HomeMy WebLinkAboutDrainage Reports - 02/28/2000FINAL DRAINAGE REPORT
FOR
A-Z PARTY RENTAL
SPRING CREEK DRAINAGE BASIN
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1 FEB.23MM�i��
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PREPARED FOR
A-Z PARTY RENTAL - -- - -
JANUARY 24, 2000
PREPARED BY
STEWART & ASSOCIATES, INC.
103 SOUTH MELDRUM STREET
P.O. BOX 429
FORT COLLINS, CO 80521
TEL. 970-482-9331
FAX.970-482-9382
INDEX
1
Vicinity Map
2-3
Text of Report
4-10
Storm Water Runoff Calculations
11
Drainage Table
12-14
Swale & Channel Capacity Calculations
15
Rip Rap Calculations
16-20
Erosion Control Calculations
21-27
Water Quality Calculations
28
Riverside Avenue Overflow Calculations
Pocket
Grading Plan and Drainage & Erosion Control Plan
and Section "A" -"A"
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STEWART&kSSOCIATES (2)
' January 24, 2000 Consulting Engineers and Surveyors
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 storm drainage report for A-Z Party Rental which will be on Lots 5, 6, 7,
' 8, 9 & 10, Riverside Subdivision, Seventh Filing, City of Fort Collins, Colorado. The site contains 0.99
acres and is in the Spring Creek Major Drainage Basin.
' The site is bounded on the Southwest by Riverside Avenue, on the Northwest by the Pitkin
Outfall Channel, on the Northeast by the Union Pacific Railroad and on the Southeast by an existing
' industrial building. The site slopes from front to rear (Southwest to Northeast) at an approximate grade
of 1.6%. The ground cover is weeds and gravel.
The owners are proposing to construct a commercial building with asphalt parking and loading
areas. A dock high loading area is also included.
' The historic site is divided into two sub -basins. Historic Sub -basin I is the Northeasterly half of
the Riverside Avenue asphalt and the existing sidewalk which drains Northwesterly to the existing pan
which flows to the Pitkin Outfall Channel on the Northwest side of this site. Historic Sub -basin II is the
lot and the land between the back of the existing sidewalk along Riverside Avenue and the front property
line. Historic Sub -basin II drains Northeasterly to the existing Pitkin Outfall Channel at the rear of the
lot.
The developed site is divided into five sub -basins. Developed Sub -basin I is the Northeasterly
half of Riverside Avenue to the back of the existing sidewalk. Developed Sub -basin I will drain,
' undetained, Northwesterly to the existing pan which flows to the Pitkin Outfall Channel. Developed
Sub -basin II is the Southeasterly half of the proposed building and the parking and loading areas on the
Southeasterly side of the proposed building. Developed Sub -basin II will drain Southeasterly to the
proposed Extended Detention Pond A Developed Sub -basin III is the Northwesterly half of the building
and the loading area at the rear of the building. Developed Sub -basin III drains in a proposed Concrete
Channel to the Extended Detention Pond B. Developed Sub -basin IV is the existing Pitkin Outfall
Channel at the rear of the site. Developed Sub -basin V is the landscape area in the front of the building
and the landscape area on the Northwest side of the building. Developed Basin V drains undetained into
1 the Pitkin Outfall Channel.. Developed Basin V was created due to the regrading of the Pitkin Outfall
Channel to increase its capacity.
' Offsite Sub -basin "A" is the Northwesterly half of the existing industrial building on Lots 1, 2,
3 and 4 of Riverside Subdivision, Seventh Filing. The Northwesterly half of the roof of the building
t
James H. Stewart and Associates, Inc.
' 103 S. Meldrum Street • P.O. Box 429 • Ft. Collins, CO 80522
9,70/482-9331 • Fax 970/482-9382
(3)
' drains to four down spouts on the Northwest side of the building. There also is an asphalt driveway
between the building and the property line which also sheet flows onto this site.
' The Southwesterly 30.00 feet of the Union Pacific Railroad right-of-way drains into the Pitkin
Outfall Channel undetained. This 30.00 foot strip has historically drained into the Channel and therefore
tthe runoff was not calculated as it does not affect this site.
The Pitkin Outfall Channel was designed by the City of Fort Collins in 1981. The proposed finish
' floor elevation is 1.00 foot higher than the spillway over the railroad which will mitigate the flooding
potential on this site from the Pitkin Outfall Channel. The regrading of the Pitkin Outfall Channel
increases its capacity to carry the 543 c.f.s. in the 100 year storm. A drainage easement is being
dedicated surrounding the proposed building for the 100 year runoff to reach the Pitkin Outfall Channel
without causing any rise in the water surface elevation. Section "A" -"A" is along the front of the
proposed building and the existing building to the Northwest of the site. The section is delineated in the
' pocket of this report. Due to the regrading to increase the capacity of the Pitkin Outfall Channel, a
variance is requested to permit a 3:1 slope along the Southeasterly line of the parking area and also on
the Southeasterly line of the 36 inch R.C.P. as it discharges into the channel.
