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Home My WebLink AboutDrainage Reports - 08/05/1995May 16, 1995 Revised June 29, 1995 Mr. Glen Schlueter Stormwater Utility City of Fort Collins PO Box 580 Fort Collins, Colorado 80522 Dear Glen, Attached is the Final Storm Drainage Report that accompanies the construction of 3 duplexes located in the Old Town drainage basin at 605-112 South Meldrum Street and 627-112 and 629-3/4 South Sherwood Street. All design is in conformance with the latest edition of the City of Fort Collins' Storm Drainage Design Criteria and Construction Standards. FINAL STORM DRAINAGE and EROSION CONTROL REPORT 605-112 SOUTH MELDRUM and 627-112 AND 629-3/4 SOUTH SHERWOOD CITY OF FORT COLLINS, CO May 16, 1995 (Revised June 29, 1995) Prepared For: City of Fort Collins Stormwater Utility PO Box 580 Fort Collins, Colorado, 80522 Prepared By: Structured Engineering 31 8 East Oak Street Fort Collins, Colorado, 80524 Phone (970) 495-0810 Fax (970) 224-1314 ,:, .., -: 0 II m <":) ~ ~ C ~ C C a ... .. ~ ~ Vicinity Map INTRODUCTION FINAL STORM DRAINAGE and EROSION CONTROL REPORT for Duplex Construction 605 Meldrum; 627, 629 Sherwood June 29, 1995 Three duplexes are proposed for construction on three separate residential lots within the Old Town Drainage Basin between Laurel and Myrtle Streets and Meldrum and Sherwood Streets. The new addresses will be 605-112 South Meldrum and 627-112 and 629-3/4 South Sherwood. 605 Meldrum and 627 Sherwood each have an existing residence, while 629 sherwood has two existing residences. This report sums up the analysis that was undertaken to determine what, if any, impacts the proposed construction will have on the historical drainage patterns in each area. The report will address the following: 1 .Site Descriptions 2.Storm Drainage A. Design Criteria 8. Hydrology C. Conformance With Existing Master Drainage Plans 3.Erosion Control A. Erosion Control Measures It is intended that the recommendations found in this report become an integral part of the design and construction phases of the project. -1- 1. SITE DESCRIPTIONS The property at 605 Meldrum is also known as Lot 1 5 of Block 86 of the City of Fort Collins. The area is established and mature with landscaping and older houses and garages. The duplex site will be in the back half of the yard, and little work, with the exception of a water service installation, is expected in the front half of the lot. Construction will be tight inside the lot lines, and several trees will need to be removed to allow room for the duplex. Drainage is at less than 1 %, generally from the back of the lot towards the front. An alley in the back will be paved full width (as obstructions allow) from the duplex site north to Myrtle Street as part of this construction. Presently, this