HomeMy WebLinkAboutDrainage Reports - 02/16/2001Final ovad Report
PROPERTy OF
FORT COLLiMS UTEUTM
FINAL DRAINAGE REPORT
FOR ! -
SUNOL ACRES NrnQ Il
FOX MEADOWS BASIN I /✓�� {\
PREPARED FOR
WARRAY OF FORT COLLINS LLC
OCTOBER 24, 2000
PREPARED BY
STEWART & ASSOCIATES
103 SOUTH MELDRUM STREET
P.O. BOX 429
FORT COLLINS, CO 80522
TEL. 970-482-9331
FAX. 970-482-9382
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Table of Contents
1-2
Text of Report
3
Vicinity Map
4-9
Runoff Calculations
10
Detention Pond Mass Diagram
11
Detention Pond Volume & Orifice Plate
12-15
Erosion Control Calculation
16
Spillway Design
17
Inlet Calculation
18
Rip -Rap Calculations
19
Variance Request
20-21
Offsite Drainage Easements
Pocket
Grading, Drainage and Erosion Control Plans
& Plat of Offsite Storm Drain Plan and Profile
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STMAU&kSSOCIATES
Consulting Engineers and Surveyors
'
October 24, 2000
'
Mr. Basil Hamdan
Storm Water Utility
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522
Dear Basil,
' The following is the Final Drainage Report for Sunol Acres which is situate in the Northwest
1/4 of Section 33, Township 7 North, Range 68 West of the Sixth P.M., City of Fort Collins, County
' of Larimer, State of Colorado.
The site contains 5.1616 acres and is a replat of Lot 1 Strobel M.R.D. The site will be divided
' into 4 large lots. It is zoned Urban Estate. Lot 1 has an existing residence and Lots 2 thru 4 will
have single family residences constructed.
' The site is bounded on the West by County Road 9, on the North by two metes and bounds
large lots that are not in the City of Fort Collins, on the East by Lot 2, Strobel M.R.D. which is also
not in the City and on the South by Charlie Lane which is annexed but has not been hard surfaced.
The Christ Fellowship Church Subdivision, that is being reviewed by the City of Fort Collins, is on
the South side of Charlie Lane.
' The site slopes from the Southwest corner to the Northeast corner at an approximate slope
of 0.8%. The ground cover of the site is alfalfa except for the yard and gravel driveways of Lot 1.
' The Lot 1 ground cover will not be disturbed. The ground cover on Lots 2 thru 4 will not be totally
disturbed in order to construct the residences due to the large area of the lots.
' The historic site has two sub -basins. H.B.-1 is the East half of County Road 9 which drains
into a small borrow ditch which flows North to West Horsetooth Road. H.B.-2 is the remainder of
the site. It sheet flows to the Northeast corner of the site and then on Northeasterly to the Fossil
' Creek Reservoir Inlet Ditch.
The developed site is also divided into two sub -basins. D.B.-1 is also the paved part of the
County Road 9 right-of-way which will drain North in the proposed curb and gutter to the existing
borrow ditch on the property lying North of Sunol Acres. There will be some widening of the
pavement to the East curb when it is constructed. The runoff continues to flow North to Horsetooth
' Road. D.B.-2 is the remainder of the site. The area of D.B.-1 is 0.27 acres and the area of D.B.-2
is 5.58 acres.
1
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
J
' It is planned to provide on site detention for D.B.-2 in the Northeast corner of Sunol Acres.
A drainage easement will be dedicated on Tracts "A' and "B" for the detention pond.
A drainage easement is being acquired from the owners of Lots 2 and 4, Strobel M.R.D. to
carry the storm water from the pond, East to the Fossil Creek Inlet Ditch at the historic rate of 1.23
' cubic feet per second. The 15 inch A.D.S., N-12 storm pipe is designed to carry the developed 100
year discharge rate of 8.54 c.f.s. if the outlet of the pond is plugged. The outlet structure from the
pond is an area inlet. The upstream side of the inlet has a restriction plate that meters the discharge
' into the area inlet. If the orifice is plugged, the pond will fill and the spillway is on the top of the area
inlet, allowing the discharge to flow into the inlet grate and flow out the 15 inch A.D.S. storm drain
' at the flow line of the inlet box. A copy of each easement is enclosed in this report. The detention
volume required is 15,804 cubic feet.
