HomeMy WebLinkAboutDrainage Reports - 03/14/1989STORM DRAINAGE REPORT
COLLINDALE BUSINESS PARK
MARCH 14, 1989
PREPARED FOR K. BILL TILEY
STEWART & ASSOCIATES, INC.
/L 214 NORTH HOWES
FORT
COLLINS, CO 80521
STORM DRAINAGE REPORT•
COLLINDALE BUSINESS PARk•
Collindale Business Park is within the Fox Meadow Drainage Basin. The
property is located on the west side of Timberline Road and extends west
to the Union Pacific Railroad. The property begins 1330 feet south of
Horsetooth Road and runs south approximately 1700 feet to the top of a
ridge. The Tiley property covers only the north 1330 feet, and the property
to the south belongs to Tom Chandler and Don Chadwick. The gross area
of the property, including the Chandler and Chadwick properties, the west
z of Timberline Road, and the East z of the Union Pacific Railroad R.O.W.
is 44.5 acres. There is no offsite run—off onto the site. The south
boundary is a ridge from which the drainage goes southerly to the Chandler
sump. Flows from the west are blocked by the Railroad embankment. The
north boundary is the low point and drainage flows east along this north
line. There is an irrigation ditch running east parallel to and about
six feet north of the north line. This ditch belongs to Bob Shields.
The ditch can.carry irrigation water from Warren Lake across the golf
course, under the railroad and along the north property line. Historically,
this ditch has carried storm drainage under the railroad from the golf
course and from .the railroad right—of—way. This flow from the golf course,
according to the Fox Meadows report is Q2=1.0 c.f.s. — Q10=3.0 c.f.s. —
Q100=9.0 c.f.s. per page 12 of the report. We propose to not distrub this
ditch or alter the flows which it now receives.
The attached map shows the entire 44.5 acres divided into 10 sub —basins
and a detention pond area, which are shown as parcels 1 through 10 on the
map. We propose to provide detention for parcels 1,4,6,7,8,9,10 and the
pond area. The total area being detained in the pond will be 44.5 acres
minus 5.7 acres in Parcel 2, minus 1.3 acres in Parcel 3, and minus 3.1
acres in Parcel 5, which equals 34.4 acres. Detention shall be provided
on site on parcels 2 and 3 for the difference between 2 year undeveloped
run—off and 100 year developed run—off. -Parcel 5, the'Chadwick property,
has a 10 year undeveloped run—off of 1.4 c.f.s. which will be carried
through the proposed drainage system to the detention pond, area. Future
detention must be provided on Parcel 5 when and if its present use is
changed. The undeveloped 10 year out —flow from Parcels 2 and 3 was used
to determine gutter flows because it is greater than the future allowable
out —flow when the Parcels are developed and on —site detention is provided.
These out —flows are shown on sheet 14 of this report. The proposed
detention pond is located at the northeast corner of the site. The outfall
from the pond will drain under Timberline Road to the east and then into
the Sunstone swale. The new pipe under Timberline Road is per the design
plans of the Fox Meadows Business Park Drainage Channel. We plan to carry
the storm runoff by overland flows to the detention pond. The majority
of the flow will be carried to the pond by a drainage swale which runs
to the north along the west side of Timberline Road.
Storm Drainage Report
Collindale Business Park
March 14, 1989
Page 2
The Collindale Business Park will be developed in phases. The first phase
will be the streets, Parcel 1, the drain swale along Timberline Road, and
the detention pond. The detention pond area will be used as a settling
basin for erosion control during the first phase construction period.
No outlet shall be connected to the Sunstone Swale before the streets and
grading on Parcel 1 are completed. At the time of connection, erosion
control may be needed to protect the outfall from sedimentation. A concrete
pan is to be placed in the drain swales to prevent erosion. Flow capacities
of these pans are calculated on sheet 13 of this report.
The attached calculation sheets show the run—off calculations from each
of the parcels, the allowable gutter flows, the allowable outflow from
the detention ponds, the required detention, and the volume of the pond.
Also, there are run—off computation sheets showing flows at design points.
These design points are shown on the attached map.
Out —flow from the detention pond will cross under Timberline Road in a
24 inch pipe which empties into the Sunstone swale. This 24 inch pipe
will also carry out —flow from the W.W. Reynolds property located directly
north of the Collindale Business Park. The W.W. Reynolds out —flow is
approximately 5 c.f.s.
There will not be a property owners association for this development,
therefore we propose that the .City of Fort Collins maintain the detention
area and channels. A 2 year or 2 growing season time period is required,
plus, acceptance by Stormwater Utility, prior to assuming maintenance.
Should the adjacent property owners desire to place more intense landscaping
in the detention area and channel than that required by the City, they
shall become responsible for placing and maintaining this additional
landscaping. All landscaping in the detention area and channels shall
be subject to approval by the Stormwater Utility, City of Fort Collins.
Office of STEWART & ASSOCIATES, INC. o(f•.+...,,.� 3�/S1dr9
Phillip I. Robinson, P.E. & L.S.
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