HomeMy WebLinkAboutHORSETOOTH-TIMBERLINE PROPERTY - MASTER PLAN - 78-88 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORT6 •
STEWART&ASSOCIATES
Consulting Engineers and Surveyors
MASTER STORM DRAINAGE REPORT
HORSETOOTH—TIMBERLINE PROPERTY
This property is located at the southwest corner of East Horsetooth Road
and Timberline Road. The property was previously platted as the South
Collins Tech Center. The gross area of the site is 32.2 acres, and it
is located in the Fox Meadows Drainage Basin. The property drains to
the southeast, where an outfall into the Sunstone channel is proposed.
The only off site flow onto the site comes under the railroad from the
Collindale Golf Course. This flow is through an existing 24 inch pipe
under the railroad and then via an existing west to east irrigation ditch
along the south property line. This ditch crosses under Timberline Road
in an existing 24 inch RCP and then into Bob Shields' 21 inch pipe.
The total offsite flow, including run—off from the east z of the
undeveloped railroad right—of—way (2.2 acres) is 9.8 c.f.s. for the 100
year storm and 3.5 c.f.s. for the 10 year storm. This flow is presently
being carried by Bob Shields' ditch and pipe.
We plan to detain on the individual sites with out —falls into a storm
drainage system. This storm drainage system has been partially installed
at the north end of the property. The installation was begun per the
South Collins Tech Center plans.
The previous storm drainage report for South Collins Tech Center used
a run—off coefficient of 0.65, and the calculated detention requirement
for South Collins Tech Center and also the Collindale Business Park,
having a total area of 78.1 acres, was 10.7 acre feet. The coefficient
for the RH zoning is 0.70, so we will base this report on 0.70.
The attached computation sheets show the allowable run—off calculations,
the required total detention, and the proposed detention for the
individual parcels.
The attached map of the site shows drainage direction and quantities
and proposed basins.
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James H. Stewart
and Associates, Inc.
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214 N. Howes Street
PO. Box 429
Ft. Collins, CO 80522 J o F S/Zc�lee-
303/482-9331
STEonsultir�,(�3 erSs SOCIAFES
C®MPu���I®F� Cax1 Surveyors
214 N. Howes St. Ft. Collins, CO 80521 (303) 482-9331
By: Date 2h JdO.Client: V. W. TEf�/ 005 CU. Sheet No. L of S
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STEWAST&ASSOCIATES '
COMPUTATIONS Consulting Engineers and Surveyors
214 N. Howes St. Ft. Collins, CO 80521 (303) 482-9331
By: Date Z Client: V AA R,-Xrzal� CO. Sheet No. 3 of 5
Chkd By: Date Project: HorS.e+oor/in a Job No.
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