HomeMy WebLinkAboutDrainage Reports - 12/12/1994•
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STEWART&\SS
Consultin3 En3ineers and Surveyors
December 7, 1994
Mr. Basil Hamdan
Storrnwater Utility
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522
Dear Basil:
The Saturn automobile dealer located at the southeast corner of South
College Avenue and Foothill Parkway desires to make an addition to his building.
The proposed building addition is 1177 sqaure feet, and the net addition
of hard surface will be 835 square feet.
This site is located at the northwest corner of the Foothills Fashion
Mall and is in the Foothill Drainage Basin . The site is platted as Tract D
of Southmoor Village, Fifth Filing. The site is labeled Empire Savings on
the included map of the Foothills Fashion Mall Expansion Storm Drainage. The
site is located within Areas 12 and 16 on this storm drainage map.
The Storm Drainage Report for the Foothills Fashion Mall Expansion used
a C factor of 1.0 for Area 12, and a C factor of 0.95 for Area 16 to calculate
the developed runoff quantities from these two areas . Therefore, the maximum
runoff quantity from these areas was used for the design of the drainage
facilities through the Foothills Fashion Mall. The addition to the Saturn
building will not increase runoff quantities or volumes over those used for
design .
Runoff from the sit e drains on the surface to Foothills Parkway where
it enters ex isting inlets and pipes. The pipe system carries water to the
east side of Stanford Road, where it enters a drain ditch that runs to the
Southmoor Village regional detention pond, located on the west side of Lemay
Avenue . The inlets along Foothills Par kway will overflow during a 100 year
storm and this overflow, which will include the additional runoff generated
by the Saturn addition, will flow east through surface flow paths provided
across the Foothills Fashion Mall Expansion. This surface flow goes through
a small detention pond which was constructed in 1989 by the Foothills Fashion
Mall Expansion. The capacity of this pond, per a 1989 certification survey,
i s 17,002 cubic feet, and the required volume was 15 , 782 cubic feet , leaving
an excess volume of 1,220 cubic feet. In 1990 when the Empire Savings building
was changed to the Saturn dealersh i p, additional paving was constructed. This
additional paving generated 405 cubic feet of runoff which drains to the
detention pond, thus reducing its excess volume to 815 cubic feet .
James H. Stewart
and Asso c iates , Inc .
103 S. Meldrum Stree t
P.O . Bo x 429
Ft . Collins , CO 80522
303/482-9331
Fax 303/482 -9382
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December 7, 1994
Page 2
The proposed addition to the existing Saturn building will generate 150
cubic feet of additional runoff during a 100 year storm. This 150 cubic feet
of additional runoff can be handled by the existing detention pond's 815 cubic
feet of excess capacity.
The 100 year runoff from the existing Saturn site, per the 1990 drainage
report, is 4.37 cfs, and the 100 year runoff from the Saturn site with the
proposed building addition is 4.47 cfs. This additional runoff of 0. 10 cfs
will have negligible impact on downstream drainage facilities.
Included in the appendix is a copy of the 1990 Saturn drainage report.
Also included is a copy of the 1987 Storm Drainage Report for the Foothills
Fashion Mall Ex pansion, and a plan of the small detention pond constructed
by the Foothills Fashion Mall Expansion in 1989.
During construction, the area where the new addition is located will be
stripped and the concrete foundation will be constructed immediately, so any
bare soil e x posure will be brief. A silt fence shall be installed along the
existing curb on the downstream side of the construction. This silt fence
location is shown on the enclosed map of the Add i tion. The silt fence shall
remain in place as long as there is bare soil. The contractor shall be required
to clean off all debris and mud tracked onto pavement. All erosion control
must comply with City Criteria.
The cost of the silt fence will be appro x i mately $200.00. Therefore,
the minimum erosion control collateral of $1,000.00 will be required.
