HomeMy WebLinkAboutDrainage Reports - 10/06/19961
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FINAL DRAINAGE REPORT
FOR
GREAT DANE MINOR SUBDIVISION
April 4, 1996
STEWART & ASSOCIATES
103 SOUTH MELDRUM STREET
FORT COLLINS, COLORADO 80521
970/482-9331
APR "8hjo
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' STEWARr& SSOCWES
April, 4, 1996 Consulting Engineers and Surveyors
Mr. Basil Hamdan
Stormwater Utility
City of Fort Collins
t P.O. Box 580
Fort Collins, CO 80522
' Dear Basil:
The following is the final drainage report for Great Dane Minor Subdivision, situate in the
' Northeast 1/4 of the Northwest 1/4 of Section 24, Township 7 North, Range 69 West of the 6th
P.M., Fort Collins, Colorado. The site is in the Spring Creek Drainage Basin.
The area ofthe site is 0.27 acres, and it is located at the South end ofMorningside Drive. The
site is bounded on the North by existing duplexes and the end of Morningside Drive, on the East and
' South by Spring Creek and the Spring Creek Trail and open space. A single family residence is on
the West of the site.
' The site slopes from Northwest to Southeast at an approximate slope of 6% to Spring Creek.
The existing ground cover is weeds and grasses.
' The owner is proposing to build a duplex on Lot 1 and a garage on Lot 2. The two lots will
have a common driveway and parking area at the South end of Morningside Drive. Sub -basin I is the
site and contains 0.27 acres. The historic site drains Southeasterly to an existing 8 inch diameter
' P.V.C. pipe under the concrete Spring Creek Trail and then to Spring Creek. The two year historic
runoff rate from the site is 0.12 cubic feet per second and the 100 year historic rate of runoff is 0.43
cubic feet per second.
The developed site will have a runoff coefficient of 0.54, which will develop a two year
' developed runoff rate of 0.39 cubic feet per second and a 100 year runoff rate of 1.31 cubic feet per
second. The developed site will continue to flow in the same pattern to the existing 8 inch P.V.C.
culvert under the trail, which will be replaced with a 12 inch diameter P.V.C. pipe.
' Olfsite Basin II contains 2.29 acres and is the area from the centerline of Morningside Drive
West to the middle of the lots facing Whedbee Street and from the site North to the South side of
Parker Street. There is an existing inlet at the Southwest corner of the Parker Street-Momingside
Drive intersection that picks up the Parker Street runoff The Mite Basin II runoff flows to the
West gutter of Momingside Drive and then South to Spring Creek. The 2 year historic and
developed rate of runoff is 1.96 cubic feet per second and the 100 year rate of runoff is 7.69 cubic
feet per second.
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
I
Great Dane Minor Subdivision
' Page 2
' Offsite Basin III contains 0.81 acres and is the area from the centerline of Morningside Drive
East to the middle ofthe houses on the East side ofthe street. The North -South boundaries of Basin
III is the South side of Parker Street and the North line of our site. Basin III flows to the East gutter
' of Morningside Drive and then South to Spring Creek. The two year and 100 year historic and
developed runoff rates are 1.39 cubic feet per second and 4.81 cubic feet per second respectively.
' The developed runoff from all these sub -basins will be carried in the proposed gutter of the
parking area and driveway on Lots 1 and 2 to the Southeast corner of the parking area. A proposed
' two foot wide concrete pan will then carry the runoff to a new 12 inch diameter P. V.C. pipe under
the trail.
' EROSION CONTROL REPORT: The site is in a moderate wind and rainfall erodibility zone.
A silt fence will be placed along the Southerly boundary of the site. A straw bale dike will be placed
at the Southeast comer of the proposed parking area as soon as it is graded. A straw bale dike will
' also be placed at the North side of the 8 inch P.V.C. culvert under the trail. When the parking area
is paved and if the duplex and garage are still under construction a gravel filter will be placed at the
outlet from the parking area. A minimum of 1,300 square feet of sod will be placed on disturbed
' areas.