alley consists of a surface topping of road base, with no well-defined crown. The paved alley will have an inverted crown with a 2' drain pan down the center. There are no pronounced natural drainage features on the site. Existing offsite drainage improvements consists primarily of curb and gutter along Meldrum and Myrtle Streets. The property at 627 and 629 Sherwood are contiguous and is owned and being developed by the same person. As such, the two lots were analyzed as a single site for the purposes of this drainage report. The property at this site is also known as Lots 9 and 10 of Block 76 of the City of Fort Collins. The area also is established and mature with landscaping and older houses and garages. The duplex sites will be in the back half, or western part, of the site. Again, with the exception of a water service installations, little disruption is planned for the front half of the site. Duplex construction will be tight inside the lot lines, and several trees will need to be removed. Drainage is at less than 1 %, generally from the back, (west) of the site towards the front, (east). An alley along the south lot line is presently paved, and the alley along the west lot line will be paved adjacent to the building sites to the existing paved alley along the south. The alley will have a normal crown at 2% to 4%. The alley that is paved has an inverted crown with no pan. the only other existing drainage improvements at the site is curb and gutter along Sherwood Street. There are no pronounced natural drainage features on the site. The soils group making up both sites are primarily ML and CL-ML according to the Larimer County Soils Survey by the Soil Conservation Service. -2- b. STORM DRAINAGE A. Design Criteria The City of Fort Collins has prepared a Storm Drainage Design Criteria and Construction Standards (SDDC) which provides the basis for the analysis used in predicting storm runoff and the recommended drainage improvements. B. Hydrology The Rational Method is used to predict the amount of runoff. The 100-year return frequency was used in this report to predict major peak discharges, and 2- year storm is analyzed to predict minor flows. C. Conformance With Existing Master Drainage Plans The Old Town Master Drainage Plan was prepared for the City of Fort Collins by RCE Engineers on January 7, 1993. RCE assumed a runoff coefficient of .60 for the area proposed for construction of the duplexes. Stormwater Utility has said that if the developed percentage of imperviousness of a site is less than 60%, then on-site detention is not required. Calculations included with this report confirm that neither site has an imperviousness percentage greater than 60%, hence detention is not analyzed nor provided. EROSION CONTROL The SDDC outlines the