City of Groton

Project Team

Date: Fall 2020
UConn Students: Christina Konstantinidis, William Carta
UConn CLEAR: David Dickson, Michael Dietz


The Runoff Reduction Report

This report includes recommendations for green stormwater infrastructure practices at 3 sites in the City of Groton. Each site is displayed with an ArcGIS map of the recommended practice, detailed description of our recommendations, and an informational table. Each table shows an estimated drainage area, our recommended green infrastructure, annual gallons of runoff treated, nitrogen and phosphorus pollution reduction amounts, and the suggested size of each practice. These estimations were calculated based on the drainage area, annual rainfall estimates specific to Connecticut, and literature export values.


GSI Summary Table

The following calculations display the potential pollutant-reducing benefits if the practices identified within the report were implemented:

 

Site Location GSI Suggestion Drainage Area (sq. ft.) Annual Gallons Treated Annual Nitrogen Reduction (lb. N/yr) Annual Phosphorous Reduction (lb. P/yr) Suggested Practice Size [6 in. depth] (sq. ft.)
1 Police Department Rain Garden 1 5,968 157,127 1.63 0.21 990.64
Rain Garden 2 2,090 81,431 0.85 0.11 513.40
Tree Box Filter 3,093 55,052 0.573 0.072 N/A
2 Birch Plain Creek Wildlife Area Bioretention Area 1,684 44,449.05 0.461 0.058 279.540
3 Fire Department Bioretention Area 8,642 227,561.47 2.367 0.299 1,434.67

Totals

Total IC Disconnected (sq. ft.) Annual Gallons Treated Annual Nitrogen Reduction (lb. N/yr) Annual Phosphorous Reduction (lb. P/yr)
Total 21,477 565,510 5.88 1.27