Sincerely,
enclosures
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Attach Securely t.o Post
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Runoff
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SECTIO~ VIEW
General Notes:
1. The maximum tributary area is limited
to 0.25 acres per 100 feet of fence. SILT FENCE
PAGE 37
2. Inspect and repair fence after each
storm event. Remove sediment when
one half the height of the fence has
been fil led. Removed sed iment shall
CITY OF JORT COLLINS, COLORADO
STORMWATER UTILITY
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be deposited in an area tributary to a
sediment basin or other filtering
measure .
FIGURE 6. 7
APPROVED BY:
DATE :
REVISION S: 0-28
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STEWART&\.SSOCIATES 103 S . MELDRUM, FORT COLLINS , CO 80521
PH . 482 -9331 FAX 482 -9382
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STEWART&\SSOCIATES .
Consulting Engineers and _ Surveyors
Nov e mber 6, 1989
Mr. Blen Schlueter
Storm Water Utility
City of Fort Collins
P. 0. Box 580
Fort Collins, Colorado 80522
Dear Glen:
I have surveyed the finish grade ·elevations of the storm water
detention pond located at the east edge of Tracts Four and Five of the
Footh i lls Fashion Mall Expansion. This pond is just west of Stanford
Road, and is .shown on Sheet 12 of 18 of the Utility Plans for the
Footh i lls Fashion Mall Expansion Phase II.
The planned outlet grate elevation was 4995.00, and the surveyed
elevation is 4995.08. The overflow spillway elevation was planned to
be 4997.40, and is surveyed as 4997.24. The required volume is 15782
cubic feet, and the revised plan volume of the pond was 17400 cubic feet.
The volu me I have calculated from our survey made November 6, 1989, is
17002 cubic feet. This as-built volume of 17002 cubic feet is less than
the pl anned volume of 17400 cubic feet, but it is quite a bit greater
than the required volume of 15782 cubic feet; therefore, the pond is
adequately ~9nstructed.
Please call if you have any questions.
Sincerely,
Phillip I. Robinson, P.E. & L.S.
Vice President
jrr
cc: Mr. Mike Herzig, City of Fort Collins Development Coordinator
Mr. Ron Young, Everwest Partnership
James H. Stewart
an d Associates. Inc .
214 N. Howes Stree t
PO. Box 429
FL Coll ins. CO 80522
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DRAINAGE REPORT
FOR
SATURN OF FORT COLLINS P.U.D.
STEWART & ASSOCIATES, INC .
JULY 19, 1990
STEWART&t\.SSOCIATES
Consulting Engineers and Surveyors
• July 19, 1990
•
Mr. Glen Schlueter
Storm Water Utility
City of Fort Collins
P O Box 580
Fort Collins, CO 80522
Dear Glen:
This is the storm drainage report for Saturn of Fort Collins P.U.D. The site
is for a proposed automobile dealership at the Southeast corner of South
College Avenue and Foothills Parkway. • The site contains 0. 713 acres and is
zoned Highway Business. The building was previously occupied by Commercial
Federal Savings and Loan.
The site is located in the Foothills Drainage Basin. It was included in the
Storm Drainage Study for the Foothills Fashion Mall Expansion prepared by
Stewart and Associates, Inc. dated July 20, 1987. The Saturn of Fort Collins
P.U.D. was a part of Area 12 and a part of Area 16 of the Fashion Mall Study.
The proposed P.U.D. has only minor changes to the site plan as related to
storm drainage runoff quantities. Approximately 1000 square feet of asphalt
paving is being added on the West side of the building. Also, approximately
1200 square feet of turfstone is being added for automobile display on the
East side of the building.
The runoff coefficient for the existing site is 0.66 and the runoff coefficient
for the proposed P. U. D. increases to 0. 70. The impervious area increases
by 3.2% and the turfstone area is 3.9%.-
The 2 year runoff increases by 0.07 c.f.s. and the 100 year runoff increases
by 0.25 c.f.s. when the increase in impervious area takes place. This increase
in flows increases the volume of runoff in the 2 year storm by 200 cubic feet
and in the 100 year storm by 405 cubic feet. The detention _pond that was
built at the Northwest corner of vacated Foothills Parkway and Stanford Road
has 1220 cubic feet greater detention capacity than required according to
a letter from Phillip I. Robinson to you dated November 6, 1989. The
additional volume in the detention pond will accomodate the 405 cubic feet.
