451 Term Project: Storm Water Design

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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.

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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 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.
Quantity Estimates

Alternative 1

Alternative 2

Capital Cost Estimate

Alternative 1

Alternative 2

Operating Estimates

Alternative 1

Alternative 2

Overall Cost Estimate

Alternative 2

Alternative 1

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.