Mapping Stormwater Outfalls and Stream Crossings in the Lamprey River Watershed,
Jenn Rowden Nov. 2010 presentation to W&S Committee
Grant for $4200 was spent 50% on intern field research, 50% on Jen and Dawn’s salaries, and equipment.
Survey completed in 2010 focusing on 45 stormwater outfalls and 30 stream crossings in Epping, Newmarket, and parts of Raymond revealed that dozens of culverts go directly to the Lamprey. Over half were perched and most were partially blocked. Anecdotally, many road swales and outfalls near stream crossings were found that directed stormwater to the river. The study tried to find correlations between water quality data and outfalls/crossings, but such correlations were difficult and inconclusive. In Newmarket, researchers found significant issues at Moonlight Brook, despite lots of new construction. In Epping, the DOT Park & Ride lot was the worst section of the river, with oily residue and trash making their way to the river. It was clear that stormwater infrastructure was not being maintained. In Raymond, high E. coli counts were found in many areas.
Following the study, Raymond said it would work with the planning board to improve the culvert situation in town.