The Grove Phase 3 Restoration – Two Stage Ditch
With Bloomington’s Stormwater funding, the city matched federal funding with the IDR’s State Wildlife Grant for habitat enhancement and NRCS’s Conservation Innovation Grant for nutrient management in agricultural runoff.
Figure 1 Sediment benches in drainage ditch and in the two stage drainage ditch with a larger excavated sediment bench. Bloomington selected the two stage ditch as the practice to be applied in Phase 3 of the Grove Restoration on the West Branch on the West Branch of Kickapoo Creek. The typical agricultural two stage ditch is widened at the elevations of sediment benches deposited in the bed of normal agricultural ditch (figure 1).
Figure 2- The drainage ditch was excavated to a wider ditch with a larger floodplain area, which was seeded with prairie grasses. The Grove two stage ditch practice was modified to include significant stormwater storage (36 acre ft.) in the prairie wetland complex adjacent to the ditch (figure 2).