HomeMy WebLinkAboutDrainage Reports - 08/05/1995 (2)May 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
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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 (/)
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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
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