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Email Attachment to Brettb t `~ ~-° Lot size ~auerage, acres) ...........................<,..,......,....,......., Building PernnitfCQmmercial Plat: Building{s} ~taatprint, acres} ............................................... Concrete paving (acres} ..................................................... Gravel surface ~aeres} ........................................................ Lattiee black paving ~acreS} ................................................ Public roads-lnctuding gravel shoulder (acresj,........,.. Private roads-including gravel shoulder nacres}..,......,, t?n-site impervious surface total nacres] ....................... Part 5 - Fre-develoaeci Protect Site Characteristics: f~tA 4..44 Acres 4.28 Acres N!A N!A 0.25 Acres (ofif-site} 4.33 Acres 9.05 Acres Stream through site (yfn} ..................................... Yes Name ................................................... Yelm Create Shoreline [3esignation ......................... Urban Type of #eature this facility discharges to {i.e., lake, stream, intermittent stream, iaothole, roadside ditch, stteetflow to adjacent property, etc.); Spreader Trench GRt}UhID Swages {y!n} ............................................................... Steep slopes-steeper than 1Q% ~yfn} ........................ Erosian hazard {ytn} ................................................... 1t10-year floodplain {yfn} ........................~..........,........ Y Wetlands (ytn} ............................................................ N Seepslsprings (yrn} .................................................... High groundwater taEale ~yJn} ...................................... Creek ..................................................................:...... Y Park 6 -- Facility ^escrigtion Total area tributary tc~ facility including off-site (.acres} .................. 4.92 Acres Total on-site area tributary to facility nacres) ......................... ........ q,92 Acres Design impervie~us area tritau#ary to facility nacres} ........................ 9.45 Acres Design iandscaped area tributary tc~ facility nacres} ....................... 3.47 Acres Design total tributary area to facility (acres} .................................. X1.12 Acres Enter "9" #or type of #aciliky; s~r~aAriTt~~ rt~~~~ r 2.~s ~ f ~,=~~E ~~$ .~ ~ - ~ ~-~- PRE-l3EVELCIPMENT ST[]RM EVENT SUMMARY t __Event Psak Q (c#s} Peak.T ~hrs}< Hyd Ycsl (acft} Area_{ao} ~Methodi Ra~ntype ~-month € v D, 3386 7.83 _ _ ~ {}.1078 1.3000 SBUH TYPEIA -- - a 2 year --0.599t_ 7 $3~~~~ 6.1922 ; 1; 0 sBUN ~ TYPEIA ~Q yearJ __ 09235_ _..~ __._._, 7 $3 ..._.., ... a~2~~9. -._ _ _ 1_30Q0 _SBUH ;~TYPF=IA 25 year 1.0$44 ___7.$3 .._ ~~3~39_ _ ~ °6 3i}OU , _SI~Uf-t ; TYPEIA ears 1.2448.. _ . 