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2. Drainage Area and Raingarden size <br />Per email dated April 30th, 2021 from Jeremy Gumke, Public Works Superintendent at St. Anthony Village, <br />the drainage area adjacent to the culvert at Trillium Park, is approximately 0.10 acres. <br />There are 43,560 square feet in an acre. Therefore, 0.10 acre will be 4,356 square feet of drainage will be <br />used to calculate the size of our raingarden. <br />The percolation test indicated that our soil could infiltrate 24 or more inches in a day (1/2 inch per minute <br />of infiltration, see percolation test result). In that case our raingarden size can be 181.5 square feet or <br />less. We based our raingarden size (16 ft wide and 10 ft long) on the location of the hill and existing <br />shrubbery at Trillium Park. <br />Calculation: 4,356 𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠24 π‘–π‘–π‘–π‘–π‘–π‘–β„Žπ‘’π‘’π‘ π‘ =181.5 𝑠𝑠𝑠𝑠𝑠𝑠𝑠𝑠 <br /> <br /> An area calculation was made for our β€˜bean-shaped” 16 x 10 ft raingarden. In conclusion our <br />raingarden area will be approximately 135 square feet. <br /> <br />3. Soil Assessment <br />3.1 Percolation Test: <br />The percolation test was carried out twice, on May 5th and May 6th, 2021. On the first day a hole was dug <br />12 inches deep and 8 inches wide. After that it was fully filled up with water for a proper saturation. <br /> <br /> <br /> <br /> <br /> <br />Initial saturation