451 term project storm water design
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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 storm as specified by the College Station Unified Development Ordinance.

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451 Term Project: Storm Water Design

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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

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

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.


Alternative 1 enlarge spearman lake

Alternative 1: Enlarge Spearman Lake


Alternative 2 creation of a storm water detention pond

Alternative 2: Creation of a Storm Water Detention Pond


Quantity estimates

Quantity Estimates

Alternative 1

Alternative 2


Capital cost estimate

Capital Cost Estimate

Alternative 1

Alternative 2


Operating estimates

Operating Estimates

Alternative 1

Alternative 2


Overall cost estimate

Overall Cost Estimate

Alternative 2

Alternative 1


How will we pay for it

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.


Cost per household

Cost Per Household


Questions

Questions?


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