7.83 0.4079 1.3000 SBUH TYPEIA PRE-QEVELC}PMENT AREA SUMMARY Qesign Method... C_._._ SBUH Rainfall type ~ . P~1A Nyd lntv_.__. _ ___ . ---. _.. _._..._ __ _10.(lQ min _ ;,Eeak g for ~__.._. ~484.~Q _._ ~, _ ~~~-W-~_-~ .. _. ~ Alastraction Goeff __.__r_.:.. Pervious Area ~AAAC 2} ~~~0.00 ac ~~CIA ~ 1.30 ac ~~~ Pervious CN . ~~mm 0.00 m~ ~. ___ DC N ~ _w_.._____ w Pervious TG ~ f1.00 min l C TC ~_ ~ 0.58 min r: ~.._ .._._ _ _ __. D~recHy Conner#ed CN Cale __ ~ __-- ~.._.__ ~ ':~ Qescription __ SuhArea j--Sub cn ~~ _w_._._.__.~ _ impervious surfaces,(pavements, roofs, etc} ., . -- ~ r.___. .w~.. . ~ 1.30 ac ~. 9$.00 g . ....~..,. `~~~ ~_ __ -_ DC Cotrcposited CN (AMC 2} ~~, _._..._r_ _~. ~~......_98 OQ '! ~~ ~ .-_~ _ . ~..~..~._ --_____ ~._.~ Type ~ ~.~ .-- _ Sheet ~~Ghannel {interm} ~~ _ __._ _,~ _~._ ~.__ Qerectly ~iKSnnect@d TC l:alc w....~. - _..__m _ ~.._..µDescription ~ Length i Slope __._a_ ____._.._._...-__._ ...... _-- . ~.. Smooth Surfaces.: 0.011 I3a 40 ft ;10 00°l0 ~_. [Concrete pipe (n-0.012}200.00 ft r2 00°l~, Directly Connected TC _..._..._. _ _..~w_ ~; .... i ,Coeff Misr I TT '; _. _ :_ _ ~0 011 a j0 00 en 0 QO m~r~ ~_ ~. .(1,0120 ;0.5C micro I, ~..0.86min !; S~h~ANTHA Rl~.'~E i2.p5 ~r"' PACE c;' Z`~ - «3 ~.... ~ - ~~°` ~~ PAST-DEVELOPMENT STf~RM EVEMT SUMMARY" i Event ~ Peak Q (cfsa~ Peak T (hrsy Wyd Vol (acttj Area (ac} Method; Raintype; 6-mvnth~ __4.3386 _; 7.83... (}.1078.... 1 3004 SBUH ; TYPE1A . Z year_r 4.5991...- _7.83 . 4.1922 I 1 _34Q0 SHUN TYPEIA r 14 year 0,9235 ~ 7.83. ;I 42999 1.340[l ~SSUH ~TYI'E1A ~ 25 year,. _ 1,0844 t~.~.7.83 0.3539 -~ 100 year ." _1.2448 __ 1 _~-_83 .....; . Q.4Q79 __~ _ ~._.1.3QOQ i SB'tJH T~'i'E1A a ; ~ ~1.3Q4Q W SBUH s TYPEIA ~~~" -a PAST-DEVELOPMENT AREA SUMMARY w~-~ ''~ i Design Method ~ SRUN Rainfall type G PE1A i e Nyd lnty _ _ ... _._._ - _ ;~ 10.00 rrEin Peaking Factor I 4 4.00 Afastrac#ion Coeff "___ ~- 20 .... f----- -W Rerv~ous Area {AIIMC 2) ~ 0.00 ac . DCIA € 1.30 ac _- . . Pervious CN __ . . 0.00 DC GM . Pervious TC ~.~... __ 1 0.04 min ~(laC TC ~ 0.58 rnin p ~ _ _ . . Directly Connected CM Galc ...._.. ' ~. . _._ Descri tion I R ~_..YSubArea _"___v_.x_._-- - _.-. ._ _._~_ __ w".. ~__~_~".. Impervious surfaces {pavements, roofs ~to~ ~ 1.30 ac E ~ 5ub cn __.._ , r 98 OLt ~ ( DG Composited GN (AMC 2) w~_-. _~._._.._._ .._ . 98.00 ~.. _~~. __ ~ . _ ___~~.._._. ---.._.__...~.~_.__...__-- _a~.~_.__.- Directly Connected TC Ca7c --- _,...,.._.__ _ ~.___ ___...__~,. ~_.__.,__ _.._~~ _w_. Type _ _ ~_. ..... ~.W__.__.-. _A..__..~.~.--_- ~ Qescription i Length ,, Sr lope ~~ Goeff j Mist ._-- ._..__".~..~ ~ TT ~_~ f(-- Sheet ~- _ _.~._...___..,__w._s. Smooth Surtaces.: x.411 ~30.Q4 ft, _. 10.4[?°!4 #[3.411 C- iQ.QU in - " __.._I rC+.t30 min j -. _.~__~.~___ !' Channel snterm ( ~ ~ ___-. _ _---w...~..__ _.~.----- ---~ ----- -- Concrete s e n-0 012 =200.00 ft 2 00% - ------ p~p f -.. ) r .A 0 4120 .k...r.