causes and results of soil erosion due to wind and rain. Because each site is less than 1 acre in size, they are exempt from wind erosion control requirements. The SDDC shall be considered in it's entirety for guidelines to aid in preventing rainfall soil erosion. The SDDC will govern requirements and specifications for earth moving at the construction site. A cost estimate for erosion control measures is included with this report. SUMMARY OF STORM DRAINAGE AND EROSION CONTROL MEASURES The following is a summary of the storm drainage improvements and erosion control measures that will become part of the Greenbriar Village Second Filing construction. -3- GENERAL EROSION CONTROL NOTES 1. Keep disturbed areas to a reasonable minimum at any one time. 2. Stabilize all disturbed areas. 3. Keep runoff to velocities not causing erosion. 4. Provide diversion channels to direct runoff around and away from disturbed areas . 5. Keep all cut and fill slopes stabilized with terracing or scarifying furrows perpendicular to the slope. 6. Protect stockpiled materials from wind erosion. Stockpiles are not to be higher than 8'. 7. Permanent ground cover is to be established on all disturbed areas. Areas to be seeded which have been compacted by construction activities are to be ripped or otherwise loosened prior to seeding. 8. Provide a temporary cover crop · or an application of mulch to areas to remain unseeded greater than one month. Disturbed areas which have topsoil removed may require an application of fertilizer prior to temporary seeding . 9. Inspect, clean and repair all erosion control measures the following work day after each storm event. 10. Additional erosion control construction details and specifications shall be taken from the City of Fort Collins Storm Drainage Design Criteria and Construction Standards. -4- June 29, 1 995 Mr. Glen Schleuter Stormwater Utility City of Fort Collins PO Box 580 Fort Collins, Colorado 805 22 Dear Glen, Attached is the cost estimate for erosion control measures associated with construction of duplexes at 605 South Meldrum and 627 and 629 South Sherwood streets. have. 605 Meldrum Perimeter Barrier -224 If @ $2.50 /If $560.00 Alternate; Seeding -.22 ac @ $1300/ac $286.00 Security required = $560.00 x 1.5 = 627 Sherwood $840.50 Perimeter Barrier -185 If @ $2.50 /If $462.50 Alternate; Seeding -.22 ac @ $1300/ac $286.00 Security required = $462.50 x 1.5 = 629 Sherwood $693.75 Perimeter Barrier -161 If@ $2.50 /If $402.50 Alternate; Seeding -.22 ac @ $1300/ac $286.00 Security required = $402.50 x 1.5 = $603. 75 Total erosion control security deposit required: $2,138.00 Glen, please feel free to call with any questions, comments or suggestions you may Very Truly Yours . Joseph P. Marcisofsky, P.E. Structured Engineering I MYRTLE STREET LEGEND ~~ ~ Is-"\ 0 --r-1-- --=-·,-,-~~~. @BASIN DESIGNATION AREA (ACRES) =-· ,, '-\ ·, \' ------.. ·---~-----1 ff1 .... ____ _ '··, .