This project will layer hydrologic, hydraulic, geomorphic, and pollutant loading analysis with existing countywide PTMApp outputs to identify the four highest priority areas for BMP implementation in an eastern Nicollet County ravine system experiencing dramatic mass wasting events. Three alternatives for each priority site will be presented, including an evaluation of water quality benefit, construction costs, and a cost-benefit summary.
The purpose of this project is to complete Intensive Hydraulic Conditioning on the remaining 60% of the watershed to be able to utilize the Prioritize, Target, and Measure application (PTMApp). The basin has 1.1 million acres of drainage with approximately 630,000 acres remaining to be hydro conditioned. With the advancement in targeting pollution sources within the watershed and state, the partners intend to be able to more accurately target conservation practices with the hydraulic conditioning completed.
The Greater Blue Earth River Basin Alliance (GBERBA) along with Soil and Water Conservation Districts, Counties, landowners, and drainage authorities in the ten member counties will install conservation drainage practices to improve water quality. 103E drainage systems with documented sediment or water quality issues are the focus with the goal of installing 52 practices such as improved side inlets (grade stabilization structures), alternative tile inlets, denitrifying bioreactors, saturated buffers, storage wetlands and others.