__~m. 0.5fi min ~ ~ ._._ - _- Eirectly Connected TG .._ € 0 88min a SA1'~r3F1M1ITHA RIC?~E 3^c ~.~ !7? ~ PAGE ~~ 3/g r~ Lot size average, acres .................................................... NfA Build(ng PermitfCommercial Plat. Building{s} EfQOtprint, acres} ............................................... Q,44 Acres Concrete paving (acres) ........................ .... ......._ Q,28 Acres Caravel surface (acres} ........................... . ..... NfA t.attice block paving nacres} ............................................... _-~. NfA Pualic reads-including gravel shoulder nacres},..,,..,,,.. Q.25 Acres (off si#e} Private reads-including gravel shaulder (acres} .......... ®.3;~ Acres n^~~ C?n-site impervious surface total (acres ....................... _ .._ 1.45 Acres Part 5 -- Pre-developed Project Site Characteristics. Stream through site (yfn} ......................................1(es Name ........................................ .......... Yelm Creek Shtarei(ne Designation ......................... Urhar~ Type of feature this facility d(seharges tr- (i.e., lake, stream, intermittent stream, ptathc~le, roadside ditch, sheetflQVr tca adjacent property, etc.}: apraader Trench CiR(?LlNQ Svrales (yfn} ................................ ................................ tU Steep slopes-steeper than 1t7°l® ~yfnj ......................... fu :=rosion hazard {yfn} .................... ............................... tV 104-ysarfloodplain~yfn} ...........................................~. Wetlands (yfn} ............................................... .. 5eepsfsprings (yfn} .............••---•----......-....---.........,...... N High groundwater table ~yfn} ,,................ .. .................. (V Creek .................................... .............m...............,,...., 1' Part 6 -Facility Description Total area tributary to facility including off-site (acres} ................. 4.12 Acres Total on-site area tributary to facility {acres} ............. .......... 4.12 Acres ------- Design impervious area tributary to facility (acres) ....................... 1.45 Acres Qesign landscaped area°tributary to facility {acres} ....................... .Q7 Acres flesign total tributary area to facility (acres] ..................... ......... 4.1i Acres Enter "1" for type of facility: --.:=~~ qI~ PRE-DEVI=LOPMENT STCfRM EVENT StJNIMAR_Y uent Pea... __ . _... s) Peak T (hrs} H}~d Vol {acft} Area {ac} Method aintype _....- _, 6 month .4.1444 0.44 4.1356 4.1204 S(3UH _ _. TYPEIA 2 year 4.4295 8.54 0.3141 4.1204 _ SBUN TYPEIA 10 year 0.9233 _.. _ _. 8.17 0.6414 .._... 4.1204 SBt1N _ _. TYPEIA 144 year 1 5382 8 17 4.9414 4.1204 SBt1M TYPEIA .. ~°~> pR"F_CiK~ t~l MFR iT flC7G6 C19M1AM rt~v _ - .. - ^esign Method l-lyd Into _ SBtJH Rainfall type TYPEIA _m .._ ..... . _ . _ _. ._ _ _ _. 