Stormwater Management

USHERS CREEK RESTORATION

HIAWATHA, IA

Grading and restoration of Ushers Creek, which was obstructed by significant amounts of sediment and debris.

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The creek drains approximately 250 acres of upstream land through the Heritage Green neighborhood. The creek filled with sediment and debris over the years, causing periodic flooding in the neighborhood. Hall & Hall used its topographic survey and historical aerial photos to restore 1,650 lineal feet of the creek in its pre-development location. Hall & Hall also obtained permanent drainage easements from land owners for future City maintenance.

Project Issues:
This project is located in a wetland. A wetland delineation was completed and Corps of Engineers permit was obtained. The Corps would not allow any fill, including rip rap, to be placed within the project limits. In lieu of traditional hard-armored erosion control, the design took a “soft” approach by considering channel curvature, side slopes, width and turf reinforcing materials to reduce the risk of recurring erosion. The surface was restored with native seeding. Public information was ongoing throughout design and construction, including individual and group meetings, and incorporating public input into the project whenever possible.

SEMINOLE RIVER BANK ARMORING

CEDAR RAPIDS, IA

Hall & Hall Engineers designed approximately 1600 lineal feet of embankment repairs along the Cedar River to stabilize heavily eroded areas threatening the City of Cedar Rapids raw water supply.

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Project Info:
Several areas along the Cedar River near Horizontal Collector Well #4 and Seminole Well #2 were eroding away and close to compromising the integrity of both City access road servicing those two wells and the raw water line connecting them to the City’s system. Hall & Hall worked to design erosion control measures to reduce the risk or further erosion in those two areas. Permits, archeological surveys, and potential wetland mitigation measures required close communication with the Iowa Department of Natural Resources. Additional communication was required to coordinate access to the construction site through the Seminole Valley Park and Museum entrance road.