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451 Term Project: Storm Water Design

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

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  1. 451 Term Project:Storm Water Design Id Gaffe Hilary Brugger Stephen Kelly Anastasia Nugent Joseph Roberts

  2. 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

  3. 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.

  4. Alternative 1: Enlarge Spearman Lake

  5. Alternative 2: Creation of a Storm Water Detention Pond

  6. Quantity Estimates Alternative 1 Alternative 2

  7. Capital Cost Estimate Alternative 1 Alternative 2

  8. Operating Estimates Alternative 1 Alternative 2

  9. Overall Cost Estimate Alternative 2 Alternative 1

  10. 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.

  11. Cost Per Household

  12. Questions?

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