HomeMy WebLinkAboutDrainage Reports - 02/25/1993Final Approved Report
�_ Date r�3
GILSDORF GARAGE
FINAL DRAINAGE REPORT
FEBRUARY 15, 1993
STEWART & ASSOCIATES, INC.
103 SOUTH MELDRUM STREET
FORT COLLINS, COLORADO 80521
303/482-9331
7/7i
s m �urul�r
STEWART$,ASSOCIATES
Consulting Engineers and Surveyors
February 15, 1993
5 rm rw u,atte-
St-erm--Bra•itt " Ut i 1 i ty
City of Fort Collins
P.O. Box 580
Fort Collins, Colorado 80522
Gentlemen:
The following is the storm drainage report for Gilsdorf Garage, 1111 West
Mulberry Street. The legal description is Lots 5 and 6 and Part of Lots 3
and 4, Block 1, City Park Heights, Fort Collins, Colorado. The 0.76 acre tract
is in the Old Town Basin.
The tract has the existing automotive repair garage and an existing single—
family residence. The site is being reviewed because of a proposed addition
to the garage and expansion and paving of the existing gravel parking area.
The site is split into two basins, with the north half of the site draining
northeasterly to West Mulberry Street being Basin "A". Basin "B" is the south
half of the site and drains southeasterly to the existing alley. All of the
existing improvements are located in Basin "A" except a shed which is to be
removed. There is no additional hard surfacing proposed for Basin "A".
A 1680 square foot addition to the garage is proposed for Basin "B".
The expansion and paving of the gravel parking area containing 5988 square
feet is also proposed in Basin "B".
To detain the difference between the 100—year developed storm and the
two—year historic storm, 1740 cubic feet of detention is required. The
detention will be in the southeast corner of the proposed paved parking area,
and the discharge will be metered by a three—inch diameter P.V.C. pipe through
the planting buffer in the southeast corner of the parking area. Eight —inch
landscaping timbers and earth landscaping strips will back up the runoff from
Basin "B".
The runoff from Basin "B" will drain easterly in the alley to the west
curb and gutter of South Shields Street and then north to an existing inlet
at the corner of Mulberry Street and Shields Street. Basin "A" will drain,
undetained, easterly in the Mulberry Street curb and gutter to the existing
inlet at the intersection.
James H. Stewart
and Associates, Inc.
103 S. Meldrum Street
P.O. Box 429
Ft. Collins, CO 80522
303/482-9331
Fax 303/482-9382
Drainage Report, Gilsdorf Garage
Page 2
The City of Fort Collins is requiring the extension of the asphalt paving
of the alley from the existing 7-11 Store paving west to the west side of the
driveway from the alley to the Gilsdorf Garage. The alley paving will be
eighteen feet wide with an inverted crown. We are requesting that no concrete,,)/
pan be required for 140 feet since the existing paved alley has no pan. 9
The runoff from the portion of the alley being paved is not being detained.
The proposed paving is downstream from the proposed detention pond.
The storm drainage calculations, detention pond mass diagram and the
grading and detention plan are enclosed as a part of this report. If you have
any questions concerning this plan and report, please call.
To the best of my knowledge, this report and the design of this drainage
system are in compliance with the current City criteria.
Sincerely,
Richard A. Rutherford, P. E. & L.S.
President
jrr
enclosures
UM
STEWART&A SSOCIATES PH. 482-93311RF FAX 482-93C820LLINS, CO 80521
Consulting Engineers and Surveyors
By: R. A. L, Date: 1 f / zs / 9 z Client: G t Ls D o 2. F () A e H H,c Sheet No. _ 3 of Jo
Project: / n7s !S-9 ( Aun PA.PT of Lois 3Z¢ 4 (--/.—y PAef- /-'_ --s
Subject: 57'oP,tit-DR A/,VAC-9 CALcu1-Ar-10NS
AP—C—:A = 33.09/'- S,✓ = 0-7(, A,,
B As /Al A � B
�XIS'T1ic)G =MPE2viovx A126AJ =
B,jIc.D//V6J 'S59Z.p
AspHgLT e Gov , - 799(, 10
To,rAt_ ZAPEeV10dr = 13,588 J,F. 0.3) AC.
GP-AVe i_ A2Eq = % /ZS SF, 0,17 Ac.
F7"ertviovi AP- E4 = 1Z,381 S,F. = 0.2-8Ac, - 37.4-70
H taT OZICt G = (0.4-06 x!) 4- (o,ZIL3x O.S-o)+ (o.37gxO.ZO) = o.59
H t J T. Tc = / 8 7( l-1 - 0. s 9) z 7s'/Yi- = z 0 Ai
0, 53'/3
Htir Qzye = 0.S9X /.BZ X 0.76 = 0.8Z C.F.S.
141/7 Qioye = 0.S9 x 3•zS X O.70 = /•4/o e.FJ.