' EROSION CONTROL
The site is in the moderate rainfall erodibility zone and in the moderate wind erodibility zone.
' The site has a good ground cover of alfalfa that will not have over lot grading done on the entire site.
Charlie Lane is an existing gravel road that will have curb and gutter constructed and then be paved.
Straw bale dikes will be installed'in the existing.borrow ditches at the East end of Sunol Acres. A
' straw bale dike will also be placed at the outlet of the detention pond during construction of the pond.
The pond will be reseeded after the grading is completed for the pond. A silt fence will be
constructed along the North and East lines of the site.
1 The grading plan and the storm water runoff calculations and the erosion control calculations
are enclosed as a part of this report.
This drainage report and the design of the drainage stystem are in compliance with the City
of Fort Collins Storm Drainage specifications and criteria. If you have any questions regarding this
' report, please call.
Sincerely,
I li�'.ow� a• y�`�V�.��,G1STEhy�iQ�eQ
Richard A. Rutherford, FI.E. & L.S.
RAR/meh = 5028
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STEWART&SSOCIATES
Consulting Engineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
By: Date: &-n I-). tul Client: U-1,4 p- p— A X0 r F,. 60 Z-/- /,Uj Sheet No. 4- of
Project: So tin A r- e 6_= S
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Consulting Engineers and Surveyors
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PH. 482-9331 FAX 482-9382
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PH. 482-9331 FAX 482-9382
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PH. 482-9331 FAX 482-9382
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PH. 482-9331 FAX 482-9382
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9 COLLINS, CO 80521
Consulting Engineers and Surveyors
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SUNOL DETENTION POND HIGH WATER LINE
VOL. = 1/3 (AREA ABOVE) (DIFFERENCE IN COUNTOUR ELEV.)
2. FOR THE REMAIMDER OF THE VOLUMES BETWEEN CONTOURS (SECTION 9.2)
VOL. = DEPTH/3 (A +(AB) ^ .5 + B) FOR: Uniform Sides sec.(9.2)
3. HWL=(VOL.REQ.—VOL.LOW CUML)*3/(AREA LOW+AREA HIGH+(low area*high area) ^ .5)
' 22.E10' =HWL POND
ORIFICE SIZING
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ORIGINAL DESIGN DATA
1.23 = Allowable Des. Release Rate cfs NOTE: 1. VERT. PLATES WILL BE PLACED
20.50 = Flowline Orifice Elevation ft AT PIPE FLOWLINE
0.65 = Orifice Coefficient Cd
1.50 = Avaliable Driving Head ft
VERT. CIRCULAR PLATE
30 38 ' Outlet Area ruches
0 rCufar ratlius inches
Actijed tlraulic Drivin" Head fE'
VERT. SQUARE PLATE
30 OS Outlet Area inches
5 48 `Side for S O "ernn in. ches
'' 1 27 .= ActuaLH tlraulic Drivin" Head ff'
CONSTRUCTION SEQUENCE
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PROJECT: SVAiD/_ Ac.ieEs STANDARD FORM C
SEQUENCE. FOR 10 Zew ONLY COMPLETED BY: Q ,A, e. DATE: !i
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.
z000 YEAR I
MONTH M ,4 14 T T A S S O
---------------------- ------------------ ----- ---------- ----- ---- --------y----=----�
OVERLOT GRADING
� � I
WIND EROSION CONTROL `
Soil Roughing I I
Perimeter Barrier
Additional Barriers
Vegetative Methods I
Sail 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:
Permanent Seed Planting
Mulching/Sealant
Temporary Seed Planting
Sod Installation
Nettinos/Mats/Blankets
Other
STRUCTURES: INSTALLED BY
VEGETATION/MULCHING CONTRACTOR
DATE SUBMITTED
HDI/SF-C:1989
-----------------------------
MAINTAINED BY
APPROVED BY CITY OF FORT COLLINS ON
=ems
' JANU A 1 1991 8-20
DESIGN CRITERIA
RAINFALL PERFORMANCE STANDARD EVALUATION
---------------------------------------------------------------------
PROJECT: Su aoL- Areas STANDARD FORM A
COMPLETED BY: e.A.,e. DATE:
-------------------------------------------- - -----
DEVELOPEDIERODIBILITY1 Asb Lsb Ssb ( Lb I Sb I PS
SUBBASIN ZONE ( (ac) I
(ft) (ro) .(feet) (o) ()
D,.B•-/ [ MOb61,1,1 O-Z7Aej 39.SFj o.-71,%
p B. Z MUDERgTE �� S,sak. I! 7 Z 0 FTII / D
I I s Bsq� ! i 70S o,qS%, 78-o
------------------------------------------------------
DI/SF-A:1989
(/4)
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EFFECTIVENESS CALCULATIONS
PROJECT: J u Al o L, A c le es
COMPLETED BY: 2 . A • 2 .