EROSION CONTROL: The site is in the moderate rainfall erodibility zone and in the moderate wind
erodibility zone. The erosion control measures will be to not disturb the Pitkin Outfall Channel at the
rear of the lot and to place a silt fence along the Northeasterly property line and along the Southwesterly
he of the Pitkin Outfall channel at the rear of the site. The regraded part of the Pitkin Outfall Channel
' along the Northerly line of the site will be re -seeded. Also gravel base material will be placed on apart
of the site to raise the effectiveness to the required level. Extended detention ponds for water quality
will be constructed for both Basins 11 and III.
tThe phasing of the construction will be, to first strip the site and then rough grade the site
including building the pad for the structure. The two extended detention ponds will also be graded at
' that time but will not be functional until the walls on the Channel side of the ponds are constructed.
Secondly the gravel base will be placed on the staging area. Thirdly the concrete foundation will be
constructed. Then the asphalt parking area and the concrete slab and walks will be constructed. The
last erosion control measure will be the landscaping. This phasing is shown on the Construction
Sequence.
' The stormwater runoff calculations and the extended detention and erosion control calculations
are included as a part of this report. Also the Grading, Drainage and Erosion Control Plan is enclosed
as a part of this report.
' This drainage report and the design of the drainage system 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, " ' ..s*
0jard%A'�Ruther-ford, P.E. & L.S.: 5Q28
.
]tAR/meh '
is .'.•�.' & 4��.'sy
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CONSTRUCTION SEQUENCE
IROJECT: A. -7 REAJTAG Le7J S-s• /0� let jear ce gun.7>k• STANDARD FORM C
iEQUENCE FOR 19 CL ONLY COMPLETED BY : R , i¢ , PATE : OG'T7 L, 19991
ndicate by use of a bar line or symbols when erosion control measures will be installed.
Hajor modifications to an approved schedule may require submitting a new schedule for
�pproval by the City Engineer.
19 9q YEAR
MONTH I F I M
WERLOT GRADING
'IND EROSION CONTROL
Soil Roughening
Perimeter Barrier
'Additional Barriers
Vegetative Methods
Soil Sealant
' Other
INFALI 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
EXTENDED D57,51V770,U
VEGETATIVE:
Permanent Seed Planting
Mulching/Sealant
Temporary Seed Planting
Sod Installation
Nettings/Mats/Blankets
' Other
N
[RUCTURES: INSTALLED BY MAINTAINED BY
GETATION/MULCHING CONTRACTOR
TE SUBMITTED APPROVED BY CITY OF FORT COLLINS ON
MARCH 1991 8-16 DESIGN CRITERIA
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CONSTRUCTION SEQUENCE
PROJECT: A -7- F/Ar-ry 1REar41- /.ors s--+lO KkVEr-s1cEla.7ry STANDARD FORM C
SEQUENCE. FOR 30 Z000 ONLY COMPLETED BY: ..19 4 e DATE:
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.
Z000YEAR
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
. EXAU DED DE TE.Vj10.t)
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STRUCTURES: INSTALLED BY' MAINTAINED BY .
VEGETATION/MULCHING CONTRACTOR
DATE SUBMITTED. APPROVED BY CITY OF FORT COLLINS ON
HDI/SF-C:1 89
VEGETATIVE:
Permanent Seed Planting
Mulching/Sealant
Temporary Seed Planting
Sod Installation
Nettinas/Mats/Blankets
Other
ITIF IAlt 1A IM IT
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RAINFALL PERFORMANCE STANDARD EVALUATION
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PROJECT: q-Z )eE-vr4e.,40rs 9"vser1Pclv6.,7rrs STANDARD FORM A
(COMPLETED BY: 44e. DATE: G q
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IDEVELOPEDIERODIBILITYI Asb I Lsb I Ssb I Lb I Sb I PS
ISUBBASIN I ZONE I (ac) I (ft) I (%) .((feet) I (o) I (o)
---------I-----------I-------I-------I-------i-------I-------I-------
TT-- MOD6Kk>E i 0,4'4acl Z/�F I Z,//p
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EFFECTIVENESS CALCULATIONS
PROJECT: ,Q -z pq,e7 y )0,,w,VT,4 c , Lo:r ,r--►1o,ewLX a6_Qft. Inv STANDARD FORM B
COMPLETED BY: /e A-1, DATE: G1-71-79
Erosion Control
C-Factor
P-Factor
Method
Value
Value Comment
BAP-E SolL-
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S ILT FEAUCE
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0.80
MAJOR PS SUB I AREA
BASIN ($) BASIN (Ac) CALCULATIONS
SG2lN& -76 8O� ZC E0•1-4A4 Foes SO1I_ D,ZZ 4c,
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F0u,up4Tt0,J
WTp C FA`rap _ (1,00X 0,ZZ)4-(8.OIx 0./1 4- (0.05-X0,/1a
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DFBIFN CRITFRIA
STEWART&tSSOCIATES
Consulting Engineers and Surveyors
October 12, 1999
Mr. Basil Hamdan
Fort Collins Utilities
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522-0580
Dear Basil,
The following is the cost estimate for the erosion control measures for A-Z Party Rental on
Lots 5, 6, 7, 8, 9 & 10, Riverside Subdivision, Seventh Filing, Fort Collins, Colorado.
