City of Leavenworth, Kansas

2017

Water Resources Solutions developed construction plans and specifications for a stormwater design on Ottawa from 7th Street to Broadway in Leavenworth, Kansas. The plans were based on the watershed study of the basin completed by WRS that identified four alternative solutions for the design.

The proposed phased improvements included replacing approximately 430 linear feet of stormwater pipe, 950 square yards of streambank stabilization and re-vegetation, 1100 square yards of asphalt pavement, and 460 linear feet of curb and gutter.

In order to meet water quality improvement goals, WRS looked at an alternative to the traditional curb and gutter inlet. As a result, the project included eight bioretention inlets and 750 square yards of bioswale. The project also included 960 Square yards of riparian restoration.

The water quality inlets are designed to function as curb inlets from the streets. Once the runoff enters the inlets it is allowed to infiltrate into the soil media for treatment. For larger storms, a dome grate inlet passes the excess flow into the storm pipe system that then ties into the main system. The water quality inlets are essentially very small-scale detention basins.