14.40 min >'eakin actor __ _ __,....484.04 _ ..__..... A raction ~oeff _...__ _...... _ . _.........._.....ww~__.._._......... 0.20 _.. Pervious Area (AlVIQ 2) 4.12 ac QG1A _.... 0.4t? ac _..._. _. __ ._.... .. Pervious GN _ QC Ct~ __.. _..._ ... .r.. _ ..~ .._ ._ ._ ... 0.00 -- -- l'ervit?US TG 54.43 rnin Q~ TC __ 4.44 tT11n Pervious ~N Calc _ . _ _ _. __ _._ .. ~BSCrlpti~rl . _ ........................... SufaArea rUl7 Cn I-lerbaceaus 4.08 ac 87.44 impervious surfaces (fiavements, r~spis, etc} 0.04 ac 98.04 Pc.rviaus Compcasited Clef {AMC 2} 87.11 _ ..... _ _ PerviQUS T~ Calc . __... Type [)ascription Length Slope Coeff w... _............ ....._._....... _~._.. .. _. . . Mist TT _ . .. .. ., ._..---..._..._....._----_.._.. _ _...._~ ....... _ .. _....~._. . r...........~ ............... Sheet Smaath Surfaces.: 0.011 25.00 ft 20.44~fa 0.0114 ._M........_. _._. _.. 2.04 in . _. _..- -------..._._..---- 4.24 rnin ~. Sheet E~ense grasses :0,24 480.00 ft 3.04°l0 0.2400 .......2.04 in _ _ 53.83 min Peruieaus TC 54.43 min ~l~ 3 POST-QEVELC?P_MENT STQRM EVENT SUMMARY _.. Event Peak Q ~cfs} teak T (hrs~ Nyd Vol 4acft~ Area {aG) Mfethcxd .. . Raintype _... .. _._ __ _ 6-month 01.3386 7.83 {1.1178 1.3Qd0 SBUH _ TYPE1A _. _. _._ _. 2 year 0 5991 7 83 Cl 3922 1.3dQ0 SE3l.li-[ TYPE1A 10 year _-d 9235 7 83 __ Q 2999... 1.3010}(} ~ SBUN TYPEIA _... 25 year 1.d84~ 7,83 [?.3539 _1.3(7[ifl -SBUH _.._ , v. .. ........ . ~. TYPE1A . . ...... _ ....,.. 1d0 year 1.2418 7.83 .4479 1.30Q01 ~BUH ~_.. w _.._..... . _ Tl`PE1A . ..._ . . POST-DEVEi_OPMEhtT AREA SUMMARY _._. __ _ ___.__._....__ _ ~._.w_ ___ _.... , .. esi n Method ~ SBUFi Rainfall type TYPEIA H ti Into y 1 0}.0)0 miry Peakirwg ~actar _ .._ 484.40 _ Abstraction Gaeff _.. Q 1-erviQUS Area A'MC ~ ~ } d,~ld ~~ o~'A ._ _ __ ...... .__.. ... ..._..... . .:. .. _..... ..:.._. 1.30 a~ er~o~u~ cN d,DO i7C cN .~~ :_ _.. .. . .~. _ n.~ ..._ _ _. _. . Pervisaus TG O.QO min tlC TC _. 0.56 min __ _ _ . _ Directly Connected CH Calc _.... __ -.. _.. Descriptinn SubAre Sub cn lmpervinus surfaces (pa~rements, roofs, etc} 1.301 ac 98.04 __ DC Composited CN (AMC 2} - __.. .. 98.001 _ _ .._ ~w.__._~_.. _. Directly Connected TG Ca[G .. ._ _ _. _ . Tyne Descriptit~n Eength Siope _. Coeff Misc .. TT Sheet Sm~aoth~ Surfaces.: 4.011 3(1.44 ft 1 C1.dd°io _ r .. . . _.. _ _ d.d1 I Q d.d0 in _ O.Od rain ._ . _ . .~.. _.._....._ _. _.. _ _ _ .. Channel {interm} Concrete pipe {n-01.012) .200.00 ft 2.001% d.0}1201 _ _~..... 0.56 min _.._......_ directly Connected TC Q.8~6min l 6/~ a NYORQGRAi'H PL03T5 PRE ~ PQST-DEVELt?PMEhIT Z YEAR HYQRQGRAPFI Start of live s#orage: 3301.0]01 ft _.. Event Match Q (cfs} Peak Q (cfs~ Peak Stg ~f#} 11x1 I~cf~ Val (acft~ Tlme to Empty ~ year O.Q980} 0}.019901 332.1232 2$65.71 (1.Q6~8 _ - - 39.33 2 _yet~r Hy+ti,~+~'~~lsla Pl~+t 01.5 -- -- - - _ ~_ ----- - -- -- a~-~2ye~ro+E • - Q.4- ---- - --- -- ----- ' - -- - ~ ' 01.3 ------- --------~--- - --- ~--'- ------ -- -- ~-- ,-- --?