Capstone Project - Resource Management and Conservation Program - Environmental Studies - Antioch University New England

Sample Capstone Project

Build-out Analysis for the Upper Ashuelot River Watershed

The purpose of this study was to delineate and then model the water quality and quantity impacts of fully developing this southern New Hampshire river watershed as allowed by current zoning regulations. In addition, a sensitivity analysis was done on what the net reduction in impact would be if there were imposed specific zoning changes to limit development within sensitive areas.

Utilizing the tools of Geographic Information Systems in combination with developing a linked spreadsheet model, a projection of storm water run-off, soil loss and phosphorus loading was estimated for the current conditions and project for the build-out condition reflected by the zoning ordinances.

Results of this research and forecasting methodology projected a 225% increase in storm water run-off for a 24-hour 2 year storm event. Concurrently, this translated in an increase in soil loss of 75% and a comparable increase in phosphorus loading.

Recommendations developed from this analysis pointed to possible changes in zoning densities within specific environmentally sensitive zones within the watershed, the possibility of implementing a steep slope ordinance and establishing a 150’ riparian buffer around specific 2nd and 3rd order streams.

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