STANDARD FORM B
DATE:
Erosion Control
C-Factor
P-Factor
Method
Value
Value Comment
13A26 SOIL
/'0
/.O
ESTABLUh'cD 6e,4S.
0.08
/10
AS pH.gCT ( Co vc.
0. 0/
/,OD
GCAvS-,L R04
O-o("
110
.DTI-Aw BAc.Es
S t L-r FE'NcE
/, 0
ae
/• 0
O•SO
($) 1BASINI (Ac) I CALCULATIONS
78.07o D•B-1 0,a?Ac. Atptialf -0•ll ,4c.
BAeelot,-
� - = 0•GO
D'-7 O.2�
F Q c- roR- = 0. 8 0
C/-�0• GO]X/Od = 5-Z•0%
76-0 AB-Z S-S8 AL GIE?Av�L 2oAD - 0•Z3 Ac.
ES7A BISHED C�,eii.iJ - 4.7
w D C=Ca•oalc o Z3) +-(1'0r, 6•`9-) 4- (o•ogx 4,71
0' b7o-7
s sg
?0 p = 0• go x 0. so - 0,4-0
E FF =�_ (o.lZ A 040
X /oo = y S. Z o /,
SSs4�. EFF
L"6r�=CSZ•Ox 0•17) 1/qs,Z X5.S$,
ok
75 0
MARCH 1991 8_15
DESIGN CRITERIA
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CIS)
STEWART&ASSOCIATES
Consulting Engineers and Surveyors
November 1, 1999
Mr. Basil Harridan
Storm Water Utility
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522
Dear Basil,
The following is the erosion control cost estimate for Sunol Acres.
1. 896 L.F. Silt Fence @$3.00/Ft. $ 2,688.00
2. 3 Straw Bale Dikes @$100/Ft. $ 300.00
3. Reseeding 0.80 Ac. @ $639/Ac. $ 511.00
The escrow will be 1.5 x $ 2,988 = $ 4,482.00
If you have any questions regarding this estimate, please call.
Sincerely,
Q
Richard A. Rutherford, P.E. & L.S.
RAR/meh
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
Cis)
EMERGENCY SPILLWAY DESIGN
Weir Equation Q = C L (H) ^ 3/2
Q (cfs), C (weir coefficient), L (crest length, feet), H (energy head, feet)
10 = Weir Length L in feet
3.1 = Weir Coefficient
Weir Shape Broadcrested
Design Flow 8.54 (cfs)
Depth of
flow (ft)
Flow Over Weir
cfs
0.10
0.98
0.20
2.77
0.30
5.09
0.40
7.84
0.41
8.14
0.42
8.44
0.43
8.74
0.45
9.36
0.50
10.96
1.00
31.00
to'
23•D
• 4
t
-------------7----------------------------------------------
UDINLET: INLET HYDARULICS AND SIZING
' DEVELOPED BY
DR. JAMES GUO, CIVIL ENG DEPT. U OF COLORADO AT DENVER
SUPPORTED BY METRO DENVER CITIES/COUNTIES AND UD&FCD
---------------------------------------------------------------------
SER:Alex Stewart.......
N DATE 06-02-2000 AT TIME•13:59:56 _
** PROJECT TITLE: SUNOL ACRES
*** CURB OPENING INLET HYDRAULICS AND SIZING:
' INLET ID NUMBER: 10
'
INLET HYDRAULICS: IN A SUMP.
GIVEN INLET DESIGN INFORMATION:
GIVEN CURB OPENING LENGTH (ft)=
2.00
HEIGHT OF CURB OPENING (in)=
6.00
INCLINED THROAT ANGLE (degree)=
0.00
'
LATERAL WIDTH OF DEPRESSION (ft)=
2.00
SUMP DEPTH (ft)=
0.20
Note: The sump depth is additional depth to flow
depth.
