FLOOD08571

• County: Larimer
• Community: Fort Collins
• Stream Name: West Vine Drainage Basin
• Basin: South Platte
• Title: Major Drainageway Planning
• Date: 12/1/1980
• Prepared For: Fort Collins
• Prepared By: Engineering Professionals
• Contract/PO #: &&
• Floodplain - Doc Type: Floodplain Report/Masterplan

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RATE OF RU~OFF (e.f...J

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2. YR. a 100 YR, STORM
HYDROGRAPH AT cas RR.

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culvert improvements to transport peak rates of runoff from the
25 year desig~ storm were preliminarily designed and modelled.
The 25 year peak rate of runoff at Hanna Subdivision, assuming
full development of the basin with existing drainage facilities
(or lack thereOf), was detecmined to be 71Cl c.f.s. The same
design storm with the same development conditions and 2S year
drainage improvements created a peak of 1742 c,f.s.; a 145
percent increase over the peak with existing facilities. The
100 year peak rate of runoff at Hanna Subdivision, assuming
full development of the basin with existing drainage facilities,
was determined to be 1175 c.f.s. The sa~ design storm with
the same development conditions and 25 year drainage improvements
created a peak of 2628 c.f.s.; a 124 percent increase over the
peak with existing facilities.

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