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<br />c. Channels <br />An open ditch conveyance network constructed within permanent <br />easements for the purposes of transporting storm run-off. <br /> <br />3. Storm Sewer Lateral Facilities <br />A network of pipes ranging in size generally from 12 inches to 27 <br />inches designed to collect storm run-off from a specified small <br />area to a trunk facility. The lateral facilities also include <br />street overland flow and inlet structures such as catch basins. <br />manholes and flared end sections. <br /> <br />B. Determining Storm Sewer Assessment Rates <br /> <br />1. Storm Sewer Trunk Rates <br />a. Design and estimate the total improvement cost of of the <br />ultimate trunk system needed to provide complete service to <br />each property in the Service District considered. Also. <br />include the total cost of any existing facilities and/or <br />previous storm sewer assessments to be credited. <br /> <br />b. Determine the base assessment rate by dividing the ultimate <br />system cost described above by the sum total of the following: <br /> <br />1. Gross area of low density residential properties times <br />1.0. <br /> <br />2. Gross area of medium and high density residential. <br />church and school properties times 1.25. <br /> <br />3. Gross area of commercial property times 1.5 <br />4. Gross area of industrial property times 2.0 <br /> <br />16 <br />