INLET INTERCEPTION CAPACITY:
IDEAL INTERCEPTION CAPACITY (cfs)=
5.54
BY FAA HEC-12 METHOD: DESIGN FLOW
FLOW INTERCEPTED
(cfs)=
2.70
CARRY-OVER FLOW
(cfs)=
0.00
BY DENVER UDFCD METHOD: DESIGN FLOW
(cfs)=
2.70
'
FLOW INTERCEPTED
(cfs)=
2.70
CARRY-OVER FLOW
(cfs)=
0.00
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STEWART&kSSOCIATES
Consulting Engineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
By: P Dater AT ZooClient: IA)AiegAy 1r-r-r6oL.41,,u I -Lc- Sheet No. of
Project:
:' A P
Subject: El I P (— A LC- U I-
1'p )C- A -r Easf AND
04&
4- -
P A w
_47
!EM P 0 F_ A)ey.
A A1_oe_r'14;_
0 1.4 to
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fre m p-e;i P_'J"e
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STEWART&ASSOCIATES
' Consulting Engineers and Surveyors
Mr. Basil Harridan
' Stormwater Utilities
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522-0580
Dear Basil,
' This is to request a variance from the extended detention requirements for water quality
for Sunol Acres situate in the Northwest 1/4 of Section 33, Township 7 North, Range 68 West of
' the 6th P.M., Fort Collins, Colorado. The subdivision is four large lots on Charlie Lane at County
Road 9. The lots average 1.25 acres. The lots have large disconnected impervious areas and long
distance sheet flow patterns of about 300 feet to the stormwater detention pond. The lots have
' good existing ground cover which will not all be disturbed during construction. The length of the
outfall grass swale is about 800 feet. Most of the drainage areas will have higher grass rather than
mowed bluegrass. For the above reasons we feel the water quality from this site will be good.
' If you have any questions regarding this matter, please call.
' Sincerely,
.`-`N�. ! GISTc
u- C� ? �<
Richard A. Rutherford, P.E. & L.S.*' 5028
RAR/bac �,; . .•.... ��
1
James H. Stewart
t and Associates, Inc.
103 S. Meldrum Street
P.O. Box 429
Ft. Collins, CO 80522
970/482-9331
Fax 970/482-9382
(?-0
DEED OF DEDICATION FOR EASEMENT
(Off -Site Drainage Easement)
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KNOW ALL MEN BY THESE PRESENTS: That the undersigned David J. Robertson, being the owner of certain
real property in Latimer County, Colorado legally described as Lot 2, Strobel M.R.D., #5-60-87, County of Latimer, State of
Colorado (the "Robertson Property"), in consideration of Ten Dollars ($10.00) in hand paid, the receipt of which is hereby
acknowledged, and other good and valuable consideration, does hereby dedicate, transfer and convey to the City of Fort Collins,
Colorado, a Municipal Corporation, a permanent drainage easement (including the swale as depicted on the Grading, Drainage &
Erosion Control Plan for Sunol Acres as approved by the City of Fort Collins) on a portion of the Robertson Property, which
portion is more particularly described as follows:
The North 10.00 feet of Lot 2, Strobel M.R.D., #5-60-87, County of Larimer, State of Colorado (the "Easement").
It is understood by the undersigned that, by acceptance of this dedication, the City of Fort Collins is not accepting the
duty of maintenance of the Easement.
Witness our hands and seals this _ day of January, 2000.
GRANTOR:
David J. Robertson
STATE OF COLORADO )
) ss.
COUNTY OF LARIMER )
The foregoing instrument was acknowledged before me this _ day of January, 2000, by David J. Robertson.
Witness my hand and official seal.
My commission expires:
Notary Public
TERMS CONSENTED TO:
The undersigned GMAC MORTGAGE CORPORATION, a Pennsylvania corporation, in its capacity as assignee -
lender under that certain Real Estate of Deed of Trust recorded in the Larimer County records on October I, 1993, at Reception
#93072023, consents to this Deed of Dedication for Easement:
GMAC MORTGAGE CORPORATION, a
Pennsylvania corporation
By:
Its
STATE OF )
)ss.
COUNTY OF )
The foregoing instrument was acknowledged before me this _ day of 2000, by
as on behalf of GMAC MORTGAGE CORPORATION, a Pennsylvania
corporation.
Witness my hand and official seal.