--.--~--~ -- -- -- Q.1 -._-...~. a ~, r o ~ ~ ~ ~ r ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ Q ~ ~ Q r r r r a-- n- r +'V ~ N C'V t-~t ry Ti+r+e in Hrt+r;,~ PRE ~ Pf}ST-DEVELC?FAAENT 74 YEAR HYbR03CF2APH Stark of live storage; 33t~.0?01 ft ...... w_.. ~,-... ----_.r.-~__._...~_._._..~.. _....._. ..._ ......._._.._......._ ._.....~..._ .. ~. - ...... W...._,m,.....__.,.._- .-....---- . ............_....-.......... Event Match Q ~cfs} Peak Q {cfs} Peak Stg (f#j llal {ct~ Vol {acft} Tirne tv Empty 101 year 01.4183 01.4179 332.4328 3476.8E [J.t1798 42.17 '14 year H~+r!'t+~~'g~l~l- Flat ~ ----- ---------- --;- ._,__,~.._-_ -~--------~----- - - ~;~.~9t1-,rePr-tint:- - ~a 0.6 .a a.a - a Q n r' c~ r~- o t-a r-- o ra r.. ~ c7 n- +~ ~ a~ cs ra td n c~-~ R ~ m r~ ~ ,n ry C+? V7 4'D t''? r O ~ 40 ~J i Sa? r- e:.r CC? {O 41? (~7 +r- Q {p 40 eJ'? C? - O CO [6 4~ C"'7 C7 r f'*I l'M d- V? ®f? 4@ P+ ~ L'*) G^ G _ M {''} d- VA 4°eP {p h- {~ r?a Ga Q C+t C'l 7' r r r r r r <- ~r- 4'+1 t1d {'+1 C'*~6 CY 4'Y T+t71~ Ill Hoc+r~ AR(~ & PQS7~DEVELQPNtEI~T 10U YEAR FlYDRf)C~RAF~FI Siart Qf live storage: 33(1.00 f$ .. .................... _ ._ vent Match Q ~cfs) Peak Q {cfs} Peak S#g {fty Vc~t (cf~ 1fr~t (soft} Time to Empty 100 year Q_66fi7 O.B660 .332.B451 4377.4(1 0.1005 42.fx7 '140 year HY~frot~'.-~~af1 Plat ~.. ,f'" ~ z+r' ®10a dear' ouY .y 0-. rv o ra rY ~ to N- o n-, r~ art ra c ° o r7 r•. !~ ~ ca ~ ~ " - ~ w s ca va cri m c c? u~ m T- cw ~ ~ ` - +~ ~ r- to to c~ ~ ~a a - r o o s- c~i a i ~a- r cra c~ r- ~ as ~a o ~ - av -~ ~ ~ , a r , ~ _ ~ ~ t-- -r ;a cc a~-. ~ 4ai cri o +:,i r.~ ,~- Tirne in Hours c~a cv cv a-*r cv Stage Storage Rating Curve 330.OOOf1 ft . O.C100tJ cf 331.6Q00 ft 1952.8464 cf _. _ 330.1000 ft :...$8.6819 cf 331.70(10 ft 2115.7571 cf 330.2000 ft 181.4756 cf 331.8000 ft 22$4.1316 cf 330.3000 ft 278.4531 cf 331.90(10 f$ 2457.8419 cf 33(}.40(10 ft .379.6864 of 332.00{10 ft 2636.9600 ~cf . _.. _.._ _ . 330.5000 ft 4$5.2475 cf 332.1000 ff .2821.5579 cf 330.Baf100 ft :595.2084 cf 332.2(]00 ft 3011.7076 cf __. _. _ _. 30.7004 ft 749.6x411 Gf 332.30011 ft 3207.4811 cf _. __ . __ . ..._ _ 33{1.80£10 ff 828.6176 cf 332.4000 ft 3408.9504 cf 330.9040 ft 952.2099 ~cf 332.5000 ft 3616.7875 cf 331.000[1 ft 1080.4900 cf :332.60[10 ft 3829.2644 cf 331,100L1 ft 12fi 3.5299 cf 332.7000 ft X4048.2531 cf r . ....... _._.. __..__._~ ....................... _....._..~....._ __.. __._..._.. . 331.2000 ft :1351.4016 cf :332.8(100 ft 4273.2258 cf 331.3000 ft 1494.1771 cf 332.9000 ft .4504.2539 cf _. 331.4000 ft 1641.9284 cf 333.OQ00 f$ 4741.47OQ Gf 331.50(}0 ft 1794.7276 cf 333.1 f34Q ft 4984.7659 Cf -._....... ...:-3c ~/~