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# 451 Term Project: Storm Water Design PowerPoint PPT Presentation

451 Term Project: Storm Water Design. Id Gaffe. Hilary Brugger Stephen Kelly Anastasia Nugent Joseph Roberts. Level of Service Measures. Design storm water runoff system for a 1 hour, 100 year storm as specified by the College Station Unified Development Ordinance.

451 Term Project: Storm Water Design

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Id Gaffe

Hilary Brugger

Stephen Kelly

Anastasia Nugent

Joseph Roberts

### Level of Service Measures

• Design storm water runoff system for a 1 hour, 100 year stormas specified by the College Station Unified Development Ordinance.

• Using the Rational Method to determine a conservative calculation for the excess runoff:

• Design intensity for a 1 year, 100 year storm is 4.41 in/hr

• Design runoff coefficient for undeveloped and grassy areas is .355

• Design runoff coefficient for impervious surfaces is .945

### Estimate Demand

• 78098 cy is equivalent to 48.4 acre-feet.

• A pond with a maximum depth of 6 feet would be a 10 acre pond.

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### How Will We Pay For It?

• We will be paying for this via municipal bonds and grants.

• The grants that we believe we can receive will cover 20% of the capital cost.

• The other 80% will be covered using bonds with a 7% interest rate.