HomeMy WebLinkAboutDrainage Reports - 09/16/1997r
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PROPMTT OF a !o
' FORT COLUNS UTUXr=,,
FINAL DRAINAGE REPORT
FOR
SAN CRISTO P.U.D., SECOND FILING
LOCATED IN THE CACHE LA POUDRE BASIN
1
1
' PREPARED FOR
' FORT COLLINS HOUSING AUTHORITY
AND
DAVERN INC.
' JULY 21,1997
1
PREPARED BY
' STEWART & ASSOCIATES, INC.
103 SOUTH MELDRUM STREET
' FORT COLLINS, COLORADO 80521
970/482-9331
1MI6 = 6 1991
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Table of Contents
1-2
Text
3
Vicinity Map
4
Poudre Basin Map
'
5-15
1988 San Cristo Drainage Report
16-18
Basin calculations
'
19
Concentration
Point quantities
'
20
Detention Pond Outlet Pipe Calculations
21
Backyard swale along east boundary and pond spillway
'
22
Allowable Street Flow -2 Year Storm
23
Allowable Street Flow - 100 Year Storm
'
24
Erosion Control Rainfall Performance Standard
25
Erosion Control Effectiveness Calculations
26
Erosion Control Construction Sequence
27
Erosion Control Collateral Required
Pocket
2 sheets
Grading Drainage and Erosion Control Plan
Drainage and Grading Design Plan
11
1
1
' July 21, 1997
1
Mr. Basil Hamdan
Stormwater Utility
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522
Dear Basil,
$TEWART&ASSOCIATE$
Consulting Engineers and Surveyors
The following is the final drainage report for San Cristo P.U.D., Second Filing which is
' located in the Northwest r/4 of Section 7, Township 7 North, Range 68 West of the 6th P.M., City
of Fort Collins, Colorado. The P.U.D. is a portion of Anderson Place which is being replatted.
San Cristo P.U.D., First Filing was platted in 1988 and has been partially developed. Houses have
been constructed on 13 lots in the First Filing.
' The Second Filing is bounded on the West by existing Tenth Street, on the North by the
Burlington Railroad, on the East by the future Lemay Avenue bypass and on the South by the
First Filing. The site is in the Dry Creek Drainage Basin. The site slopes from Northwest to
' Southeast at an approximate grade of 0.6%. The Second Filing contains 6.26 acres. The total
area of the combined First and Second Filings is 10.1 acres.
' . The detention pond was designed with the First Filing to provide detention for the entire
two Slings. The required detention was 52,154 cubic feet and the pond as designed has a volume
' of 67,861 cubic feet. A copy of the drainage report and calculations prepared February, 1988 for
the total San Cristo area is included in this report. This 1988 report calculated the offsite flows
from Anderson Place and also the 2 year and 100 year developed runoff at concentration points.
' Also the required detention, the allowable release rate, and the volume of the proposed detention
pond is calculated by this 1988 report. Only a part of the pond was constructed in 1988 to
accommodate the runoff from a portion of the First Filing. Since the outfall pipe and swale from
the pond had not been constructed, the amount of detention volume for the 13 lots was doubled
and the pond has functioned as a retention pond. The street and lot layout for the proposed
Second Filing has been revised from the original layout shown on the 1988 plan. A new overall
plan has been prepared which shows the proposed new lot layout and which shows the sub basins
per the new layout. New calculations are being provided for these revised sub basins and a copy
of the revised grading and drainage design plan is included in the pocket of this report.
' The remainder of the pond will be constructed with the Second Filing and the outfall pipe
' and swale will also be constructed. The allowable discharge from the pond is 2.02 cubic feet per
second from the First and Second Filings. This 2.02 cfs is the 2-year historic runoff from the
combined First and Second Filings. The runoff from the offsite area will be passed through the
pond and the total discharge will be 6.02 cubic feet per second. These release quantities were
calculated by the 1988 report.
' 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
Final Drainage Report
San Cristo P.U.D.
