Client project details

Town of Newmarket, NH (Artificial Recharge)

The Project

The Town of Newmarket chose EGGI to investigate the potential to artificially recharge the Newmarket Plains Aquifer.  The plan was to increase groundwater storage in the aquifer and thus enhance withdrawals from the Town’s two Production Wells.  The study involved the installation of borings and monitoring wells, conducting percolation tests, and the assessment of geochemical testing carried out to determine the effectiveness of natural filtration of surface water through the local subsurface sand and gravel deposits.  This assessment was performed over a six-month period.

Lamprey River water was passed through two eight-foot columns of aquifer sand, in unsaturated and saturated conditions, with water quality monitored throughout.  Concentrations of dissolved organic carbon (a precursor to disinfection byproducts) were reduced by 40%. Similar rates of natural filtration of manganese and color, both common in river water, were also noted.  Numerical modeling of the aquifer was conducted to evaluate the water supply benefits of artificial recharge to the Town of Newmarket.

Status/Results:

The numerical model of the Newmarket Plains Aquifer indicates that the use of artificial recharge will result in a 70% increase in the productivity of the Town of Newmarket Production Wells.  Newmarket was granted an Artificial Recharge Permit by the State, and the Town Council has been very pleased with the outcome of this investigation.

As a direct result of the very favorable findings of this specific investigation, the State has promulgated new regulations and guidelines regarding Artificial Recharge projects in New Hampshire. 

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Newmarket was granted an Artificial Recharge Permit by the State, and the Town Council has been very pleased with the outcome of this investigation.

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P.O. Box 1578
56 Main Street
Meredith, NH 03253
T: (603) 279-4425
F: (603) 279-8717
eggi@eggi.com

“Data and research provide the underpinning for sound local water management decision-making that advances the well-being of the nation’s citizens, economy, and environment.”

- National Ground Water Association