HomeMy WebLinkAboutDrainage Reports - 09/10/1997 (3)0
Final Apprlvad.R�pod
FINAL DRAINAGE REPORT
FOR
LOT 5, REPLAT BLOCK 2, UPLAND'S PROSPECT BUSINESS PARK P.U.D.
SPRING CREEK DRAINAGE BASIN
PREPARED FOR
ADVANCED DRAINAGE SYSTEMS
AUGUST 279 1997
PREPARED BY
STEWART & ASSOCIATES, INC.
103 SOUTH MELDRUM STREET
FORT COLLINS, COLORADO 80521
970/482-9331
'
Table of Contents
1-2
Report
'
3
Vicinity Map
4-5
Runoff Calculations
'
6-8
Detention Pond
'
9-12
Erosion Control
Pocket
Grading, Drainage Plan
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STEWART&&SSOCIATES
' Consulting Engineers and Surveyors
' August 27, 1997
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 Lot 5, Block 2, Replat ofUpland's Prospect
Business Park P.U.D., Fort Collins, Colorado.
' The site is in the Spring Creek Drainage Basin and is at the Northwest end of Academy Court.
' It lies between the Burlington Northern Railroad and the Union Pacific Railroad. Lot 5 contains
7.0410 acres.
' There was a Drainage Report and a Grading Plan for a part of Lot 5 that was approved
February 27, 1995. That plan had a 3.0 acre lot for outdoor storage. There were no buildings
planned in that site plan. The grading plan included a detention pond with an outlet to the
Northeast that required and offsite drainage easement prior to any issuance of a building permit.
It was not possible to obtain the easement, therefore the lot was not built on.
' In December 1996, Mr. Charles Lockman had the lot graded in a different drainage scheme.
Overlot grading was done to have the lot slope Southwesterly to the property line along the
Union Pacific Railroad and then Southeasterly in a swale a long the Union Pacific Railroad
' property line to the most Southerly comer of Lot 5. A berm was created along the lot line
common to Lots 4 and 5 which created a detention pond in Lot 5. A 15 inch diameter N-12
A.D.S. pipe was laid under the berm to drain the stormwater runoff from Lot 5 to Lot 4. Lot 4
was regraded in the same manner as Lot 5 and a swale along the railroad property line was
continued Southeasterly until it discharges into the existing 4 foot wide concrete channel along
' the Southerly line of Lot 4. A drainage easement across Lot 4 is enclosed.
After the grading was completed, Mr. Lockman had recycled asphalt placed on 4.19 acres of
' Lot 5. He has leased the property to Advanced Drainage Systems, Inc. for a small office and
outdoor storage of drainage pipe. A request for an Administrative Change for the P.U.D. was
submitted and subsequently denied due to more recycled asphalt being placed on the lot with no
' permission given by the City of Fort Collins. This drainage report and the grading and drainage
plan are being submitted to acquire approval from the Storm Water Utility at this time.
' 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 (2)
The runoff calculations are for the 4.17 acres of recycled asphalt, 0.02 acres of office and the
' remaining 2.85 acres of bare ground and weeds in Lot 5. The most Northwesterly 0.94 acres of
Lot 5 was not regraded. Top soil, from the area that was regraded, was stockpiled on a small part
of the 0.94 acres. The 0.94 acres slopes Southerly to the existing borrow ditch along the Union
' Pacific Railroad and then Southeasterly to the detention pond at the Southeast end of Lot 5. The
ground cover of this area is heavy weeds. There is no drainage trapped in that end of Lot 5. The
' calculations also include the runoff from half of the Union Pacific Railroad right-of-way.
The historic runoff rate from Lot 5 in the two year storm is 2.08 c.£ s. The 100-year runoff
' rate from the developed site is 15.96 c.£s. The required detention for the difference between the
two rates of runoff is 45,948 cubic feet. 47,638 cubic feet of detention volume is being provided
in the proposed detention pond. A headwall with a restriction plate with a 6'h inch by 6'/s inch
opening will replace the Northwesterly flared end section on the outlet pipe.
The high water line of the pond will be 4932.9 and the top of the berm will be 4933.9 to
' provide one foot of freeboard. A spillway will be provided at the driveway at elevation 4932.9.
It will spill into Academy Court and flow to existing curb inlets on both sides of the street near the
corner common to Lots 3 and 4. The office building will have a finish floor at elevation of 4934.4
' which will provide 1.5 feet of freeboard.
EROSION CONTROL: The site is in the moderate wind erodibility zone and in the
moderate rainfall erodibility zone. A gravel sediment trap will be placed at the outlet from the
detention pond. As stated above, the recycled asphalt has already been placed on 4.19 acres. The
remaining 2.85 acres is bare ground or undisturbed ground with weed cover. The only new
disturbance will be the construction of the foundation for the office building and the trenching for
utility services into the building. The office building will be a manufactured building that will be
placed very quickly.
The runoff calculations, mass diagram, erosion control calculations and the grading and
' drainage plan are included as a part of this report.
This drainage report and the design of the drainage system were made in substantial
compliance with the City of Fort Collins Storm Drainage Design Criteria and Construction
Standards.
