 tgu 2!pg!5 JJ/!!Cjp.sfufoujpo!Efqui!boe!Tpjm!Uzqf !!!!!!!!!!Njojnvn!efqui!pg!cjp.sfufoujpo!bsfb!>!3/6gu Dpoevdujwjuz!pg!Cjp.Tpjm!NjyTjuf!Tpjm!Dpoevdujwjuz 3 TpjmDpoevdujwjuz!)L*TpjmDpoevdujwjuz )jo0is*)jo0is* Tboe7DmD2/89 Mpbnz!Tboe3 Tboez!Mpbn1/6!.!2 !L!>! 2/1)dpotfswbujwf* bwh Xbufs Gjmm!Tpjm!Mbzfs.Xjui!Tfu!Izesbvmjd Dpoevdujwjuz!)L*/!!L!fyqfdufe!up!sbohf gspn!1/6!up!7!jo0is!)2.3!jo0is!UZQ* MI Spdl!Mbzfs!x0!Esbjo!Qjqft JJJ/!!Dbmdvmbuf!Xbufs!Esbx!Uispvhi!Sbuf R)dgt*!>!)3/4F.6*+L+B+I0M bwh Xifsf; R!!!!!!>!Gmpx!)Sbuf!pg!esbx*!uispvhi!Cjp.Sfufoujpo!Tpjm!)dgt* L!>!Izesbvmjd!Dpoevdujwjuz!pg!Tpjm!)jo0is* bwh! B!!!!!!>!Tvsgbdf!Bsfb!pg!Cjp.Sfufoujpo!Bsfb!)tg* I!!!!!!>!Ifjhiu!pg!xbufs!bcpwf!hsbwfm!fowfmpqf0esbjobhf!qjqf!{pof M!!!!!!!>!Uijdloft!pg!Tpjm!)bt!efufsnjofe!bcpwf* L>!! 2/1jo0is bwh! B!>!7-116tg 4 I!>!4/6gu 4 M!>!3/6gu 4 !!I!!M-!)ps!vomftt!M!jt!tnbmm-!tvdi!bt!3/1!gffu*-!bmmpx!I0M!>!2 R>1/2:dgt Gjoe!ujnf!up!esbxepxo!xbufs!gspn!jovoebujpo!up!tbuvsbujpo!bu!tvsgbdf; Cjpsfufoujpo!Wpmvnf!)W*!>!TB!y!Efqsfttjpo!Efqui t.2 W!> 7-116dg t.2 Ujnf!up!sfnpwf!W!pg!xbufs!bu!gmpxsbuf-!R t.2 U!>!W0R t.2J.t U!>42167tfdpoet t.2 U!>9/74ipvst=!23!ipvst t.2 3!pg!5 Ujnf!up!esbxepxo!xbufs!gspn!tbuvsbujpo!bu!tvsgbdf!up!Y!gffu!cfmpx!tvsgbdf; Qpsptjuz-!o!>1/56 Y!>!3/6 gu Dbmdvmbuf!wpmvnf!pg!xbufs!up!esbxepxo!jo!5!gffu!pg!tpjm; W!>!Y!)gu*!+!TB!+!o t.3 W!> 7867dg t.3 Ujnf!up!sfnpwf!xbufs!gspn!W; t.y U!>!W0R t.3t.y U!>45:49tfdpoet t.3 U!>:/81ipvst t.3 Upubm!ujnf!up!esbx!xbufs!uispvhi!tpjm; Ujnf!>!U!,!U t.2t.3 Esbxepxo!Ujnf!>!29/44ipvst=!59!ipvst JW/!!Tj{joh!Voefsesbjo!Qjqft!boe!Hsbwfm!Fowfmpqf R!>1/2:dgt Tj{f!esbjot!tp!uifz!bsf!bcmf!up!dbssz!21Y!uif!tpjm!esbxepxo R!>!2/:dgt Nboojoh!Spvhioftt!Dpfggjdjfout; Qjqf!Uzqf!boe!EjbnfufsNboojoh!Spvhioftt!Dpfggjdjfou 5#!Tjohmf!Xbmm!Dpssvhbufe!Qmbtujd1/1256 5#!Tnppui!Xbmm!Qmbtujd1/1216 7#!Tjohmf!Xbmm!Dpssvhbufe!Qmbtujd1/1256 7#!Tnppui!Xbmm!Qmbtujd1/1216 9#!Tjohmf!Xbmm!Dpssvhbufe!Qmbtujd1/1266 E!>!27!+!)R+o0t_1/6*_/486 o!>!1/1216 t!>1/116)joufsobm!tmpqf!.!sfdpnnfoefe!1/6&* E!>21/1jodift !!Ovncfs!pg!Qjqft!Sfrvjsfe!jo!Voefsesbjo!)qfs!Ucm!6.2-!ODEFOS!CNQ!Nbovbm* Jg!E!jt!=$!5#!QjqftJg!E!jt!=$!7#!Qjqft 6/2438/953 6/:64:/224 7/77521/245 8/336 8/867 9/38 21!jodift!jt!mftt!uibo!21/24!jodift-!uifsfgpsf-!gpvs!)5*!7#!IEQF!tnppui!xbmm!qjqft!bsf! sfrvjsfe/ Uif!hsbwfm!fowfmpqf!tvsspvoejoh!uif!esbjobhf!qjqf!up!cf!9#!effq!bu!b!njojnvn/ !!Voefsesbjot!Qspwjefe Ejbnfufs!>7jo Rvboujuz!>5 4!pg!5