•. / '"9a_ ·-·,-:: 0 DESIGN POINT ----,;.. .. ~~J ~~~ \ ~· !1· ~-11 -: ·~~~\":\ ~,-,, ;;,: t: /J~~ ,-1-w w Ct: 1-()1 NEW DRAIN PAN SEE DETAIL ANO PROFILES SHT. C2 /[: '!' ,. f:. I]/ 20 LF EROSION CONTROL FENCE AT P.L. SEE DETAIL THIS SHT. 6\:. F.F. 4999.68 -·-19.99 __ _ 603 MELDRUM F.F. = 5001.09 L => et: I 0 al i -1 I ~ w J d, -sr 0 I -----·,,, r1; ,,.-··-' .____,_ ' \ 1 L ./------------·: ~-/ . \ : \ l ~-/ \ '' ~JV \ i v' ! , ., 'NA ' . --~-> . j \ ' (41 l {.-----. ---~ BLOCK LL \ i ~,'(...J;'-', 50 LF EROSION CONTROL FENC\: ! _ _ _ I I --.:--~' .,. ,., _y,;,_.,. .··.,.~;, ···-·m=,N·<•:•·•"'·•··•~•--•.z.,.·,•.··•.~---·,.... -:~.· -~--~~-:. I.-.-.-----, \ - -\ 7 I-I -99 --\ / . ,-•. \ i =:> ·----...---~ -\ : I 3 . p,:~J. gg,'o PROPOSED/DUPLEX l:-~,l9Y) . / ,,/ \ ________ '·, ; Ss ~ 605 1/2 S1 MELDRUM \ '( _;~·•·. :· • .-,_,,,.,,,.. 605 MELDRUM ·--... .·.·•. '<'·,·-::-;-. ·. • : l I · ::.~-1 , · · . · <v· ,· • · ---•·~--r-~ ·· • MIN. T.0.C. = 5000.4 i<' .,: .· · .Ii ; ·• . · · / F.F. = 5001.30 !: i ·,1 !·· . l : ________ .. .,.... _-,-__ ..,...,, _...,.. 7 -·· .. ·. 99.9 LF EROSION CONTROL FENCE J I ~ 711 · !l ll · · .. -J --(('"'~~/: .· .•--: (:--i-, tfv. \: .. 1 ~--~_:.::-:-_;-,o::~--<.'.<•.:·~·:·:~~1::·, .. 2:--:'::--·-,_c,::<·: .. ::P ;}\,_: ~ ~-, ,. . . ~-...-· • r . . . ' Ir'' ·-~ • ' ' .; ,-.,.._~ ;, ·k"''~•· ' ' ... \ ... .....,. I I ··-"-•I ' ' . . . I ; '\ • . ·•·"'':--=-._ .. ' ~--..----_.. 'f,., .:-! : -· x---_L ~ 4~~;,:Jr~~ >=' ("''>.I' ~_,9 Cc, '-·-·~\.~ ,-.,g-;,r--~;;-;.:. . . .\· •i'\. . ·,r-:---::,_Vk_"..i.. --._ -· --------7 ·-,, '·, ,, ', ~ .... /..'°""\]\· '-· ";-, •,. . ,--:::,._j t_ d ! ,-, l < ,, I @ />,V· h. . "-<-••. , __ I . . >,,; -, ""'· ~,-, ' I I ---~ll__}(J;,,...., __ "'-\ : r_ L..,._ la'.! I'~) fr.,.,. ~\ -~-l: •i j .245 . ✓::=· , '-P __ ,.. · .. . I j j \ \t-,, . _J;\ ; i I I . ,1\ ,, ... ✓~~~} •• ~~--••• ,-. .. ., I -~---... ~--~_J __ ---W-,------I --~ ~ ':t~ ·r-......... , -: . .. .... .. . . . . . : ... . . .. . . .. . . .. :, .,n, L\--· ;,~ ·-:·::-'_;:~~ ··•. -.;_ :_.-~. :~·\{_:_· :· ~ ··:··r,1_ t ___ J I / ~ BASIN BOUNDARY USED TO DEVELOPED BASIN DETERMINE HISTORICAL RUNOFF 104 LF EROSION CONTROL FENCE ALONG P.L . , .. .. I r·., n (·:t7 I '-,, ', ... BOUNDARY ·;., 6059991 /2 s. MELDRUM 609 MELDRUM F.F. = 5002.01 ,:n <Jl •,)) -si' -1 r-w I I ~ ~ ~ SEE SHT. C-3 FOR ALLEY PROFILE AND CROSS-SECTION BASIN BOUNDARY USED TO DETERMINE HISTORICAL RUNOFF :i: . I I I I I I · 1 ·r '.L . I I I I I I I ·1 · ... · l . •. l 01 [... . : : . ·_ ·.· 85 LF EROSION CONTROL FENCE AT P.l. SEE DETAIL THIS SHT. ,-':;;~-,\ .r~;:s\ ... ~-~\ PROPOS 627 1/ M I.. { "I : .