Stormwater Best Management Practices

Stormwater Best Management Practices - Webster City, Iowa

Webster City, Iowa

Challenge

Two stormwater mains providing surface drainage for approximately 32 acres of commercial and residential properties discharged untreated stormwater directly into the Boone River below Riverside Park in Webster City, Iowa. Riverside Park is the start of one of the state’s first water trails and is upstream of the start of the state’s first ever PWA (Protected Water Area). In order to maintain the integrity of this section of the Boone River, the city of Webster City looked into creative options to treat this stormwater.

Solution

EarthView Environmental, now a part of Impact 7G, led the design team, completed the soils and hydrology study, developed the stormwater management plan, met with funding agencies, assisted the
lead engineer with construction drawings/specifications, and provided periodic construction inspections. Public presentations were made to state professional groups, and local groups. The Riverside Park Stormwater Wetland (RPSW) is a 2.5 acre extended detention stormwater wetland complex. The existing storm sewer main was converted into a constructed wetland. Stormwater filters though the wetland, infiltrates into the soil, and percolates to the ground water before reaching into the Boone River. It decreases flooding and provides water quality benefits including sediment removal, reductions in temperature (cooling) and removal of other pollutants. In addition, the system serves as a natural space functioning as a wet prairie offering a way for residents to interact with nature.

Project Outcomes

  • Helps to mitigate effects of flooding by slowing the movement of stormwater during rain events
  • Provides water quality benefits including: sediment removal, reductions in temperature (cooling) and removal of other pollutants.
  • Serves as a natural space functioning as a wet prairie offering a way for residents to interact with nature
Stormwater Best Management Practices - Webster City, Iowa
Stormwater Best Management Practices - Webster City, Iowa
Stormwater Best Management Practices - Webster City, Iowa
Stormwater Best Management Practices - Webster City, Iowa

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