HomeMy WebLinkAboutDrainage Reports - 12/13/1999Fend roved Report
Otto =TY of Date 129
FORT COLLINS
FINAL DRAINAGE REPORT
' FOR
RIVERSIDE CENTRE
' SPR
ING CREEK DRAINAGE BASIN
1
PREPARED FOR
DONALD L. SKAGGS
' MARCH 30,1999
' STEWART & ASSOCIATES, INC.
103 S. MELDRUM
FORT COLLINS, CO 80521
TEL. 970-482-9331
' FAX 976-482-9382
TABLE OF CONTENTS
1-2
Text
3
Vicinity Map
4-9
Runoff Calculations
10-12
Mass Diagram & Pond Rating
Curve, & Orifice Calculation
13
Emergency Spillway Design
14-18
Erosion Control Calculations
19
Variance Request
20
Off -site Drainage Easement
Pocket
Grading, Drainage, &
Erosion Control Plan
STEWART&k� SOCIATES
' Consulting Engineers and Surveyors
March 30, 1999
' Mr..Basil Harridan
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 Riverside Centre which is a proposed office/warehouse
' development in Section 18, Township 7 North, Range 68 West of the 6th P.M., City of Fort Collins, County
of Larimer, State of Colorado. The site contains a net area of 2.8057 acres and a gross area of 3.5840 acres
to the centerline of Riverside Avenue. The site is in the Spring Creek Major Drainage Basin. The site is
' zoned I - Industrial.
The site is bounded on the North by the Union Pacific Railroad, on the East by an industrial building
' which contains Intermountain Color, on the South by Riverside Avenue and on the West by an industrial
building.
' The site slopes from Southwest to Northeast at an approximate slope of 1.25%. The site has a good
ground cover of grass and weeds.
' It is proposed to construct three buildings in four phases on the site. Building "B" will be built in Phase
I and H. Building "A will be Phase III and Building "C" will be Phase IV.
On site storm water detention will be provided The difference between the two year historic runoff rate
' and the 100 year developed runoff rate will be detained. The rational method was used to calculate the
runoff from the site. The mass diagram was used to determine the detention volume. The required detention -
volume is 23,952 cubic feet. The detention pond will be graded with Phase I. -A variance is being requested
' to the requirement that the detention pond depth shall not be greater than 1 foot, in a parking area. A small
area at the Northeast corner of the site where the concrete pan discharges out of the parking area into the
grass part of the pond has a depth of 15 inches. The detention pond will discharge 0.93 cubic feet per
' second at the Northeast comer of the site and the offsite area Northwest of the site will discharge 10.97
c.fs. which will flow Southeasterly in an existing borrow ditch to an existing 27 inch diameter iron pipe
under the Union Pacific Railroad The runoff will continue to flow through the 27 inch culvert at the historic
' rate and then Southeasterly in the existing Union Pacific Railroad borrow ditch until the borrow ditch fades
out. A drainage easement for a swale adjacent to the Railroad right-of-way on Lot 5 and on Lot 4, Uplands
Prospect Business Park P.U.D. has been acquired. The swale will continue to carry the runoff Southeasterly
' to the City of Fort Collins regional channel that is located between Lots 3 and 4 of Upland's Prospect
Business Park P.U.D.
' Sheet 5 of 6 delineates a swale plan and profile that will carry the runoff to the 27 inch pipe under the
Railroad and in the Railroad borrow ditch and in the Uplands swale to the City's regional channel.
I
The historic site was divided into two sub -basins. Historic Sub -Basin 1 is the entire site except for the
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
1 Northerly half of Riverside Avenue which is Historic Sub -basin 2. Developed Sub -Basin 2 is also the
Northerly half of Riverside Avenue and has the same runoff rates as Flistoric Sub -Basin 2. Developed
Sub -Basin 1 is all of the site except Riverside Avenue. The two year historic runoff rate for Sub -Basin 1
1 is 0.93 c.f.s. and the 100 year developed runoff rate for Sub -Basin 1 is 20.6 c.f.s.