· ~ . t 1, , -~ Sf I >~~ff~'l:_ ·-• l\..i ~.1 ,,( I ~f }~ --.].J{._y . --~-,_ ( ..,.· --,..,1 ( (" ~.::--~-~~ \\ \~ \':"-·\· ·•·--~ . fa....'\--50 LF EROSION CONTROL FENCE ~-~ -.\N, .... ,,r t-LJ.., \~~-,\ 1~-I .·l I,· i ·~ l 627 SHERWOOD ·, .... · . •. · \ 1: -~\ ,i,i,,_.. _,;,;. .. --~""' t,/,, .. ·,1ri ~ -I' .. ·I \\ )/ V; . ., . ' -~1 •. JI . -l , . = -...:.--/ if.,,;: r · .. . -\ ,--. >,.. . '. ..-,.~: .......... :::--.::---~-. . -·-1 f?1) ((·~;' . \\ w.~ '\ ::-:\,. :.\; ''f~-~ I t i ~,--.-YI; \ \ .. ~ I J -t I I I r\;J x .. I] j \,I '<'· ,-"'A i > I . _i_. ".:::::~ _·-<-mt, . "" ,, --Jr~.k,.___-:t· ~ \,"(.1 --< _ _..-;. 'Sf._,.~ ),,:::'"-'-----=; )\<:--.,_.., '-.;,..,j ~----i, ·;1.>--. 't \. ,, i~--\j( I ~\.if '··· \,,,.· __ ,,,,, , X I ~~~L '7 '·7 .__ I ..... ., \ __ ,,~_,/ :c~ .... .....,c-,:"1 I j_ . ···---.• ---e:r \---~J-~ ~::~_-=-~::~<~--~./J,j-L:-~fL-_._.._. .... GARAGE I -:--,..'/"(L;,, -~~.t _f . . l . . l . . .. ·r/_: t · t'-·lt (' ---· .-. \~· \;,-:.._ 0.3 . 6:!:iR~~~sEo ou~&'\ J, I · 45 LF ERos1oN '\l.;F,: , ;• J -f'\,· ·. \. ,,,"\) ( <r· "-~-1~ • \I \('-\>--._ . ·-~ 1!~ u \. I,...\".~\ ,\ 629 SHERWOOD •s· • ~~ · I 'SJYI -~ l,~C:.,..-;[J 4 r ,. ·;.l'<~:i-..,,."\ .'\J'\~---,, .. {\ I ,. I 7~:_l\ I t.:'.i \ I ,.:\. ,t··\1. U1 ~~~is'oC"~E~~~. ih · I \ j ~ ; 11 7: ;;{r--,, " . I I~"'"' ' t ..-,-, .. ,.. . . -MIN. T.0.~: ;~E;:~oo , ~:ONTROL FENCE ,------I ___ .,,,.,,, ..... 629 1/2 SHERWOOD I ....... " . ··~ .. ~,. •'-I).· .. , . . . . . -.• J #'(,;, ':>~' / \ illr"· .. -~·· /'..: -~ .-~ -'~ . . . .. . : / . . ____ .. ! I. \ · ... · . -1 ,., ._.,_, ... , . .---.-.. 1-·. _:.:.: :..._•·-=-·~ .·~ 1.Jl~kd-f I -'----............._~-== . n . -· ·\. · .. l . l I . . \ -----· .__,, ll~r,i--,-----------------,lji\_ ... -~------·-·-) \ . . X fs• ~~ ~ · ·"-.,·/ ~~s;. . ...._. --.--.-· .. ,..,:L.~ ---·-d,-.·-·-.···.c;:;\l.~-··-· .... _··-. --. --.-i\.,l\Ji, -_---··.·,---··//· ___ ---·0·4·· _·-.-~ ·-·~..;.L_ -/~ - -=.,.---· ~ ·c"?· ~ ~-"--~---· ----. ---···.··~~\},:..,,..4,/:~ ----·--~ ._ -· . · . -~ •,; . ./ ·. ' I _./· . . . \ . . ,-,:_. · ·,~ )1' l'/ :L.,-: . ·,, __ . . .... ~ ,,_,.) -\ ,· , T . ·,. ... . . ~-. --=•-•!'. ·"· I/ . /· . . ~~-..1.,-' ·•~ ., \ .,,/ EXIST. iASPHAL --·. . . . :"'\.l . . ··-·-.J\ --, i 1~i:-. · =,on·,._... , , · • \ . -_').11_..,..•,s;,k----x· w w ' ' < :_···:.,_ [66 LF :RO-::O-N __ -_-_-_·__,-t"""□,...■""1---· ::;~ .... ,.__ -----~~~ CONTROL FENCE. I I 629 31/4 S. SHERWOOD ; I I • I I I 627 1 /2, ~.5002 I 0 C'·· V1 <[ ,j -7 I I I I -+ I I I I I I _J_ I J 1-w w 0::: I-(/) 0 0 0 ~ 0::: w I (/) I I-=> 0 (/) ( ,,,.,,.,, 1-1-1- "'"'"' ......... l: ::c :c ''"'"" 0 00 !11 00 -N -N., ., ., ., ---NNN NNN ,/ £ ~G~~l ~ -= io lw-~. ~ ' ~~(.