Anthony Drive Channel Restoration

Laconia, New Hampshire

The D&K water resource team conducted a detailed geomorphic, hydrologic, and hydraulic analysis of an aging storm drain system used to collect stormwater and route a natural stream around a 1950s residential development. The team identified opportunities in the upper watershed for natural flood reduction by maintaining existing wetlands, quantifying the insufficient hydraulic capacity of the existing storm drain system, and designing improvements, including 250-ft of new 60-inch concrete culvert pipe and replacement of 500-ft of pipe with a natural, open stream channel. Services include:

Coordination and meetings with City and State staff, regulators, and landowners
Fluvial geomorphic assessment using Vermont Protocols
Hydrologic analysis to estimate inflows to the storm drain system
Hydraulic analysis of the storm drain system using HydraFlow and the restored open stream channel using HEC-RAS
Natural stream channel design utilized log and stone habitat features
Storm drain design using tee-based manholes to maximize hydraulic capacity with relatively small pipes
Plans and specifications
Wetland, Shoreland, and Alteration of Terrain permits
Cost estimates
Bid and construction phase support