HomeMy WebLinkAboutDrainage Reports - 05/12/1996I
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1F ;Final A Report
FORT COS �'M safe
REVISED
DRAINAGE REPORT OF
LOT 169 BLOCK 49 EVERGREEN PARK
LOCATED IN THE DRY CREEK
DRAINAGE BASINS
PREPARED FOR
DAN VOGEL
AND DICK WARTENBE
April 29, 1996
PREPARED BY
STEWART & ASSOCIATES, INC.
103 SOUTH MELDRUM STREET
FORT COLLINS, COLORADO 80521
970/482-9331 -
STEWART&AISSOCIATES
Consulting Engineers and Surveyors
April 29, 1996
Mr. Basil Hamdan
Storm Water Utility
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522
Dear Basil,
re: Lot 16, Block 4, Evergreen Park
Mr. Vogel and Mr. Wartenbe have decided to pave the west part of their project, instead
of the originally proposed gravel surfacing.
The grades in the proposed paved area will remain the same, so the only revision to the
drainage calculations will be the quantity of runoff and the additional detention volume required.
I have recalculated the new composite runoff coefficient and the new detention volume
required. The pond high water elevation will raise 0.10 feet to provide the needed additional
volume. This will be accomplished by raising the pond overflow elevation through the driveway
from 70.00 to 70.10. The concrete floor of the building is already constructed at elevation 71.0
so there now will be 0.9 feet of freeboard between the 100 year high water line elevation and the
finish floor. A variance from the required 1.0 foot freeboard is hereby requested.
The maximum ponding depth on the asphalt parking area will be maintained at 1.50 feet at
the lowest point.
On March 27, 1996 I made a revision to the entrance driveway to allow room for a 4 foot
wide sidewalk for handicapped access. In order to provide this room, the south concrete wall of
the detention pond was moved 4 feet to the north. This lessened the provided detention volume
by about 120 cubic feet. I have taken this pond area revision into account in the revised
calculations included with this report.
This revised report includes the new calculations sheets and a copy of the revised overall
utility, grading, drainage and erosion control plan. The erosion control procedures are not
changed by this proposed revision.
This revised report is prepared in compliance with the City of Fort Collins Storm Drainage
Criteria.
Sincerely,
Phillip I. Robinson, P.E. & L.S.
�
President
James H. Stewart
rrc and Associates, Inc.
103 S. Meldrum Street
P.O. Box 429
Ft. Collins, CO 80522
970/482-9331
Fax 970/482-9382
� h
4502
SITE INFORMATION AND LOCATION
Lot 16 in Block 4 of Evergreen Park is a 39500 square foot lot which was platted in 1973. The lot
is located on the west side of Blue Spruce Drive about 700 feet north of Conifer Drive. All streets
and utilities in the area are existing. The lots to the south and west are developed and the lots to the
north are vacant.
EXISTING SITE CONDITIONS
Lot 16 drains from the west to Blue Spruce Drive on the east on a slope of about 1.0 percent. There
is no offsite drainage onto Lot 16. Lot 3, which is located directly west of Lot 16, has been graded
to drain back to the west. Lot 17 on the north and lot 15 on the south both drain east to Blue Spruce
Drive.
Lot 16 is presently covered with fairly heavy vegetation.
PROPOSED DEVELOPED DRAINAGE
Lot 16 will be graded to drain to a detention pond located along the east side of the lot. The
' pond will be adjacent to Blue Spruce Drive and the pond outflow will be released into the west gutter
of Blue Spruce Drive through a restricted orifice.
The detention volume requirement is the difference between the 2 year historic runoff and the
100 year developed runof, with the allowable release rate being the 2 year historic rate.
Calculations ofthe allowable release raterestricted orifice sizing, required detention volume
and volume of the proposed pond are shown on the included sheets.
EROSION CONTROL
Lot 16 is located in a moderate rainfall erodibility zone and in a moderate wind erodibility
zone. The east two thirds ofthe lot will be covered by the detention pond paved parking and drives
and by the building. The rear one third of the lot will be covered with a gravel storage area and by
two storage buildings. A silt fence will be installed along the west curb of Blue Spruce Drive during
overlot grading. A sediment trap will be placed over the detention pond outlet. Adequate wind
erosion will be provided by the construction of the building and by the rainfall erosion control
measures. All erosion control procedures shall comply with City of Fort collins Criteria.
-9 STATES
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RAINFALL
PERFORMANCE STANDARD EVALUATION
---------------------------------------------------------------------
PROJECT:
LoT /6 Bi-oc<
4-
r:VERGREEN RnRK
STANDARD'FORM A
COMPLETED
BY:
DATE: )�cI �s
-----------------------------------------------------------�i--f
DEVELOPED
ERODIBILITY
Asb
Lsb Ssb Lb
Sb PS
SUBBASIN
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(ac)
(ft) .
(�)
(feet)
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IIDI/SF-A:1989
EFFECTIVENESS CALCULATIONS
PROJECT: tor. /vl' 13[.00k
-------------------------------------
4- evFF6w5Ell Pf-lKK
STANDARD FORM B
COMPLETED BY: 77/g
DATE: Z q
Erosion Control
C-Factor
P-Factor
Method
Value
Value
Comment
3are Soil
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----------------------
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SUB AREA
BASIN (Ac) CALCULATIONS
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0,9►' 6000(lo S slq-6 0.1514c ---
5 ra ✓ e l O-C3 Ac
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DI/SF-B:1989
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CONSTRUCTION SEQUENCE
PROJECT: _1-01 16 3L.00K ¢ EVFR*9FEn) PARK STANDARD FORM C. �
SEQUENCE. FOR 19 95-94 ONLY COMPLETED BY: 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
MONTHD -�
A- �. S
OVERLOT GRADING------------------i----i----T----1----T----t----T----t-------i.
WIND EROSION CONTROL
Soil Roughing
Perimeter Barrier
Additional Barriers
Vegetative Methods
Soil Sealant
Other 131d5 slob
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 131dti Fdn
Gravel
VEGETATIVE:
Permanent Seed Planting
Mulching/Sealant
Temporary Seed Planting
Sod Installation
Netti ngs/Mats/Bl ankets
Other
STRUCTURES: INSTALLED BY ' MAINTAINED BY
VEGETATION/MULCHING CONTRACTOR
DATE SUBMITTED APPROVED BY CITY OF FORT COLLINS ON
' HDI/SF-C:1989
Fl
' JANtiARY 1991 8-20 DESIGN CRITERIA
1 STEWART&6SSOCIATES 103 S. 93 DRUM,1 FAX FORT gOLLINS, CO 80521
Consulting Engineers and Surveyors PH.
1 By: Pig Date: UI Client:Dan)Sheet No. _of
Project:- - LOL /G Black Fot,4
1 Subject: Eros ion (fo^l no if 11 ct1 er'G I
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EROSION CONTROL'
THE OWNER SHALL PLACE A SILT FENCE ALONG TNC OACH OF THE EARN ON BLUE SFRUCE.
CONTRACTOR SHAµ CLEAN OFF DAILY ALL SOLD AND DBMS TRACKED ONTO PAVEMENT.
VISTALL- PA SEDIMENT TRAP OVER TIT£ OE1lN➢ON POND Okn E IMMEOWTELV AFTER THE
OUTLET WONKS /S CO PLETCO
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