{Wcc,,.Q (,2.1 •. G, 2.. C\ t,"'t \ <:,-\-Slu.w ooL £'i-1S \-So, A\\e\ f--1-I~+ luc..l "-) 81'.;,-t A,c,rL .1),,~~ ("' I <,A-t.., '!12 <:; · C,--f-\S 'i '"-'\'C.... f\e..,._, \).,f le'f-Q.':;> {\e~ A\\~ {\el.A) f C,Vt..;1.6 Cl -(Zoy. "l) 2~ L£,~s .. ~-=- Z So ..,, So -= \ -Z.. Soo Sf \ \O '"?-'30 2. 50 ')(\-0 41.,5.\-"'\';I<\ \oo~ lo zl-'f -: 250(110) -:. -z 7 ?CO S' r:: \ 5'DO ~~o 0 0D s. <.. (,. Z-to \5;,L\ l $' cC\ :,00 -- -rw --;,oo '2.Soo \ 400 74-Z Z,f<.,O 210 2;-ez.~ loo o \4. 4. 0 I(, 308 SF , (o l~ = l~1oi -Sic/o ~b )k,~~ ~\c.R_. 271500 l,o~ ~✓v """---:: 1 z. 0 /o l..,z1 :_ ~l'\ Sluwo~J2._:: 1oo/~ ~ 0 ~ v\)e-L~.,v ~ -: '54°(-> G<-1 ~ 1..1."'l S ler ...... ,..y= ~:/1°/13 605 MELDRUM STRUCTURED ENGINEERING PROJECT NO.: 9510 HYDROLOGIC CALCULATION WORKSHEET BY: JPM RATIONAL METHOD PROCEDURE DATE: JUNE 29 '95 ======= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = BASIN DATA I INITIAL/OVERLAND TIME I TRAVEL TIME I TOTAL I Ti I Tt I TIME ----------------------------------------------------------------------------I -------------------------------------------------I -------------------------------------------------------------------BASIN I DESIGN I RATIONAL EVENT I AREA I LENGTH I SLOPE I Tc I LENGTH SLOPE I VELOCITY I Tt I Tc DESIGNATION I STORM I COEFF COEFF I I I I I I C Cf I acres I ft I % I min I ft % I fps I min I min ======= I = I ===== ===== I ===== I ===== I ===== I ===== I ===== ===== I ===== I -----I -----[ENTER! I [ENTERI I [ENTER! [ENTER! I [ENTERI I [ENTER! I [ENTERI I I (ENTERI [ENTERI I [ENTERI H605 I 2 yr I 0.32 1.00 I 0.287 I 220 I o.5 I 21.2 I I I o.o I 27.2 H605 I 100 I 0.32 1.25 I 0.287 I 220 I o.5 I 24.4 I I I o.o I 24.4 D605a I 2 yr I 0.95 1.00 I 0.086 I 125 I 1.1 I 10.0 I I I o.o I 10.0 D605a I 100 I 0.95 1.25 I 0.086 I 125 I ,. 7 I 10.0 I I I o.o I 10.0 D605b I 2 yr I 0.54 1.00 I 0.245 I 220 I o.5 I 19.5 I I I o.o I 19.5 D605b I 100 I 0.54 1.25 I 0.245 I 220 I o.5 I 14.8 I I I o.o I 14.8 627. 629 SHERWOOD STRUCTURED ENGINEERING PROJECT NO.: 9510 HYDROLOGIC CALCULATION WORKSHEET BY: JPM RATIONAL METHOD PROCEDURE DATE: JUNE 29 '95 ======= = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = BASIN DATA I INITIAL/OVERLAND TIME TRAVEL TIME I TOTAL I I Ti Tt I TIME I -----------------------------------------·--------·------------------------------------------I ----------------------------------------------- ---------------------------------------------------------------I ---------------I BASIN I DESIGN I RATIONAL EVENT I AREA I LENGTH I SLOPE Tc LENGTH SLOPE VELOCITY Tt I Tc I DESIGNATION I STORM I COEFF COEFF I I I I I C Cf I acres I ft I % min ft % fps min I min I ======= I -----I -----===== I ===== I ===== I ===== = = = = = = = = = = = = = = = ===== -----1 -----1 (ENTER) I (ENTER) I (ENTERI (ENTERI I (ENTER! I (ENTER) I (ENTERI (ENTERI (ENTERI (ENTERI I I H629 I 2 yr I 0.40 1.00 I 0.631 I 220 I 0.8 20.9 o.o I 20.9 I H629 I 100 I 0.40 1.25 I 0.631 I 220 