Emphasis: Water Resources

Sponsor: Riverton City

Scope:

•      Determine the 85th percentile, storm for Riverton City.  A dry period of 6 hours defines a new storm.  Exclude storms totaling less than 0.1" and greater than 99.5%. Exclude snow storms. Exclude storms lasting longer than 24 hours.  If this varies significantly from west to east provide recommendations for how to distribute storm(s) over the City.
•      Determine the pre-development hydrology for Riverton (Riverton soils and vegetation) during the 85th percentile storm for Riverton undeveloped ground for grades for 0.5%, 2% and 5%.
•      For comparison determine the pre-development  hydrology for typical Riverton farm property during the 85th percentile, storm for ground grades of 0.5%, 2% and 5%.
•      Recommend urban development designs that can accommodate the runoff volumes that must be retained on the site to match the pre-development  hydrology. Address public safety, health, nuisance, liability and maintenance of the designs.  Use the City drafts attached as a suggested starting point.
•      Recommend  other low impact development (LID) designs that will minimize the negative impacts of retaining the pre-development hydrology volumes.  Including but not limited to: Complete private property retention, rural designs, minimization of public impervious infrastructure  etc.

Documents:

RFP

Final Report

Poster

Presentation