Isanti County Native Grass/ Stormwater BMP Demonstration Project
Project will focus on BMP's that reduce runoff and/or keep water on the land. The establishment of 8 native plantings on 153 acres using an approved 15 native species mix on marginal farm fields will significantly reduce runoff of sediments and nutrients, and act as a filter to remove nutrients and sediment from fields upslope. Based on RUSLE2 estimates, 336.6 tons/yr of soil will be saved, and 202 lbs/yr of phosphorus and 3,336 lbs/yr of nitrates will not runoff the fields and/or leach into the ground water. The sandy soils of the Anoka Sand Plain are susceptible to the leaching of nitrates into the aquifers. In addition, by converting farm fields to native plantings the use of pesticides will be significantly reduced. Stormwater management projects e.g. rain gardens, sediment basins, bridges, and permeable surfaces will address municipal concerns related to water quality by reducing runoff amount and nutrient loading by providing temporary storage of surface water to allow time for settling and uptake of nutrients and sediments. These projects will also address gully erosion in highly sensitive and heavily used park areas. Estimated total reductions from the 3 park projects are: 1.15 tons/yr of sediment and 5.44 lbs/yr of phosphorus.
(c) $3,000,000 the first year and $3,000,000 the second year are for nonpoint source pollution reduction and restoration grants to watershed districts, watershed management organizations, counties, and soil and water conservation districts for grants in addition to grants available under paragraphs (a) and (b) to keep water on the land and to protect, enhance, and restore water quality in lakes, rivers, and streams, and to protect groundwater and drinking water. The projects must be of long-lasting public benefit, include a local match, and be consistent with TMDL implementation plans or local water management plans. Up to five percent may be used for administering the grants (2011 - Clean Water Assistance)
Based on RUSLE2 estimates, 336.6 tons/yr of soil will be saved, and 202 lbs/yr of phosphorus and 3,336 lbs/yr of nitrates will not runoff the fields and/or leach into the ground water. Estimated total reductions from the 3 park projects are: 1.15 tons/yr of sediment and 5.44 lbs/yr of phosphorus.
The Isanti SWCD completed native grass plantings at 19 sites totaling 244.66 acres. Of these acres, 59 were at Springvale and Anderson County Parks. The remainder were on privately owned parcels. As a result of the installation of these conservation BMPs, there is a reduction of 120 tons of sediment entering the Rum River and a reduction of 25 tons of sediment entering the Sunrise River.