Cromwell

Project Team

Date: Fall 2021
UConn Students: Rachael Ruggiero, Phoebe Mrozinski
UConn CLEAR: David Dickson, Michael Dietz


The Runoff Reduction Report

This report includes recommendations for green stormwater infrastructure practices at 5 sites in the town of Cromwell. 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 Woodside Intermediate Rain Garden 1 22,477 591,890 6.15 0.78 3,746
Rain Garden 2 10,237 269,546 2.80 0.36 1,024
Rain Garden 3 6,316 166,320 1.73 0.22 631
2 Town Hall Rain Garden 1 1,612 42,423 0.44 0.06 268
Rain Garden 2 3,964 104,384 1.08 0.14 329
3 Cromwell Middle School Rain Garden 6,795 178,919 1.86 0.24 1,176.12
Pervious Asphalt 21,300 560,843 5.83 0.74 4,225
4 Edna Williams Elementary Drywell 1 6,185 162,862 1.69 0.22 254
Drywell 2 9,946 250,028 2.60 0.33 254
Drywell 3 11,194 294,758 3.07 0.39 254
5 Cromwell High School Tree Box Filters 10,367 272,966 2.84 0.36 N/A
Rain Garden 11,587 305,080 3.17 0.40 1,600

Totals

Total IC Disconnected (sq. ft.) Annual Gallons Treated Annual Nitrogen Reduction (lb. N/yr) Annual Phosphorous Reduction (lb. P/yr)
Total 121,530 3,200,019 33.98 4.24