I 0.8 17.9 o.o I 11.9 I D629a I 2 yr I 0.95 1.00 I 0.100 I 110 I 0.6 10.0 o.o I 10.0 I D629a I 100 I 0.95 1.25 I 0.100 I 11 o I 0.6 10.0 o.o I 10.0 I D629b I 2 yr I 0.59 1.00 I 0.554 I 220 I 0.8 15.2 o.o I 15.2 I D629b I 100 I 0.59 1.2s I 0.554 I 220 I 0.8 10.8 o.o I 10.8 I RUNOFF SUMMARY NOTE: MINIMUM VALUE OF Tc IS 10.0 MINUTES BASIN DESIGN DESIGN DIRECT RUNOFF POINT STORM Tc AREA COEFF RODUC Q mins acres C*Cf C*Cf*A in /hr cfs H605 1 2 27.2 0.287 0.32 0 .09 1.55 0 .14 H605 1 100 24.4 0.287 0.40 0.11 4.60 0.53 D605a 2 2 10.0 0.086 0 .95 0 .08 2.50 0 .20 D605a 2 100 10.0 0.086 1.00 0 .09 7.40 0.64 D605b 1 2 19.5 0.245 0 .54 0 .13 1.85 0.24 D605b 100 14.8 0.245 0.68 0.17 6.00 0.99 H629 3 2 20.9 0.631 0.54 0.34 1.80 0.61 H629 3 100 17.9 0.631 0 .68 0 .43 5 .50 2.34 D629a 4 2 10.0 0.100 0.95 0 .10 2 .50 0.24 D629a 4 100 10.0 0 .100 1.00 0.10 7.40 0 .74 D629b 3 2 15 .2 0 .554 0.59 0.33 2.10 0.69 D62 9 b 3 100 10.8 0.554 0.74 0.41 7 .00 2.86 EFFECTIVENESS CALCULATIONS 1-----------------------------------------------------------------~----1 I PROJECT: ~1/i V\Ae\J,v""'r (,, l, 1/z l, 2.7 ¾ 5knv o .J. STANDARD FORM B j I 'J 1 I I COMPLETED BY: .j?~ DATE: 5/\'r )a... 'f I I ___________________ I I I I Erosion Control C-Factor ?-Factor I I Method Value Value Comment I I ----------------------------------------------------------I iZ Ov'l l..-< '\~..Q < {2.,:,u r. J '{2.7~<:. ~ Wc..li,s 5,1~ f4v1.'u,___ cs+. 4~~s· I ,oo , 0/ / ,oo ,0'8 I I I I I I I ----------------------------------------------------------------------1 I MAJOR I PS SUB 1 AREA I i I BASIN (~) BASIN (Ac) CALCULATIONS I ---------1 ------------------------p~:~~~:-;~:io---------------------DC:.o~ 17. y, ,on ... 5, U-~: Zo % U& c :. , s (o,l r, -z..( r')::: 1 2.1 w t'J. P-: , ~,( I ) + I 2 (, 5) :: , <=t 0 I €ffed-,~~S)-:. ~-(,z1;(,9~j/oo~ q Df.osb 72 ,7 I -Z15" 1&,Q[>.v ,~(J /&u,lf;,1ry:J1i<:>-xiL. Sod 1s"'/. Sr r r r~ ,_ ,('J.,7..;:, 6 l-c;-/iG..c;~ ,. 45 -"/o I I wt'Ji ( ::'. 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I/-0i ).<'f<=rj l"o ~ S 3:/. > 74,9_-f I< I ----------------------------------------------------------------------1 HOI/SF-8:1989 C ' I \__ RAINFALL PERFORMANCE STANDARD EVALUATION PROjECT~-~;-si~-;;1j:::--~~-;y;z;~3/4--si:~:::::i~----STANOARD-FORM_A_l I I . l !COMPLETED BY: }pM DATE: 5CJ:l°I) I 1---------------------------------------------------------------------I IDEVELOPEDIERODIBILITYI Asb I Lsb I Ssb I Lb I Sb I PS I l=~~~~=:~-l---=~~=----1-~:=~--1-~~~~--l--~~~-~l~~==~~-1--~:~--1--~:~--l ID <oo~ C\ I Mc,Je,~ I . Oq?.. I 5 S' l ,. t,1, I sr I /, g 117. g l ID (,oS"b I MoJ,.....,-,bl z45" I z:So l 5 +zso +-:-s---··f -Jz. z. +--1 , I I ' I I I I . I I I I l I . I I I I . I I I I I I I I l---------------------------------------------------------------------1 ~mT /~F-A:1Q~Q