In the Foothills Mall Expansion study Areas 12 and 16 used a runoff coefficient
of 1.0 and 0.95 respectfully to determine runoff. The North½ of the proposed
P.U.D. is located in Area 12 and its runoff flows to -an existing inlet in
the South curb of Foothills Parkway. The South½ of the proposed P.U.D. is
located in Area 16 and its runoff flows to an existing inlet at the Northerly
most corner of the Sears front parking lot .
Jam es H. Stewart
and Associates. Inc .
214 N. Howes Street
PO . Box 429
Ft. Collins. CO 80522
303/482-9331
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Saturn of Fort Collins P.U.D. Storm Drainage Report
July 19, 1990
Page 2
Since the calculations for Areas 12 and 16 were made using the H.B. zoning
coefficient of runoff and the actual coefficient for the existing site and
proposed site are significantly less, we are requesting thai no onsite
detention be required. Likewise we are requesting that no basin fees be
assessed. The Fashion Mall storm drainage system was determined in the
Expansion study to be able to handle the runoff from Areas 12 and 16 and that
runoff will not be exceeded by this proposal.
The runoff calculations and the site plan and the Drainage Plan for the
Foothills Fashion Mall are included as a part of this report.
If you have any questions regarding the report or the requests for no onsite
detention or basin fees, please call.
Sincerely,
Richard A. Rutherford, P.E. & L.S.
President
lkk
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STEWART&\.SSOCIATES
Consulting Engineers and Surveyors
STORM DRAINAGE REPORT
FOOTHILLS FASHION MALL EXPANSION
The Foothills Fashion Mall Expansion is located east of South College
Avenue to Stanford Road and south of Swallow Road to Monroe Drive. The
mall was constructed in 1973, and storm drains were constructed in the
thalweg of the Foothills Basin. Most of the run-off from the Mall area
goes to this storm drain. A portion of the drainage from the area south
of Monroe Drive goes to Warren Lake . .Detention has been provided at
Lemay Avenue for the Southmoor Village Subdivisions, which cover most
of the Mall. The Arena area south of Monroe Drive drains to Warren Lake.
Through an agreement between Mitchell and the Warren Lake Company, all
drainage from the Arena area can be carried directly to Warren Lake.
There is, however, a small area (2.04 acres) lying south of Monroe Drive
which will not drain to Warren Lake and which apparently was not included
in the Southmoor Village detention calculations. Detention quantity
calculations for this 2.04 acres is shown on page 3 of this report.
This 2.04 acres is to be paved as a part of the parking lot and will
drain north through the Mall drain pans. We are providing a temporary
detention pond for this added run-off in the parking lot at the southwest
corner of Foothills Parkway and Stanford. There is an existing inlet
at this point, and a berm will be constructed in the landscaped area
to provide the necessary detention volume. Calculations for this are
shown on page 9 of this report. A permanent detention pond to hold the
volume required shall be constructed in the green area proposed at the
northwest corner of Foothills Parkway and Stanford. This permanent pond
will hold the required detention volume as per the calculations for Area
2 on page 5 of this report.
There will be no significant changes in the existing drainage
patterns along the Foothills Parkway area of the Mall. Also, there is
no offsite contribution to this area.
The Monroe drainage will be changed some by the construction of
the parking lot and by the elimination of the west to east drain pan
across Stanford Road. The 2.04 acre unpaved area now lying south of
Monroe will be paved and will drain through the parking lot pan. The
unpaved area at the present time probably does not drain due to the fact
this is an isolated high point surrounded hy curbs and raised pavement.
The south half of · existing Monroe Drive and one acre of the Chisholm
site now drains across Stanford to the east in a pan at the south side
of Monroe. This pan is to be eliminated and the water will be routed
from the Stanford-Monroe intersection into the Mall drain pan running
north along the west side of Stanford. Cross Sections and flow
James H. Stewart
and Associates, Inc .