Tr— 14Mik, HIJ7 01e0yz = l•ZSX 0-59x lr,1SX 0.76 = 3,45
i
F P—OPOJ6t�" Z A PE P—V0 V-r Ata. eAJ =
Bv1LD/n/GS = 464-0 46
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T"oTA.L -!.miler-VIvOJ AP -EA
- 0/,14P
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(04,5%
f EP-viour AP -EA =
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35.5010
UM
STEWART&ALSSOCIATES PH. 482-9331RFAX 482-93gpLLINS, CO 80521
Consulting Engineers and Surveyors
By: P A 2. Date: i i r Client: G ic-s D o z l= Sheet No. 4 of
Project: L o T. SG ( Avo P4ar //F Lnrr 39 Rg-Q�.(^ir�, �At_K
Subject: S 7 n m 1>� A /A/ A r, 6 !. A L G O L .4 T io Al -f
$As iN A 4 t3
PE. VELOPei D C = 4• G4S X /) i- (0.3S5X O•Z0) = 0.7Z
Dew, T, c /. $7 (1. 1—0.7i=) Z7S/Z 7 ISMi.V.
DEV Qzy.e. = 0• 7Z x Z.IZx 0. 74 = b I (o c FI.
DEv.
Q,uy2 =
0. 77- X
3.7SX
0.76
= Z,OS
T Sn.v• Dev•
/.ZSX
0.7Zx
7.Zx
0,74 c ¢.97—c.FJ.
BAS/N 'B•,
AeEA= 14-Z50 Fr' 0.3Z7 /qc.i
HsT. rMPE2v100r a2EA 43Z tp ' C.010Ac. 3,l'�c
)'E2vlovs A 2EA = 6693 `' = D• IS¢Ac. _ ¢7. /°/a
GAAvEL_ Al e.4 = 7,1ZS�=0.l63Ac.=4-9.870
L = (0,031 x /) + (0.471 x 0•L) -F (0.49en 0.So) " 0. 37
Hisr. Tc = / 07 ( /-/ -0.3J 1715" s
ZS 7�Il:v
0, 37 l/3
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7c�= ZLA)'V' Mosr Qloo)K = /•Z$X 0.37 X 4-9.S XO.3Z,7 r 0.75 G.FJ
103 S. FORT
STEWART&406SOCIATES PH. 82-93311RFAX 482-9380LLINS, CO 80521
Consulting Engineers and Surveyors
By: P 4 ✓L Date: Client: C /t r a oe F Sheet No. T of 1D
PrOjeCt:/- OTt .S t, G+ ANA IDAPT knTS '1£ a 73 toe 1 /0 Cam,,4, PA6*fJF-i
Subject: ST02 M /Z A/.UA GI= G ALe- U/ Avia AJC
B /4 r / nl '.B" (c.o N r)
DEU, MAJP'CP-V10UJ AREA -7,;6B =o. 17(, A� = 53.87,
PEJBv,OvJ AP -EA
= G58Z `� " o. l 5-/A=.. - ¢6.Z%
G = (o.538x Ij I- (0.¢6.2.x 6-Z) = 0•L3
PGv. Tc, _ I. 87 0. 63) 175 �L
0•so ��3
Dev. zyp- = O• (.3 X 2,12. x 0. 3 Zi = 0.e-¢ G. F. J.
DEv• Q/0ye� 0.43 x 3.755 x p.3Z,7 = 0,77 c.Ff,
Tt- 10,%ty. Dav, QioOyR.= /.2Sx 0.63 x 7.fZ x 0,3z' 1 Ss c•::J.
DE7-EA17/0N �EQV/ecD = (7 4D Gv Pr.
i
17t;-rc—iv-rioA) F��0V/J>E0 = 1$3¢ Gv. F7.
