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TPBr E 1 TABLE 3 <br />NUTRIENT LOADING ACCORDING TO LAND USE SOILS AND SLOPE DESCRIPTIONS <br />�a <br />Land Ute <br />Open Space <br />Residential: <br />lots larger than 1 acre <br />lots 1 acre or less <br />multiple dwellings <br />I <br />Commercial/Industrial <br />Nutrient Load Tight Soil <br />(pounds/acre/year) <br />0.30 <br />Medium Soil <br />0.40 <br />1.44 <br />3.46 Loose Soil <br />A mixture of clay with sand, silt or clay, <br />0.2 to 0.6"/hr. permeability. Example: <br />Brickton silt loam. <br />A glacial till, loams, sandy silts or clays, <br />0.6 to 6"/hr, permeability. Example: Nessel <br />sandy loam. <br />Clean =.nds and gravels, greater than 6" /hr. <br />permeability. Example: <br />Zimmerman fine sand. <br />Steep Slope 6% or more; „ 1, <br />TABLE 2 <br />NUTRIENT ASSIMILATIVE CAPACITY OF WETLANDS Moderate <br />Slope 2% to 6% <br />Assimilative Capacity <br />Wetland Type (pounds/acre/year) Flat S'ope 2% or less <br />Cattail Marsh (continuously wet) 4.0 <br />Grassy Marsh (alternately wet -dry) 12.0 '. <br />TABLE 4 - RUNOFF COEFFICIENTS (C) <br />Land Use <br />t <br />Non - <br />Residential <br />Residential <br />Open <br />Space <br />Single Family Detached & Dupl,. Multiple Dwelling <br />Commercial <br />Greater than <br />1.2 acre <br />- <br />16-1 acre <br />less than <br />10 units/acre <br />More <br />Soil and Slope <br />Industrial <br />Characteristics <br />2 acre lots <br />lots <br />lots <br />1h acre iots <br />or less <br />than 10 <br />unitslacre <br />Steep Slope <br />0.65 <br />0.65 <br />0.70 <br />0.70 <br />0.70 <br />0.75 <br />0.85 <br />^ 10 <br />Tight Soil <br />Steep Slope ' , <br />0.40 <br />0.45 <br />0.45 <br />.050 <br />0.50 <br />0.60 - <br />0.75 <br />0.85 <br />Medium Soil <br />Steep Slope <br />0.30 <br />0.30 <br />0.35 <br />0.1_ <br />0A0 <br />0.50 <br />0.70 <br />0 80 <br />Loose Soil <br />Moderate Slope <br />0.50 <br />0.50 <br />0.55 <br />0.60 <br />0.60 <br />0.65 <br />0.80 <br />0.85 <br />Tight Soil <br />Moderate Slope <br />0.35 <br />0.40 <br />0.40 <br />045 <br />0.45 <br />0.60 <br />0.70 <br />0.80 <br />Medium Soil <br />Moderate Slope <br />0.20 <br />0.25 <br />025 <br />0.30 <br />0 35 <br />045 <br />0 L: <br />0 75 <br />Loose Soil <br />Flat Slope <br />0.4� <br />0 45 <br />0 50 <br />n50 <br />0�55 <br />0 65 <br />0 75 <br />0.80 . <br />Tight Soil <br />Flat Slope <br />0.30 <br />n 3 <br />035 <br />040 <br />0.45 <br />0.55 <br />0 70 <br />0 75 <br />Medium Soil <br />Flat Slope <br />0.15 <br />0.20- <br />U 2 ' <br />I0.?5 <br />0.30 <br />0.45- <br />0 f,c?` <br />0 110 <br />Loose Soil <br />-- <br />__11._ <br />---- <br />Rice Creek Watershed District <br />�inistrative Office <br />177 • Arden Plaza <br />Lexington Ave. North <br />Arden Hills. MN 55112 <br />(612) 483 0634 <br />E A. Hickok & Associates Frank J Murray <br />Consulting Engineers Attorney <br />(612) 473 4224 (612) 222 5`.43 <br />