All of the existing lots on the Northeasterly side of Riverside Avenue that are Northwest of this site
1 drain from Riverside Avenue (the front of the lot) to the rear of the lot. The runoff flows Southeasterly in
the Union Pacific right-of-way. Several of the lots have on site detention ponds. Therefore there are not
any offsite flows that enter this site. This site does not block any offsite flows.
1 EROSION CONTROL:
' The site is in the moderate wind erodibility zone and in the high rainfall erodibility zone.
The site will be built in four phases. Phase I construction will include the west 1/2 of Building B, the
1 paved driveway west of Building B, the paved driveways and parking at the front and back of the west 1/2
of Building B, a graveled secondary access driveway around the easterly end of Building B, and all grading
necessary to construct the entire detention pond area to the grades shown on the grading, drainage and
1 erosion control plan.
During Phase I construction, the Building A area will be left undisturbed and the pads for the east 1/2
1 of Building B and for Building C will be graded to subgrade.
Prior to beginning any grading on the site, a silt fence shall be installed along the northerly and easterly
(downstream) sides.
1 A gravel sediment trap shall be installed over the detention and outlet immediately after its
P Y
construction. The detention pond area which is not future pavement will be seeded and mulched after
1 grading is complete& Areas which are disturbed by grading but which are to be paved or which will have
a building in the future, are to have "Earthbound" soil stabilizer applied.
1 The runoff calculations, the erosion calculations and the Grading, Drainage and Erosion Control Plan
are enclosed as a part of this report.
1 This drainage report and the design of the drainage system are in compliance with the City of Fort
Collins Storm Drainage specifications and criteria.
1 If you have any questions regarding this report, please call.
Sincerely,
•��rs
1 r�
' Richard A. Rutherford, P.E. & L.S. * 5028
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Consulting Engineers and Surveyors
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PH. 481 Consulting Engineers and Surveyors
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EMERGENCY SPILLWAY DESIGN
Weir Equation Q = C L (H) ^ 3/2
Q (cfs), C (weir coefficient), L (crest length, feet), H (energy head, feet)
RIVERSIDE CENTER
' 20 = Weir Length L in feet
3.1 ='Weir Coefficient
Weir Shape Broadcrested
Design Flow 20.59 (cfs)
Depth of
flow (ft)
Flow Over Weir
(cfs
0.10
1.96
0.20
5.55
0.30
10.19
0.40
15.68
0.45
18.72
0.46
19.34
0.47
19.98
0.48
20.62
0.49
21.27
0.501
21.92 _
zo'
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' CONSTRUCTION SEQUENCE Q CE
�JECT : F I V E 9,51 D E C FN T 2— STANDARD FORM C
;EQUENCE FOR 19 ONLY COMPLETED BY: DATE:
ticate by use of a bar line or symbols when erosion control measures will be installed.
tajor modifications to an approved schedule may require submitting a new schedule for
�roval by the City Engineer.
