A ten-year watershed restoration program was created by Pennichuck Water Works, Inc. following the completion of the 1998 Watershed Management Plan and implementation program. The implementation of the Watershed Management Plan was highly successful, occurring from 1998 to 2007; however, the effectiveness was not quantified due to a lack of monitoring and other data. The purpose of this 10-year watershed restoration program was to provide that quantification.
The 10-year program was developed over a two-year period from 2006 to the end of 2007. During that time, considerable water quality and flow data was collected throughout the watershed for both dry and wet weather precipitation events. Based on that data and other available historical data, Pennichuck evaluated flows and pollutant loads throughout the watershed. Pennichuck’s consultant, Comprehensive Environmental Inc. (CEI), used the data to develop and calibrate the model that mimics flow and quality of Pennichuck Brook at various locations throughout the watershed. The model was calibrated such that ‘what if’ scenarios could then be evaluated as to how to meet water quality goals.
Pennichuck initiated a strategic plan to expand public education and communication outreach programs and other non-structural opportunities to protect the watershed. As a result, Pennichuck initiated an update to its 2008 Pennichuck Brook Watershed Restoration Plan, which was completed in 2012. The 2012 Plan restructures the recommendations to incorporate the expanded public and communication outreach programs, outline other water quality benefits such as sediment removal and increased infiltration, and incorporates long-term operating costs.