My Commission expi
y' Accepted by the City of Fort Collins on the
Notary Public
day of January, 2000.
CITY OF FORT COLLINS
ATTORNEY'S CERTIFICATION
City Clerk
1 hereby certify that the foregoing Deed of Dedication has been duly executed as required pursuant to §2.2.3(C)(3)(a)
through (e) inclusive of the Land Use Code of the City of Fort Collins, and that all persons signing this Deed of Dedication on
behalf of a corporation or other entity are duly authorized signatories under the laws of the State of Colorado. This Certification
is based upon an examination of the records of the Clerk and Recorder of Larimer County, Colorado, as of the 25th day of
January, 2000, and other information discovered by me through reasonable inquiry and is limited as authorized by
§2.2.3(C)(3)(1) of the Land Use Code.
ALLEN, VAHRENWALD & JOHNSON. LLC
M
Russell B. Sanford, No. 17499
125 South Howes Street, Suite 1100
P. O. Box 608
Fort Collins, CO 80522-0608
(970)482-5058
\sys\MSW\Real Eslale\RBS\Warren-Ray\Easement-Robertson.doc
DEED OF DEDICATION FOR EASEMENT
' (Off -Site Drainage Easement)
KNOW ALL MEN BY THESE PRESENTS: That the undersigned Judy Christensen a/k/a Judith R. Christensen,
' being the owner of certain real property in Larimer County, Colorado legally described as Lot 4, Strobel M.R.D., #S-60-87,
County of Larimer, State of Colorado (the "Christensen Property"), in consideration of Ten Dollars (S 10.00) in hand paid, the
receipt of which is hereby acknowledged, and other good and valuable consideration, does hereby dedicate, transfer and convey
to the City of Fort Collins, Colorado, a Municipal Corporation, a permanent drainage easement (including the Swale as depicted
' on the Grading, Drainage & Erosion Control Plan for Sunol Acres as approved by the City of Fort Collins) on a portion of the
Christensen Property, which portion is more particularly described as follows:
The North 10.00 feet of Lot 4, Strobel M.R.D., #S-60-87, County of Larimer, State of Colorado (the "Easement").
' It is understood by the undersigned that, by acceptance of this dedication, the City of Fort Collins is not accepting the
duty of maintenance of the Easement.
' Witness our hands and seals this _ day of January, 2000.
GRANTOR:'
' Judy Christensen.a/k/a Judith R. Christensen
' STATE OF COLORADO )
) ss.
COUNTY OF LARIMER )
The foregoing instrument was acknowledged before me this _ day of January, 2000, by Judy Christensen aWa Judith
R. Christensen.
Witness my hand and official seal.
' My commission expires:
Notary Public
TERMS CONSENTED TO:
The undersigned COUNTRYWIDE HOME LOANS, INC., ATIMA, in its capacity as assignee lender under that
certain Real Estate Deed of Trust recorded in the Larimer County records on March I, 1999, at Reception #99017395, consents
to this Deed of Dedication for Easement:
COUNTRYWIDE HOME LOANS, INC.,
ATIMA
By:
STATE OF
)ss.
COUNTY OF
The foregoing instrument was acknowledged before me this _ day of 2000, by
as , on behalf of COUNTRYWIDE HOME LOANS, INC., ATIMA.
Witness my hand and official seal.
My Commission expires:
1
-, Accepted by the City of Fort Collins on the
Notary Public
day of January, 2000.
CITY OF FORT COLLINS
By:
City Clerk
ATTORNEY'S CERTIFICATION
I hereby certify that the foregoing Deed of Dedication has been duly executed as required pursuant to §2.2.3(C)(3)(a)
through (e) inclusive of the Land Use Code of the City of Fort Collins, and that all persons signing this Deed of Dedication on
behalf of a corporation or other entity are duly authorized signatories under the laws of the State of Colorado. This Certification
is based upon an examination of the records of the Clerk and Recorder of Larimer County, Colorado, as of the 25th day of
January, 2000, and other information discovered by me through reasonable inquiry and is limited as authorized by
§2.2.3(C)(3)(f) of the Land Use Code.
ALLEN, VAHRENWALD & JOHNSON, LLC
By:
Russell B. Sanford, No. 17499
125 South Howes Street, Suite 1 100
P. O. Box 608
Fort Collins, CO 80522-0608
(970)482-5058
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