HomeMy WebLinkAboutDrainage Reports - 04/02/1999 (2)Final Moved
PROPERTY OF
FORT CODUNS tyrnJWMDRAINAGE REPORT
FOR
LOT 15, PROSPECT INDUSTRIAL
POUDRE RIVER BASIN
PREPARED FOR
DOHN CONSTRUCTION, INC.
MARCH 15,1999
PREPARED BY
STEWART & ASSOCIATES
103 SOUTH MELDRUM STREET
FORT COLLINS, CO 80521
TEL. 970-482-9331
FAX. 970-482-9382
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' Table of Contents
'
1-2
Text of Report
'
3
Vicinity Map
4-11
Storm Water Runoff Calculations
12
Midpoint Drive Drainage Capacity
13-16
Erosion Control Calculations
'
Pocket
Utility and Grading &
Drainage and Erosion Control Plan
t
Plat of Off -site Areas Draining to
Midpoint Drive
Hiisioric Drainage Basin Plat
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$TmART$ ssoCIATE$
Consulting Engineers and Surveyors
March 15, 1999
Mr. Basil Hamdan
Storm Water Utility
City of Fort Collins
' P.O. Box 580
Fort Collins, CO 80522-0580
Dear Basil,
The following is the Final Drainage Report for Lot 15, Prospect Industrial Park, City of Fort Collins,
County of Larimer, State of Colorado. The site is in the Poudre River Basin and contains 1.3724 acres.
The existing site slopes from Northwest to Southeast at an approximate slope of 0.7%. The site has a very
good ground cover of grass and weeds. The historical runoff sheet flows off the property to the South.
The historical drainage plan is included in the pocket of this report.
It is proposed to divide Lot 15 into two new lots which each will have an office/warehouse building.
The site will be phased with Lot 15-A being Phase I and Lot 15-B being Phase H.
The site is in the Poudre River Basin and is within approximately 1100 feet of the Cache La Poudre
River. Due to this close proximity to the River, it is proposed to not have storm water detention on site.
The runoff from the basin enters the outfall system to the River at the existing inlets at the comer of
Midpoint Drive and Sharp Point Drive. The Westerly inlet is only 450 feet Southeasterly of the Southwest
comer of Lot 15. The two inlets drain in a 24 inch R.C.P. to an existing gravel pit which drains into the
Cache La Poudre River. The OFF SITE AREAS DRAINAGE PLAN is included in the pocket of this
report.
The stormwater will be carried in the on -site curb and gutter to the oil and sand 'interceptor from which
it will discharge into the Northeasterly gutter of Midpoint Drive. The Phase I Building is Developed Basin-
1 and the developed runoff rates for it are Qn,, = 2.47 c.£s. and Q00 = 8.57 c.f s. The second phase is
Developed Basin-2 and the developed runoff rates for it are Q,,,, = 0.41 c.f s. and Q100 n= 1.15 c.f s.
There is not any appreciable stormwater runoff entering this site from off site. Lots 10 & 11 which are
adjacent to the rear of Lot 15, drain Southeast onto Lots 13 & 14. Lot 16 has not been developed at this
time and some of its historic runoff will sheet flow onto D.B.-1 and D.B.-2. The grading on both basins
will accommodate the off -site flow through each basin to Midpoint Drive. The offshe flow onto D.B.-1
is Q100 = 0.37 c.f s. and onto D.B.-2 is Q1. = 0.57 c.f s.
There was some concern at the conceptual review meeting regarding the capacity of Midpoint Drive
to carry the stormwater runoff that discharges into it. The flow in the Midpoint Drive South and
Southwesterly gutter from Timberline Road to the North lime of Prospect Industrial Park is diverted to the
East in a pan across Midpoint Drive and then to an existing pond in the Prospect East Industrial Park. The
North and Northeast gutter of Midpoint Drive flows into the Specht Point Road, Prospect Parkway and
the above described pan. There is a high point in Midpoint Drive 110 feet South of the pan at the North
James H. Stewart
and Associates, Inc.
