HomeMy WebLinkAboutDrainage Reports - 04/15/1994STEWART&kSSOCIATES
Consulting Engineers and Surveyors .
April 13, 1994
Mr. Glen Schlueter
Storm Water Utility
City of Fort Collins
P.O. Box 580
Fort Collins, Colorado 80522
Dear Glen:
Re: Mawson Lumber Company
Mr. Tom Moore of Mawson
building on his lumber yard
northwest of Lincoln Avenue,
of hard surface over an area
square feet gravel.
Lumber Company wants to construct a warehouse
site located northeast of Jefferson Street and
This proposed building will be 2688 square feet
.which is presently 1608 square feet dirt and 1080
I have calculated the total volume of additional runoff generated by this
new building for a 3—hour 100—year storm to be 420 cubic feet of water. The
additional peak runoff quantity from the 0.284 acre sub —basin around the new
building will be 0.20 c.f,s. for a 10—year storm and 0.59 c.f,s. for a 100—year
storm.
The runoff from the 0.284 acre sub —basin around the new building travels
southerly along the southwesterly side of a railroad spur for a distance of
170 feet to the northerly side of East Lincoln Avenue, and then easterly along
the northerly side of -East Lincoln Avenue for a distance of 400 feet to the
Cache la Poudre River. This drainage path along the southwesterly side of
the railroad spur is located on property owned by Mawson Lumber Company, and
the owner prefers not to dedicate an easement for the small amount of additional
flow generated by the proposed warehouse. The site is located in the Old Town
Basin.
Since the site is so close to the Poudre River and the additional runoff
is relatively small and will have negligible effect on the flow route between
the site and the river, we request that storm water detention not be required
for this new building.
I have included an aerial photo of the area showing the proposed building.
Also included is a more detailed plan of the site.showing existing buildings
and the proposed warehouse. Calculations of the additional runoff are also
included.
James H. Stewart
and Associates, Inc.
103 S. Meldrum Street
P.O. Box 429
Ft. Collins, CO 80522
303/482-9331
Fax 303/482-9382
Mawson Lumber Company__.'
Page 2
The site is located in a moderate rainfall and low wind erodibility zone.
The rainfall performance standard is 71.7 percent, and the construction of
the building pad and installation of a straw bale barrier in the downstream
drainage path will provide an erosion control effectiveness of 78.4 percent.
Wind erosion control is adequately provided by the existing_ structures adjoining
the site.
Please call if you need more information about this project.
Sincerely,
AW
;PM
Phillip Robinson, P.E. & L.S. C;•�
Vice President *� 4502
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Consulting Engineers and Surveyors ' A
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STEWART&tSSOCIATES -103 S. MEL9331 DRUM, FORT COLLINS, CO 80521
PH. 482-FAX 482-9382
Consulting Engineers and Surveyors
By: Date: Client: Mat-A/sar) tulv*tber o. Sheet No. of
Project: Ale L^/ vk/o(r e- 4o L) 5 C
Subject: Flo 6 U Q r) '5itr
n c 1 1, it
Basilrl 200 de. 91 3-7 101 LO k- o' i)
t 4-6
ye I! 1'q'7( Ua-
A/
Ll 66 7-
-J:� X I S -TV A) F<1VA10F.F.,
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-----------------------------
RAINFALL
PERFORMANCE STANDARD EVALUATION'
PROJECT:
av/so� Lumbers
S j17A
� e�1
_
STANDARD FORM A
COMPLETED
BY:
DATE: 3 g
DEVELOPED
SUBBASIN
-------------------------
EROOIBILITY
ZONE
Asb
( )
Lsb
(ft)
-------
Ssb Lb
M (feet)
Sb ! PS
q,
-- -- ---
-------- -
-------
)
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o �e
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0. Ze 9-
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70
-------
0, s7
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--(---I--�-�--
7/- 7%,
.
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--------------------------------------------------------------------
DI/SF-A:1939
EFFECTIVENESS CALCULATIONS
Y
PROJECT: McitJSdh Lumber S'0r4se Shed STANDARD FORM B
(COMPLETED BY: DATE:
Erosion Control
C-Factor
P-Factor
Method
Value
Value Comment
----------------------------------------------------------
I3are soi) .....
oG
bv1Jd(ng
0.01
9roLutI drNC
p.(U
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(.Op
GonL•.p
U U(
1_00
----------- ----------------------------------------------------------
MAJORI PS SUB AREA
BASIN
(%)
BASIN
(Ac)
CALCULATIONS
-----
TrrT/it
------
71.7
-----
------
()
------ -------------------------------------
buf lJi n
Sclrjvc..-
=. O. 001 ,4,
SiTF
6Cr-wvcl 0, I12
G � 7;,
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A-
bate
bare s0A
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A
------------------=-=------------------------------------------------�
I/SF-B:1989
CONSTRUCTION SEQUENCE
PROJECT: Acz„✓son Lymb,!�r' S--oLoje Sh.a . STANDARD FORM C
SEQUENCE. FOR 19 ONLY COMPLETED BY: DATE:. 1 -3 t?.g
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.
YEAR
---------------------- ----- MONTH- /}
---- ---- ---------=---T------- ---t -- ---} --- ---�
OVERLOT GRADING I i I 1 I T I i
WIND EROSION CONTROL
Soil Roughing
Perimeter Barrier &xisT,
Additional Barriers
Vegetative Methods
Soil Sealant
Other bld9, slab
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 bay slab -
VEGETATIVE:
Permanent Seed Planting
Mulching/Sealant
Temporary Seed Planting
Sod Installation
Nettings/Mats/Blankets
Other
---------------- -------------•
STRUCTURES: INSTALLED BY- rwtirinancu of
VEGETATION/MULCHING CONTRACTOR
DATE SUBMITTED
HDI/SF-C:1989 :.
APPROVED BY CITY OF FORT COLLINS ON
JA`UA_?Y 1991 8-20 DESIGN CRITERIA
STEWART$,ASSOCIATES 103 S. MEL9331DRUM, FORT gOLLINS, CO 80521
Consulting Engineers and Surveyors
By: P) rZ Date: I I� 4- Client: Aa U/Son l o m1 f r CO Sheet No. _ of
D_
Project: - F1'O�osec) SroraSC SIB d
Subject: Et-n s 1 on Co rt h-o l Cg3ls
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