1 �qy YEAR
MONTH AA I I I I
A
`'�
IWM LUT GKAUINQ—
i i
D EROSION CONTROL
Soil Roughening
I �
Perimeter Barrier
Additional Barriers I
i
'Vegetative Methods
I
Soil Sealant "Ear}% %opnJ-' i '
Other Did, 4- 9ra✓al drivef L ! r
I
IINFALL EROSION CONTROL
'STRUCTURAL:
Sediment Trap/Basin
I i ,
Inlet Filters
'Straw Barriers
Silt Fence Barriers
Sand Bags
'Bare Soil Preparation
Contour Furrows
Terracing
Asphalt/Concrete Paving
' Other gk1 4.5raveldriver.:
JGETATIVE:
Permanent Seed Planting
Mulching/Sealant EarR, Ov4,,
Temporary Seed Planting
Sod Installation
Nettinge/Mate/Blankets
' Other Pond arut seed. 44,m,4c-i
�CTURES: INSTALLED BY MAINTAINED BY
3ETATION/MULCHING CONTRACTOR
SUBMITTED APPROVED BY CITY OF FORT COLLINS ON
' MARCH 1991 8-16 DESIGN CRITERIA
RAINFALL PERFORMANCE STANDARD EVALUATION
(PROJECT: RIVER51DF CENT'R4
STANDARD FORM A
COMPLETED BY:
DATE: S 1198
I------- --------------------------------------------------------------
IDEVELOPEDIERODIBILITYI
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I SUBBASIN-I---ZONE
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EFFECTIVENESS CALCULATIONS
PROJECT: F j V E RS 1 D,ff C E N T R C- STANDARD FORM B
COMPLETED BY: DATE: t 9'8
Erosion Control C-Factor P-Factor
Method Value Value Comment
6-3 re .501) /. 00 /, 00
l
s;1r Few ce /- UU 0 5 0 I
UnClS�U��e� Bld�c i�
F_STas �IJiec! ve{Nra%ic�ort
l 0.05 1. 00
�arth�oUnd >`o;) s}a.b;)izer 0.3 1.00 Gh his^.r�eZ vr7,764 Ee arecs
gavel d rNe"T o.OG 1.00
6v�ldi �s F�v^�q!' °I� 0. 01 1.00
Sew , MV�Gh o.GG I•oU in Pd crrea
MAJOR
PS
SUB
AREA
BASIN
BASIN
(Ac)
CALCULATIONS
lo;rpL-
%%
aUi1dr�5 aroma A = 0,54Ac- c = 0.05
s)7F_
%``
vdes� bJd5 3 Pad : d.2G Ac. G - 0.O Of
Z . 80/It
✓�) % 0s0 on dt-tl/CS - o , 60.4c, G - O. O-C
Pc%e#,-Hah f7a4 seec1eZ4-,mv'WeJ = o�Zl .4e C
"Eo,,i4,
ov,,d ' Lpplicd4f U, 87 /}G
Bcirc So•I = 0.3Z i4c G = 1.0
(0,5¢�O.o�+•(o.zc)(o.0t1 t �0. G��o,o��t (d, 2�(O.ac�t(o. 87x0 :3�+�0.3IJCl • 6,
C -
2.e0
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G= z.8v
7e hcc a4- 0.3U
0
U
4. r
•5EFF
Q P'Ced!^^C/lG4-lnSrdll J
0-29�-XO,50)1�100) z
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STEWART&kSSOCIATES
' Consulting Engineers and Surveyors
August 31, 1998
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 estimate of the cost of the erosion control for Riverside Centre.
1. 641 L.F. of Silt Fence 2 50 @ $ $ 1,603.00
' 2. Gravel Sediment Trap $ 150.00
3. Detention Pond Seeding 10,160 S.F. @ $0.06 $ 610.00
4. Disturbed Area Soil Stabilizer 53,200 S.F. @ 0.01 $ . 532.00
5. Reseeding Total Area Disturbed - 2.5362 acres @ $650/AC. $ 1,649.00
' Total $ 4,544.00
The collateral required is $ 2,895.00 X 1.5_ = $ 4,343.00.
If you have any questions regarding this cost estimate, please call.
'X3 111
Sincerely,
Richard A. Rutherford, �.E. L. S. * ; 5028
:
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
17
M
STEWARTMSSOCIATES
Consulting Engineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
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STEWART&ASSOCIATES
Consulting Engineers and Surveyors
November 2, 1998
Mr. Basil Hamdan
Storm Water Utility
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522-0580
Dear Basil,
This is to request a variance to the requirement limiting the depth of detention in a parking lot to 1 foot
for the RIVERSIDE CENTRE. There is a small area in the Northeast comer of the site where the concrete
pan discharges out of the parking area into the grass part of the pond which has a depth of 15 inches. It is
in the rear of Building "C" and will be used for employee parking. A sign will be placed at the area warning
drivers about the depth of detention.