Second Filing
Page 2
The discharge will be through approximately 1400 feet of 30 inch storm drain pipe which
will be constructed from the detention pond outlet to the existing large swale which runs to the
east along the north side of East Lincoln Avenue. The Lincoln Avenue swale flows Easterly to
Dry Creek in the street right-of-way. An overflow box is planned at the outlet of the detention
pond. This box will let the allowable release rate of 6.02 cfs pass through the lower opening on
the box, and will allow the offshe flows from Anderson Place to enter the top of the box at the
high water line elevation. Calculations of this box and the flows are shown in the 1988 report.
All flows will be carried from the box in the proposed 30 inch pipe.
Erosion will be controlled with a sediment trap in the detention pond as soon as the outlet
structure is constructed. Straw bales will be used temporarily at the entrance to the pond before
the streets are paved. It is anticipated that it will take more than one year to construct the houses.
The lots will not be graded or disturbed until the house is under construction.
This report and the approved First Filing report were made in substantial compliance with
the City of Fort Collins Storm Drainage Design Criteria and Construction Standards.
The grading and drainage plans are included as a part of this report.
If you have any questions regarding this project, please call.
Sincerely,
Phillip I. Robinson, P.E. & L.S.
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EWART SOCIATE
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Consulting Engineers and Surveyors
STORM DRAINAGE REPORT
SAN CRISTO P.U.D.
' San Cristo P.U.D. is a ten acre site lying just east of Anderson Place,
and south of the Burlington Northern Railroad. The future Lemay Avenue
by—pass will lie along the easterly side of San Cristo P.U.D. Tenth
Street, which runs along the east side of Anderson Place, will be the
west street of the San Cristo P.U.D. Tenth street is presently paved
to ahalf width, and the pavement has a straight slope to the east.
' There are 'no .curbs in Anderson Place, .and, the east —west streets have
inverted crowns which drain to the east. It appears that most of the
Anderson Place development will drain to the east side of Tenth Street.
This water presently drains south along the east edge of the existing_
pavement, although the slope along this east edge is approximately 0.2
percent so the run—off is very slow and there are puddles. When the
' east half of Tenth Street is paved, and the east curb is constructed,
this off —site run—off from Anderson Place will drain through the proposed
' San Cristo P.U.D. into the new detention pond. The attached map shows
the proposed drainage patterns and flow quantities at critical locations.
There will be no off —site drainage from
the north because of the railroad
embankment.
We propose to provide detention for.the
San Cristo P.U.D. in the normal
manner of detaining the difference between
the 2 year historical run—
'
off and the 100 year developed volume, 'as
calculated on page 4. of this
report. Since the Anderson Place development is draining into the
'
detention pdnd, we plan to increase —the
out —flow quantity by the amount
of the 2 year flow from Anderson Place.
These calculations are shown
on page 5 of this report.
James H. Stewan
and Associates, Inc.
214 N. Howes Street
'
P.O. Box 429
Ft. Collins, CO 80522
3031482-9331
0
The 100 year flow from Anderson Place shall be routed through San Cristo
in the streets, and will enter the detention pond. These flow quantities
are shown on the map on sheet 11.
' The calculated composite C factor for this site is 0.5 as shown on sheet
3 of this report. The required detention quantity for the San Cristo
development is 52154 cubic feet as is calculated volume of the proposed
detention pond is 67861 cubic feet volume. There will be an outlet
structure to let the allowable outflow of 6.02 c.f.s. out from the bottom
' of the pond and to let the overflow through a grated opening when the
pond has been filled to a depth of 3.7 feet.
Sheet 6 is a mass diagram of the combined areas of San Cristo and Anderson
I Place, and it shows both the 10 year and 100 year volumes. From this
mass diagram, we see that the pond will hold the 10 year flow, and will
activate the overflow after 20 minutes of the 100 year storm. The pond
' will not overflow the 0.8 foot freeboard during the 100 year storm.
The 6.02 c.f.s. outflow and a maximum overflow volume of 15.8 c.f.s.,
' as calculated on sheet 7, will be carried under future Lemay Avenue in
a 24 inch R.C.P. After leaving the pipe, the 21.82 c.f.s. will be carried
in an open ditch to the drainage way along Lincoln Avenue. This ditch
will be temporary until such time the property it crosses is developed.