214 N. Howes Street
PO . Box 429
Ft. Collins , CO 80522
303/482-9331
-1-
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calculations for this pan are shown on page 11 of this report. There
are no off-site run-off contributions to the Monroe Drive area. College
Avenue and the Larimer County No. 2 Ditch stop the 100 year flow from
the west. The run-off from the east half of College Avenue drains into
the site on Foothills Parkway and on the north flow line of East Monroe,
and is picked up by catch basins at the Larimer County No. 2 canal and
over the existing 54 inch drain. The only part of the drainage from
College Avenue which will be changed by this project is the flow onto
the north flow line of East Monroe. Originally this flow (from 0.5 acres)
went across Monroe to the south in a drain pan, and then into the Larimer
County No. 2 Canal. The offsite street improvements require the removal
of this drain pan, and so we have turned the drainage around the corner
onto Monroe, and then through the Mall parking lot drainage system.
The 0.5 acres is very small conpared to the total south parking lot
drainage, and its affect on the overall drainage is insignificant.
The attached map shows the Foothills Mall, Foothills Square and
Arena areas. The contours shown on the map are finish contours. Also
shown are existing and proposed storm drains. The new storm drains
consist of an 18 inch line at the east end of the Foothills East area,
relocation of 18 inch drain line under Mervyn's, a new 18 inch overflow
line along the north side of Mervyn's, and some lines from the new catch
basins to be constructed along Foothills Parkway.
The map shows drainage sub basins, for which the drainage
calculations are shown on the following calculations sheets.
The area is divided into 18 sub basins which are shown and numbered
on the attached map. Calculations for these basins are shown on the
following calculation sheets.
The area which drains south to the Horsetooth-Stanford intersection
is 2.8 acres in size. We propose that this area drain in the west gutter
of Stanford to the catch basins at the northwest corner of the
intersection. This drainage quantity, gutter capacity and catch basin
capacity are calculated on page 12 of this report.
In conclusions, after doing the calculations, familiarizing myself
with the site and going through previous drainage plans, I feel the
Expansion of the Foothills Fashion Mall will make negligable changes
on the downstream drainage. There are no off-site flows which will have
any affect. The Foothills Parkway area (Phase II) all drains directly
into the storm drainage system, therefore all potential drainage problems
are easily solved in this area. The south parking lot, Phase I, has
had problems in the past of the pavement deteriorating due to an asphalt
drain swale on a fairly flat slope. The new plan proposes this drainage
to be in a concrete drive and in concrete gutters and pans. Also the
slope of the asphalt has been made steeper to create better flow to the
concrete swa les .
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COMPUTATIONS STEWART&\SSOCIATES
Consulli113 E113ineers and Surveyors
. • ..
214 N. Howes St. Ft. Collins,. CO 80521 (303) 482-9331
....,,,_P_,_I_._B,__,___ Date 7,/ zo Je--, CI ient: Eve,::w:::es f-Sheet No. 3 of_.._l-=2;____
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COMPUTATIONS STEWART&t\SSOCIATES
Consultin3E.n3ineersand Surveyors
214 N. Howes St. Ft. Collins, CO 80521 (303) 482-9331
Pl 13, Date 7 /2J:J)r7 Client: Evei<:vvE ST Sheet No. 4= of __._I c..=---r . I
__ Date ___ Project: FC)cA--hil/s f-9sh /v~ Afc,. // ~~ or,S-/0'"7
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COMPUTATIONS STEWART~SSOCIATES
Consulti113 E113ineers and Surveyors
214 N. Howes St. Ft. Collins, CO 80521 (303) 482-9331
Pl& Datel/2.r/)1}7 Client: EvE~vvl=:.ST SheetNo. > of le. r ,
___ Date ____ Project: Foo±tzil/..5 £a sJ., ioV'\ M&i \) ·Ex.. p o.-ns t'o vi
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Consullin3 En<3ineers and Surveyors
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Consultin3 E.n<3ineers and Surveyors
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Consult in3 En3ineers and Surveyors
214 N. Howes St. Ft. Collins, CO 80521 (303) 482-9331
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