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June 16, 2022 <br />100 <br /> <br /> Source: City of Moorhead, Minnesota. Rainfall Intensity-Durations Charts, developed by Houston <br />Engineering, 1985 <br /> <br />7. Consideration shall be given to the relationship of the subject property to the drainage <br />pattern of the watershed. <br />8. A concentrated discharge of stormwater to an adjacent property shall be within an existing <br />watercourse, legal drain, public right-of-way or enclosed in an easement. <br />(h) System Strategy. <br />1. Hydraulic Capacity shall be determined by the Manning Equation. The hydraulic capacity is <br />termed Q and is expressed as discharge in cubic feet per second: <br />Q = 1.486 AR 2 / 3 S 1/ 2 <br />n <br />where: <br />Q = The hydraulic capacity <br />A = Cross-sectional area of flow in square feet <br />N = Manning’s roughness coefficient <br />R = Hydraulic radius in feet (R = A/P, where P is equal to the Wetted Perimeter) <br />S = Slope of conduit in feet per foot <br />2. Minimum Slopes design grade for storm sewer systems shall be self- cleaning, based on <br />three (3) feet per second using the Manning Equation. Minimum grades for the reinforced <br />concrete pipe (RCP) shall be designed using Table 18 Minimum Grades.