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Stormwater Narrative/Summary December 5, 2021 <br />Tanager Creek <br />Orono, MN <br />4 | P a g e <br />filtration basin. Per watershed rules, a filtration basin is required to retain twice the volume required for <br />infiltration. <br />The project has a increased impervious surface area of 14,487 square feet, which requires 1,207 cubic <br />feet of volume retention. The proposed filtration basin provides 2,498 cubic feet of retention, more than <br />twice the volume required for infiltration. <br />Summary <br />The implementation of a filtration basin will provide the necessary stormwater control to meet MCWD <br />regulations.