The purpose of the Road Management Plan is to address the declining water quality of Lovell Lake caused by runoff from Brackett and Pond Roads carrying sediment and phosphorus. Unimproved roads are commonplace in the Lakes Region of New Hampshire in an area with a substantial seasonal population. Unimproved roads and associated maintenance are well documented as major sources of sediment and phosphorus to surface water and may account for as much as 80% of the sediment load and 40% of the phosphorus load within a watershed. Studies have shown that during highly erosive storm events, sediment concentrations may be observed to exceed 100,000 mg/L with averages for gravel roads >3,000 mg/l (Clinton and Vose, 2003) whereas a typical low use paved road would be ~100 mg/L (Hagen and Walker 2006). The impacts from these sediment laden waters can be substantial and directly impact the value, aesthetics, and usability of our lakes. As seasonal populations grow and become permanent, the number of road miles and driveways will increase, and maintenance demands for these unimproved surfaces will increase.
Brackett Road property owners, the Brackett Road Association, AWWA, the Town of Wakefield, the UNH Stormwater Center, and the NHDES partnered to achieve these goals starting in 2012.
Project Work – 2012
In the fall of 2012, the Wakefield DPW began work on Brackett Road to prevent stormwater runoff from entering Lovell Lake and the adjacent streams. Work started at end of Brackett Road just before Pond Road begins, Site BR013. The road was sloped toward a Lovell Lake inlet stream and carrying large volumes of sediment to the stream during every rain event. The Wakefield DPW installed a 300 foot erosion stone trench leading to a deep sump catch basin. The catch basin then culverts water across the street to a large detention pond where the remaining stormwater is treated for sediment before infiltrating into the ground.
The next site the DPW attacked was Site BR009. This site sat at the base of two hills on Brackett Road and was conveying a large volume of runoff and sediment toward Lovell Lake. The crew followed the same protocol as with BR013. An armored ditch leading to a deep sump catch basin that conveys the remaining runoff to a large detention basin that slows, stores and infiltrates the runoff.