GILFORD — Engineers have recommended collecting water at the intersection of Cat Path and Henderson Road and directing it through a series of catch basins and a 15-foot pipe to an unnamed tributary of the Gunstock River.
The plan, which will need to be approved by the N.H. Department of Environmental Services, will be reviewed by the Conservation Commission on Tuesday at 7 p.m. during its regular meeting.
"We're very concerned about the water build up and now we're going to do something about it," said Town Administrator Scott Dunn.
If the proposal is approved by the state, Dunn said he expects the work to be done in 2014 and as part of the road maintenance budget line in the Department of Public Works. He estimates it will cost around $50,000.
The proposal said the town was faced with three options for the area: do nothing, treat the additional collected storm water from Henderson Road and convey it through a closed-pipe system to a 145-foot vegetated swale, or to construct the above catch basins and pipes.
Unable to secure an easement from the property owner of the proposed swale, the town chose the catch basins and a the 15-foot pipe with outflow to an unnamed Gunstock River tributary. The town expects it will have no effect on Gunstock River.
The collected storm water will be treated runoff because it runs up-grade into heavily wooded area of the 13-acre watershed. It is not anticipated the runoff will increase the temperature of the river, it is not anticipated the runoff will flood the river, and it not expected to erode the discharge area because rip rap will be installed to reduce discharge flow.
Once the Conservation Commission has reviewed the application, it will be forwarded to the DES for approval.
In other Gunstock River news, commission member Everett McLaughlin said the State removed many of the trees that had fallen along the river in a nearby section of Intervale Road.
The part of the Gunstock River that crosses Intervale Road has eroded and has seen excessive turbidity according to a Belknap County Conservation District study done released this spring.
He said the state left the stumps and the Conservation District has applied for grants to help reduce the amount of silt that flows into Saunders Bay from that area of the Gunstock River.