1. Silt Fence 375 L.F. @ $3.00 $ 1,125.00
2. Extended Detention Pond - 2 @ $500 $ 1,000.00
3. Gravel Base 725 S.Y. @ $2 / S.Y. $ 1,450.00
Total Estimate of items 1-3 $ 3,575.00
4. Reseeding 0.76 Acres @ $1300 / Ac. $ 988.00
Escrow For Site = $3,875 X 1.5 = $ 5,363.00
If you have any questions regarding this estimate, please call.
Sincerely,
�..� a.c
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
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STEWART&6SOCIATES 103 S. MEL9 3DIRUM,FAX FORT gOLLINS, CO 80521
Consulting Engineers and Surveyors
By: If A 2. Date: 0 i Client: A -Z. FF,4/P r�z REtirA,_ Sheet No. ? tt of
Project: Lo-rs S G _7, R 9 > /� �IVF/e-l/na (28PIV/T/ r Sr=v6vrr FIL-/n/�
Subject: S70 m Dg INA (tJ AT i2 0ALI7-�/ ( 11LC-itLAT1n^iS
ExrE-:-ND v E-Tl511)r101J. Po,vo Sv-s $AS -IA)_
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DRAINAGE CRITERIA MANUAL (V. 3)
STORMWATER QUALITY MANAGEMENT
EXTE.vTDED U ErE:A.; oAj
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9-1-1992
UDFCD
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Percent Impervious Area in Tributary Watershed
Source:Urbanos, Guo, Tucker (1989)
Note: Watershed inches of runoff shall apply to the
entire watershed tributary to the BM0 Faciliry,
FIGURE 5-1. WATER QUALITY CAPTURE VOLUME (WQCV)
DRAINAGE CRITERIA MANUAL (V. 3)
(z3)
STRUCTURAL BMPs
m 0.6(
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Source: Douglas County Storm Drainage and Technical Criteria,1986.
FIGURE 5-3.. WATER QUALITY OUTLET SIZING: DRY EXTENDED DETENTION
BASIN WITH A 40-HOUR DRAIN TIME OF THE CAPTURE VOLUME
9-1-1992
UDFCD
STEWART&6SSOCIATES 103 PH. S. ME 9 RFAXFORT COLLINS, CO80521
Consulting Engineers and Surveyors
By: ,4 r�' Date: /0 1 Client: A. -Z PA p--ry R Ey7-AL Sheet No. Z4- of
' Project: (,nTS / 70 8) 9 /D �f�/EesiDE ,(�yFSi�i✓irio�� rCyEVTN�..u.
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Note: Watershed inches of runoff shall apply to the
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FIGURE 5-1. WATER QUALITY CAPTURE VOLUME (WQCV)
DRAINAGE CRITERIA MANUAL (V. 3) STRUCTURAL BMPs
XTE4)DED DETE.Vr/0A) IBCAvp $" ._v8 BAXi.J1�
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FIGURE 5-3. WATER QUALITY OUTLET SIZING: DRY EXTENDED DETENTION
BASIN WITH A 40-HOUR DRAIN TIME OF THE CAPTURE VOLUME
9-1-1992
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STEWART&ASSOCIATES 103 S. MEL93DRUM,
FORT COLLINS, CO 80521
PH. 482-FAX 482-9382
Consulting Engineers and Surveyors
By: .1E 4 Ae-- — Date: z 7 Client: A - 7- FA F-- -r y E,5 A, rAt Sheet No. 7--7of—'
Project: L o7-,r 5,- 6,% )a , R1V&pes1c>c-7 -r1SyeFAjrr-1
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STEWART&ASSOCIATES - 103 S. MELDRUM, FORT COLLINS, CO 80521
Consulting Engineers and Surveyors482-9331 FAX 482-9382
By: Date: Client: 4 - 7 pfar--r�j Pe /ii r AL- Sheet No. 7Z t3 of_
Project: :Z' B, 9, )0-. fet
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LEGEND
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RE LINE
STORY DWI UNE
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DRAINAGE TABLE
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UTILITY PLAN APPROVAL o a
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UTILITY PLAN APPROVAL o
APPROVED:
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