Dolf Brook Watershed Hydrology Analysis & Culvert Replacement

Hopkinton, New Hampshire

Client: Town of Hopkinton, New Hampshire


  • Culvert Analysis and Design
  • Hydraulic Design
  • Hydrological Analysis
  • Permitting
  • Watershed Analysis

Project Summary

Dolf Brook is a tributary to the Contoocook River that crosses multiple Town roadways. The nearly 4,000 acre watershed includes multiple wetlands, forested hills, residential neighborhoods, ponds, two dams and Kimball Lake. Hoyle Tanner conducted the watershed analysis for the purpose of assessing peak flows from rainfall events in order to adequately size and design replacement culverts for the seven culverts that convey Dolf Brook under Town roadways. The first of the culvert designs and replacements was the Rollins Road culvert. The watershed analysis enabled the accurate prediction of peak flows due to rainfall events. Hoyle Tanner is coordinating its efforts with the Town and with the New Hampshire Department of Environmental Services (NHDES) in order to meet the requirements of the New Hampshire Stream Crossing Rules.

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