The runoff calculations, the erosion control calculations and the erosion control cost estimate
' are enclosed as a part of this report. The Utility and Grading Plan is also.enclosed.
This drainage report and the design of the drainage system are in compliance with the City
' of Fort Collins Storm Drainage specifications and criteria. If you have questions regarding this
report, please call
' Sincerely,
Richard A. Rutherford, P.E. & L.S. TEq'bti ��
President %
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STEWART&kSSOCIATES
Consulting Engineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
By: R ko'. Date: Ju i- -VCIient: DA ,J E SH t .e K Sheet No. of_
Project: p- F--,aT T-)AVE MiAloe _TyaDtvt_r/,gAz
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STEWAU&O SSOCIATES
Consulting Engineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
By: R A.2.. Date: j LX q,,,? Client: D A AJF- .Ty iJp_A- Sheet No. -(,-of
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STEWART$,kSSOCIATES
Consulting Engineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
By: 2 A' 9- -Date:, ,, Ly /Z /,?.? Client: p A ,v F. ftd i e ,t Sheet No. —7— of
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RAINFALL
PERFORMANCE STANDARD EVALUATIOPI
------------- -----------------�---------------------------------
PROJECT: CO eEA,- DA M sV op- sos
DIvirro.1
STANDARD FORM A
Avg
COMPLETED
BY: P, 4W,
--------------------
DATE:
--
DEVELOPED
ERODIBILITY
Asb
Lsb
Ssb
Lb
Sb
PS
SUBBASIN
ZONE
(ft).
(feet)
(0)
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Jw 6-B.v�N
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IL�I�.: a.fuaE:
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-EFFECTIVENESS
----------
I PROJECT: G,eEgr Dgae �Vltvoa:
-CALCULATIONS
-----
i�uefl!✓�fio.✓
-------------
STANDARD FORM B
COMPLETED BY: k?Aje-...
DATE:
Erosion Control
C-Factor P-Factor
Method
Value
Value
Comment
------Soil--------------
S 0
/• 0 0
/. oa
44so �x e, IV Ac.
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VUNptrruP- r.D Gr- Co..—:
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PS
SUB
AREA
---------------------------------------
IASINI
(%)
BASIN
(Ac)
CALCULATIONS
0• L741
---------------------------------
�V 7D C = &,loX Loa) 4- (0w4•A 0101)+('o104xo.o��r�ooyx
o .?, 7
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I/SF-B:1989
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CONSTRUCTION SEQUENCE
IROJECT: raiLsA7 7)AIIB M:aoa. Jumn VISIOAj STANDARD FORM C
EQUENCE FOR 19 9G ONLY COMPLETED BY: P - A . Q • DATE: Avl. dr/s 9 t-
ndicate 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
Ipproval by the City Engineer.
1991, YEAR
MONTH I
7( F E M I A I A T A I S O I AJ I D
IIND EROSION CONTROL
Soil Roughening
'Perimeter Barrier
Additional Barriers
Vegetative Methods
Soil Sealant
Other
rINFALL 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:
Permanent Seed Planting
Mulching/Sealant
Temporary Seed Planting
Sod Installation
' Nettinge/Mate/Blankets
Other
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IWRUCTURES: INSTALLED BY MAINTAINED BY
�GETATION/MULCHING CONTRACTOR
DATE SUBMITTED APPROVED BY CITY OF FORT COLLINS ON
MARCH 1991 8-16 DESIGN CRITERIA
ciz)
STEWARF&ASSOC ATES
Consulting Engineers and Surveyors
EROSION CONTROL COST ESTIMATE
1. 235 L.F. Silt Fence @ $2.50/FT $588
2. Straw Bale Barrier 2 @ $75 $150
3. Rock Filter 1 @ $100 $100
4. 1300 S.F. of Sod @ $0.12/S.F. 56
$964
The collateral will be 150% x $838 = $1257
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
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