If you have any questions regarding this matter, please call.
Sincerely,
Richard A. Rutherford, P.E. & L.S.
meh
Mkllk
�• T f�
•�G%STEW
RF
* 5028 t*
i 5''q•ea�i �~
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
k <-('/J
' EASEMENT DEDICATION
' KNOW ALL MEN BY THESE PRESENTS: That the undersigned being the owners and proprietors
of Lot 5, Block Two, Replat of Block Two, Upland's Prospect Business Park P.U.D., City of Fort
Collins, County of Larimer, State of Colorado do hereby dedicate and convey to and for public use
' forever a drainage easement that is described below, provided however, that acceptance by the City
ofFort Collins of this dedication of easement does not impose upon the City a duty to maintain the
easement so dedicated.
' The Southwesterly 10.00 feet of Lot S, Block Two, Replat of Block Two, Uplands
Prospect Business Park P.U.D., City of Fort Collins, County of Larimer, State of
Colorado which is adjacent to the Northeasterly right-of-way line of the Union Pacific
Railroad.
1
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Witness my hand and seal this a�_ day o A.D. 1999.
LOCKMAN ENTERPRISES, LLLP
Bye`" X1 e' �
Charles C. Lockman, Manager
STATE OF COLORADO)
)ss
COUNTY OF LARK ER)
The foregoing instrument was acknowledged before me this,2Z day of , A.D.
1999, by Charles C. Lockman.
Witness my hand and official seal.
My commission expires: 42-61 9i,�0a2
ATTORNEY'S CERTIFICATE
This I hereby certify that the within easement 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 easement 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 day of
, 199_ 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.
Signature: Address:
Registration No.
EROSION CONTROL PROCEDORES%
I.
R3E WESTERLY 110 FEET OF SITB (?N Xm) TO RCn+AIN uNDISTVRBED
Z.
PHASE 2 WILL BE G"OEP AND CONSTRUCTED WITH THE WEST /L
OF BVILDIN6"D' ➢LING CONSTRUCTED AND THE WINE AND
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PARKING AROUND THE WESTVL OF HVILDING"H° ONNO GRAVEL SOSO.
aIRO
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THE DETENTION PONOWO, AREA WILL HE GRAVED TO PROMO[
Sw11O
THE ENTIRE FONPING ^REA AIS SHOWN ON THIS PLAN, AND
av, ,
THE D9M1OING P DS FOR THE EASTfL Of RUIlDIN4"H AND DUILOIN6"C-
WILL HE CONSTRUCTED,
¢.
A ORAVLL SECONDARY gCCOSf PRI✓EVpY SHALL BE 1N LLED
AROUND THH EAST VL OF BWLDING "H" AND OUT TO RI✓HRSIDE /WC,
NGY•L
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THE DETENTION POMP LOL TED IN TNS GREEN AREA EAST OF
BVILDING"C "SHALL Be SEEDED AND MULCHED WITH NATIVE GRASS, O(.
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GRADED AREAS WHICH WILL DE FUTURE DVILO)N61 OR P(&WXE
PgVEM[Nr SHALL BE TREATED WITH GANTNDOUND"SOIL JTABIL/2ER
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AS PER TN[ Mp NVFACTVRERY RECOASMEN OgT10N5.
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INSrALL A SILT PENCE PWC THE NORTHERLY AND GASTERLYP SIM$
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OF We PROTECT PRIOR TO BEGINNING 6RADINO, THE SILT FEHCD MAY
BE REMOVED AFTER THE PETENTON MOND wA41f CONSTRDe=.
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INSTALL h GRAVEL SEDIMENT TRAP OVER TOE DETENTION
POND OUTLET IMMBOIATELV AFTER THE OUTLET IS CONATRUCLO.
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NOTES
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CHASE DETAIL
City of Fort Collins, Colorado
R.,vc !hc 'H' a 2h HxrS
uncm PUN aPP unL
APPROVED:
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