1. Stormwater Corps
  2. Town Projects
  3. Town of Groton

Town of Groton

Project Team

Date: Fall 2020
UConn Students: Tyler Metsack, Sarah Schechter
UConn CLEAR: David Dickson, Michael Dietz

The Runoff Reduction Report

This report includes recommendations for green stormwater infrastructure practices at 4 sites in the Town 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 Senior Center / Public Library Rain Garden 1 8,493 33,976 2.32 0.2947 704
Rain Garden 2 8,886 35,544 2.43 0.308 783
2 Public Housing Authority Pervious Paving / Precast Slabs 20,865 83,460 5.71 0.724 15,071
3 Poquonnock Plains Park Speed Bump / Grass Swale 8,145 43,560 2.98 0.378 1,352
Plastic Grid 1 40,075 43,560 2.98 0.378 17,380
Plastic Grid 2 40,075 43,560 2.98 0.378 39,639
Rain Garden 13,854 55,408 3.79 0.48 1,150
4 Town Hall Annex / Police Station Biorention Basins 317,814 1,270,209 86.9 11.02 52,713

Totals

Total IC Disconnected (sq. ft.) Annual Gallons Treated Annual Nitrogen Reduction (lb. N/yr) Annual Phosphorous Reduction (lb. P/yr)
Total 418,130 1,522,157 3103.38 13.20