ALLOWABLE Ou-r C.6T )C•QTd = 0. 9c�J• +�
D1SGHAP-6E PIPE YIZ/AJ6;
V = 0.6 frze)A e4-4-x 0.68 = 3r97
O.19c•Fs. Q 0.1.9 = 6• _ '� _ 3.i7 0,048 FTL 9 INL
Use 3" t?V,G. 10"e
3000
=CoO
0
STEWART&SSOCIATES
Consulting En3ineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
By: F—A4 Date: Client: Gic.sr>oec GA(e,gr E Sheet No. (o of /0
Project: / 0-r_c SF� L A1Jr> PAP—r l o>_s ? ¢ Ace _k / C'Ir?PAPA Nu
Subject: a A i A) � D ET6 A) Ti o A) M As r L /A G g 4,41
Tr n4 E C. r C 4
V 04-UMe- r7-3
/0
7•zo /,aSx0,(34 032,7
/. SG
// /
zo
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4.7,0
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!9 44
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3.s0
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so
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0.77
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o,Z7
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STEWART&ASSOCIATES
Consulting Engineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
By: R A l2. Date: � Client: G iLs D oe a 6A e A a 6 Sheet No. 2 of /n
Project: L o Ts J y /. A un PA r OF Lo rs 3 i4 ; Bcar-k l/ Ciro FAet i=E/GVT S
Subject:AFT GA/ -Tr O tiJ lPo,yo VAL b A6 CAcCu �A 7/a i 12C
DETE,VTION Poyl> VOLUmdME
EL65Vgi/oN
-DISC.HA PC,
P/ P
A,e EA Fr Z
O
9GD
+000
VOLUME F7
M
Z-0
++ Z8
s 0z. g
T OTA L l 8 3 4 FT'L
A� A,VN//VAS EQUA7-/6A)
3 K A x i�"'x 5
Q, I.44 x 0.044 0.047 y/3��L
0/7-0 77BS) (045
3" p,V'C. P+pE
/0
/z 4•Z x o, o;9 x 0•/s 7 x o.a/Z = 0.zv c,Fr. o /c
ALLowgBLE D/Jc-NAPG = 0./7c/7
SPILLkiAX D C-PTH
POND Wo�co F4� /N L9Miu
B J-OAD CXCS7E�D 6V6/,C.
Q= Cd x 7/3 x I Z 1 x B x H 7/L
/./¢=CO.SS)(0.67) (9. OL) (Z4) f/ 3 zZ
Hvv _ I'1a = 00/417/L H= D.Ofo
70 -,3
F2EE BOAPZD = O.11' 7 0.06' o k
{ - RAINFALL PERFORMANCE STANDARD EVALUATION
PROJECT: G�csDoP-F 6a¢A6s
COMPLETED
DEVELOPEDI
SUBBASIN
----------------
STANDARD FORM A
BY: 11A.2. DATE: kov. 24,1yqz
-----------------------------------------------------------
ERODIBILITY1 Asb I Lsb Ssb Lb I Sb PS
ZONE (ac) I (ft) I M (feet) I- (%)
- ( )
----------------------- I-----�i-----
-MoDECgrE 10.3Z74.1 /50' o.,$D%I /50 I D•SO% 17.4S/
---------------------------------------------------------------------
DI/SF-A:19B9 Cg
EFFECTIVENESS CALCULATIONS
-----------------
G------------ --- -----------------
PROJECT:
r sDozF GAZAra 6' STANDARD FORM B
COMPLETED BY: e q 4
DATE: Vev.3Q�/94�
Erosion Control
Method
----------------------
C-Factor
Value
P-Factor
Value
Continent
, L o/-------
aN L--------------------
0.01 /. D0
• EX/S7. 6RCVNDC(•�E_C 0.08 /•00
BA cc Snit /• 00 / Do
S TR/V d1 SALE B4R.2 fE.E �. �Q �• Q,F)Q
-g .
0. t
o 3
O.0�7 Ar.
Ex/1T.Nr C
•+
op it VEL r,/0 /.10 �. 11 A
Fc.vc r_ /• co �,vo
-----------------------------------
MAJOR PS. SUB AREA
BASIN (X) BASIN (Ac) CALCULATIONS
----- ------
----- ------------=-
BASiU/.�hT°
W7U• C-FAC.TpG C
�0.03yho.01)� (O.Oa7x0.o6q, (01146e
0.3Z7 O,3'tI
Cu I p p /tl r v n P _ 0. go
E FF
Ok 7s.v % /.45%
I----------------------------------=-----
------------------------------
Hn T /SF_R - 1 0Ro fis 1
11
CONSTRUCTION SEQUENCE
PROJECT:. rsAnar-g
STANDARD FORM C
SEQUENCE. FOR 19 —3 ONLY COMPLETED BY: A DATE:
Indicate by use of a bar line or symbols when erosion control measures will be installed.
Major modifications to an approved schedule may require submitting a new,schedule for
approval by the City Engineer.
YEAR
MONTH
----------------------------
OVERLOT GRADING
WIND EROSION CONTROL
Soil Roughing
Perimeter Barrier
Additional Barriers
Vegetative Methods
Soil Sealant
Other
RAINFALL EROSION CONTROL
STRUCTURAL:
Sediment Trap/Basin
Inlet Filters
Straw Barriers
Silt Fence Barriers
Sand Bags
Bare Soil Preparation
Contour Furrows
Terracing
Asphalt/Concrete Paving)
Other
VEGETATIVE: I
Permanent Seed Planting)
Mulching/Sealant
Temporary Seed Planting)
Sod Installation Ij
Nettings/Mats/Blankets
Other 1
LA Ain rcA P/hJG 1
--------------------------
STRUCTURES: INSTALLED BY
VEGETATION/MULCHING CONTRACTOR
DATE SUBMITTED
HDI/SF-C:1989
� I �
MAINTAINED BY
1-415101VID
---------------- ---
APPROVED BY CITY OF FORT COLLINS ON
N
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