Pennichuck Square
Pennichuck Water Works, NH
This project is a demonstration of innovative drainage improvements that will result in over 88% of the site's runoff being treated to remove pollutants that now enter Pennichuck Brook directly from the pavement.Pennichuck Water Works, NH
The project results from a state grant awarded to Pennichuck based on an application submitted jointly by Pennichuck and the Merrimack Planning Board. Funding is from Pennichuck Water Works and NH Department of Environmental Services (NH DES).
The project features a Low Impact Development (LID) approach, something that is catching on all over the U.S. in recent years. LID is an approach to development and redevelopment that considers the natural hydrology or water flow of any site, with the goal of replicating the site's original water balance as much as possible.
The techniques are designed to reduce flooding, prevent water pollution and recharge groundwater, all while being attractive and cost competitive with standard engineering techniques. They include new techniques such as biofilters, pocket raingardens and infiltration dividers in the parking lot that will trap rainwater runoff and infiltrate it for natural treatment through the soil and other biological filters built at the site. It also includes old but underused techniques like leaching catch basins and level spreaders.
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