103 S. Meldrum Street
P.O. Box 429
Ft. Collins, CO 80522
970/482-9331
Fax 970/482-9382
lime of Prospect Industrial Park. The pan crosses at the Southeast comer of the existing Larimer County
Jail property. Therefore, 1200 feet of Midpoint Drive is carrying runoff from the high point to the
Northwesterly comer of Lot 15. Three of the lots that have been developed have onsite detention. Five
lots that have been developed do not have detention and eight lots have not been built on. The resultant
runoff coefficient for the 14.3 acres is 0.35 Since Lot 15 is at the low end of the basin and near the
discharge to the Cache la Poudre River we are not providing on site storm water detention. The rate of
runoff at the Northwesterly corner of Lot 15 is Qrn = 6.5 c.£s. and Q100yr = 24.1 c.f.s. The capacity of the
street cross section is 68.45 c.£s. at 6 inches over crown, which is allowable in the 100 year storm. The
total capacity of the two gutters is 10.8 c.£s. which is allowable in the two year storm. The offsite area
drainage plan is included in the pocket..
EROSION CONTROL:
The site is located in a moderate wind erodibility zone and in a high rainfall erodibility zone.
A silt fence will be required around the perimeter of the site prior to beginning any overlot grading.
' Immediately after grading, the concrete building foundation will be installed and gravel road base shall be
placed in the driveways and parking areas. This road base shall be thick enough to handle construction
' traffic without failure. Straw bales will be installed after the site is graded and before the curb and gutter
and asphalt is installed at the points where the runoff discharges into Midpoint Drive.
This is a fairly small site and it will be very busy during building construction so vegetative plantings
will not be done until the building and paving procedures are nearing completion.
Wind erosion control on the site will be provided by the silt fence, building foundation and gravel road
base.
tAll erosion control procedures shall comply with the City of Fort Collins Criteria.
The stormwater runoff calculations, the Grading, Drainage and Erosion Control Plan and the overall
Utility Plan of Prospect Industrial Park showing the stormwater flows in Midpoint Drive are enclosed as
part of this report.
This drainage report and the design of the drainage system for Lot 15 are in compliance with the City
of Fort Collins Storm Drainage Specifications and Criteria. Ifyou have any questions regarding this report,
please call
Sincerely,
a. .
Richard A Rutherford, P.E. & L. S. it 5028
RAR/meh _
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RAINFALLPERFORMANCESTANDARD EVALUATION
------------- -----------------------------------------------I
PROJECT: L oT !S, Fi-ospcc7 -T, -ovsnemt- I'ARK STANDARD FORM A
{COMPLETED BY: %2-
--ATE 7 Z
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{DEVELOPEDIERODIBILITY 1
SUBBASIN I ZONE
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DI/SF-A:2989
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EFFECTIVENESS CALCULATIONS
PROJECT: LO r /S, 20SPEGT = vD(JrT e�AL t�4z E STANDARD FORM B
COMPLETED BY: -A•. DATE: 7 2 76
Erosion Control C-Factor P-Factor
Method Value Value Comment
Bare Soil /.00 1_00
Buildin FoV� Wro� a Od
A•G 4-d curtc pvm-k v.01 1.00
Gravel road b'G7e O. O!o l•00
MAJOR
PS
SUB
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BASIN
($)
BASIN
(Ac)
CALCULATIONS
23-1
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Gr,w el road.base O. Z0 AC -
AG er conc Pvn . 0.0 P Ae-
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P = o.So = s�1�- -1•e�ce
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CONSTRUCTION SEQUENCE
IOJECT: _LOT /�. P20SF1=G7- rAv L)ST-,e/,44 /qeA;: STANDARD FORM C
SEQUENCE FOR 19 ONLY COMPLETED BY: 1e.A 02. DATE: Oue-y Z,/L3
Licate by use of a bar line or symbols when erosion control measures will be installed.
Sajor modifications to an approved schedule may require submitting a new schedule for
1roval by the City Engineer.
119, YEAR
MONTH I -t- I C I JA I A I J.
GRADING
�D EROSION CONTROL
Soil Roughening
Perimeter Barrier
Vdditional Barriers
egetative Methods
Soil Sealant
'Other—GKAVBL$.AS6
AINFALL 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 — Fo&1,vz>Ario v
IVEGETATIVE:
Permanent Seed Planting
Mulching/Sealant
'Temporary Seed Planting
Sod Installation
Nettinge/Mate/Blankets
' Other
FTURES: INSTALLED BY MAINTAINED BY
ZETATION/MULCHING CONTRACTOR
SUBMITTED APPROVED BY CITY OF FORT COLLINS ON
MARCH 1991 B-16 DESIGN CRITERIA
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PH. 482-FAX 482-9382
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Project:
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