Water Supply Planning — New Britain, Connecticut

The City of New Britain's Water Department supplies water to more than 75,000 people living in New Britain, Farmington, Plainville, Berlin, Newington and Bristol. New Britain retained LEI to update its comprehensive 50-year water supply plan.

New Britain utilizes six surface water reservoirs, two wellfields, one surface water diversion and an interconnection with the Hartford MDC as its sources of supply. LEI conducted new bathymetric mapping and calculated current stage vs. storage and stage vs. area curves for each reservoir.

New safe yield pumping tests were conducted at the Upper and Lower White Bridge wellfields — concurrent with pumping the White Bridge pond station — to estimate the current safe yield of the wells. Pump test data were entered into a three-dimensional groundwater model which was used to predict total wellfield yield during both average and drought recharge conditions.

LEI also conducted pipeline flow measurements and Hazen-Williams "C" factor testing on raw water transmission mains to determine their hydraulic capacities. The data were entered into a custom-designed model to calculate the 1:100 year drought safe yield for the existing sources of supply. This model also analyzed the anticipated safe yield increase that would result from various source improvements.

The Water Supply Plan also contained population and water demand projections through 2050, short- and long-term improvement programs, and Water Conservation and Emergency Contingency plans.