Ifyou have any question during your review of this report, please call.
Sincerely,
' Richard A Rutherford, P.E. & L. S.'k 5 028
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STEWART&ASSOCIATES
Consulting Engineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
By: F" 4, 0— — Date: L /Z7/077 Client: A r,> r o DZA,'AIA Galy.LT, Sheet No. Hof
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STEWARr&&SSOCIATES 103 S. MELDRUM, FORT COLLINS, CO 80521
Consulting Engineers and Surveyors PH. 482-9331 FAX 482-9382
By: p_.AP-. Date: 6 Client:ApyAAler.C2 -DeAw,4&&.r�lrs SheetNo. of
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STEWART&kSSOCIATES 103 S. MELDRUM, FORT COLLINS, CO 80521
Consulting Engineers and Surveyors482-9331 FAX 482-9382
By: e, A-. Date: (.,L?,7197 Client: A r)v,4 Ale ac z>Dp--4/Aj4e-& 4xzsm-s Sheet No. (g of
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STEWART&JkSSOCIATES
Consulting Engineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
By: P 4 ie, — Date: 41z.71q? Client: ApyAvcrap SheetNo. -7—Of—
Project: Ln:z S,- R,5 PLATRcock- 4 ljr;�-s Bysilycgs--r A4.e& P. Zz
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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)
See Table 704 in this Report for C factors
24 = Weir Length L in feet
3.1 = Weir Coefficient
Weir Shape Broadcrested
Design Flow 33.26 (cfs)
Depth of
flow (ft)
Flow Over Weir
cfs
0.50
26.30
0.55
30.35
0.56
31.18
0.57
32.02
0.58
32.86
0.591
33.72
0.60
34.58
0.70
43.57
0.80
53.24
1.00
74.40
0100 maximum= 33.26 cfs
Crest 4932.8
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'
CONSTRUCTION SEQUENCE
PROJECT:
/ or Llt_
_- kEALnr 110.1-auef PjearP6CT BariNeu peek P(I V. STANDARD FORM C
SEQUENCE.
FOR 19 d? 7
ONLY COMPLETED BY: ,Q 4.o, DATE: J4it7,7,i447
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.
19s9 YEAR
'
'
----------------------MONTH
OVERLOT GRADING
WIND EROSION CONTROL
Soil Roughing
'
Perimeter Barrier
Additional Barriers
Vegetative Methods
Soil 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
Nettings/Mats/B1'ankets
Other
-----------------------------
STRUCTURES: INSTALLED BY
llnzlllnall Lw Y1
' VEGETATION/MULCHING CONTRACTOR
DATE SUBMITTED APPROVED BY CITY OF FORT COLLINS ON
' HOI/SF-C:1989
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JANUARY 1991 8-20 DESIGN CRITERIA
C61
RAINFALL PERFORMANCE STANDARD EVALUATION
------------------- -------------------------------------------------
PROJECT: LorS, Bt-.tc 2, Opt-4uos ,STANDARD FORM A
COMPLETED BY: A DATE: ,,,,� z , If
------------------------------------------------------
DEVELOPEDIERODIBILITY1 Asb Lsb I Ssb I Lb I Sb I PS
SUBBASIN I ZONE I (ac) I (ft) I (%) .1(feet) I (%) I ()
LD-TS I MonsRATEi 7.0¢AJ )91q' 1 19 i9' I o.s% 1
-----------------------
DI/SF-A:1939
EFFECTIVENESS CALCULATIONS
PROJECT: L oT S, B Lk 2, REPLAT OPLAAror 50SAVErr PAjek P- a- D. STANDARD FORM B
COMPLETED BY: A? A e- DATE: Tuna 2 /qq
Erosion Control C-Factor P-Factor
Method Value . Value Comment
B ARG Gleou,v,= /. 0 /. o 21 &.T Ac'
ROCYCL6D A. -pI444 d,oS b o 4.19 Ac-,
.S6Diu16N-r TRAP /.0 O.SO
RC-seETDING o.qs b a
MAJOR PS I SUB I AREA
BASIN ($) BASIN (Ac) CALCULATIONS
Lo7S 7z,,z... — I 7,04Ac
wry c- Ci,o x z •Ss) t
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W -r c P. = 0 . so
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0 lc 78.5 72.2
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MARCH 1991
DESIGN CRITERIA
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STEWAU&kSSOCWES
Consulting Engineers and Surveyors
August 27, 1997
Mr. Basil Hamdan
Storm Water Utility
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522
Dear Basil,
The following is the erosion control cost estimated for Lot 5, Replat of Block 2, Upland's
Prospect Business Park P.U.D.
1. Sediment Trap 1 @ $150 $ 150.00
2. Straw Bale Dikes 2 @ $75 $ 150.00
3 Reseed 1.93 Acres @ $1300/ Ac. $2,509.00
The escrow will be 1.5 x $2509 = $3764
If you have any questions regarding this estimate, please call -
Sincerely,
Gz,lt.,u,.c, U. CRZ6� -,c
Richard A. Rutherford, P.E. & L.S.
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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
5028
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