' There shall be a twenty foot wide easement provided for this ditch and
flow calculations are shown on sheet 11.
1 Phillip I. Robinson, P.E. & L.S.
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COLLINS, CO 80527
Consulting Engineers and Surveyors
By: P1rz Date: S Client: A%W101C Sheet No. of
' Project: Sot n Kr r t 4a (�. 1
Subject: Conc-e-4rat,4 on pO?'7-I
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STEWART&ALSSOCIATES
Consulting Engineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
By: P/R Dater Client: Fi- 6olliej (io✓ri^c Sheet No. ZO of
Project: San ��riS�O �w ri.
Subject: Deejo, Pot L O✓f-le> pipe CAll,- Plm Cavaai�v
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STEWARF&ASSOCIATES
Consulting Engineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
By: }' 1 R Date: ��_ Client:FI Co 11 i ns iig es r r Sheet No. Z 11 of
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' COMPUTATIONS _
Stewart & Associates, Inc. 103 S. MELDRUM st Ft. Collins, CO 80521 (303) 482-9331
Date Client Sheet No. 7_ of
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COMPUTATIONS
' Stewart & Associates, Inc.
By:Date Client:_
... 103 s. MELDnu sr Ft. Collins, C0 80521 (303)482-9331
No. 2 3 of
Chkd By: Date Project: - — - -
Subject ALLOVIa)FLE PLOW /N LOCAL S7FEETS - IOC) YR S70ZM
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IN
RAINFALL PERFORMANCE STANDARD EVALUATION
---------------------------------------------------------------------
PROJECT: ,S'AM Creilro P. U, D., Xeco.vo Fiii,v& STANDARD FORM A
COMPLETED BY: IZ .44 - -- - DATE:_ FEa.2od9�
DEVELOPED ERODIBILITY Asb Lsb Ssb Lb Sb PS
SUBBASIN ZONE ac) (ft)• (%) (feet) (%) 0 )
SE GOUD MCDEZATE L.ZIAc. /OZO 0.44 /0?0 O-¢D%
0
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EFFECTIVENESS CALCULATIONS
PROJECT: SAwCew'>o PV.D., f6 vivo, Fu./,1lc STANDARD FORM B
COMPLETED BYA, DATE: Fen 74/49i
Erosion Control C-Factor P-Factor
Method Value Value Comment
BARS Gew/v�> I,00 1,00 3.17AC.
x E,sT/N6 la.2Arr 0.07 1,00 3,12.Ac.
SeD/ME 'r 84r,,v h o o 6. so
SrZA ,v 13 A C ES /. Oro G, Q a
'SILT /ceuce! /r00 0.50
RG-SeEC
BASIN ($) BASIN (Ac) CALCULATIONS
FIL/qL WTo C = (/�o-vx 3•/7) t(b•0�x-3.1L�
6,z9
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FF =
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MARCH 1991 8.15 DESIGN CRITERIA
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CONSTRUCTION SEQUENCE
IOJECT: Sqh Cr-fs -o P.U. D. STANDARD FORM C
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UENCE FOR 19 ONLY COMPLETED BY: DATE: Aprd ITT7-
icate 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
1roval by the City Engineer.
YEAR 97
MONTH S f S l X� S 1.0 I I D l s F
OVERLOT GRADING -
UD EROSION CONTROL
Soil Roughening
Perimeter Barrier Sill• Fe.rr
' Additional Barriers
,
Vegetative Methods
Soil Sealant
' Other
' I
NFALL 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
Nettings/Mate/Blankets
' Other
ST`ICTURES: INSTALLED BY MAINTAINED BY
VF■■ TATION/MULCHING CONTRACTOR
DATE SUBMITTED
APPROVED BY CITY OF FORT COLLINS ON
1
MARCH 1991 9-16 DESIGN CRITERIA
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STEWART&ASSOCIATES
Consulting Engineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
By: ;DJ R Date: 8' � G Client: Pf Cofi nJ d ollsihc Sheet No. 2 7 of _
Project: -Sa r, Gris%u P - U . D.
Subject: C—rosi o n zfo n lro / �Ul�a eTa.
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