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Contributors of Dr~inA~e Waters - All real properties <br />located within the City. <br /> <br />Detention - The collection and temporary storage of <br />stormwater with subsequent gradual release to surface <br />water conveyances at a controlled rate. <br /> <br />Developed - Any property altered in appearance by <br />removal of forty percent (40%) or more of its vegetation, <br />grading of the ground surface, or construction of a <br />structure or impervious surface, except bona fide <br />agricultural property in an Agricultural Zoning District. <br /> <br />Director - The Supervisor of the Stormwater and Lake <br />Management Utility appointed or designated by the Public <br />Works Director or the City Manager. <br /> <br />Equivalent Residential Unit (ERU) The average <br />impervious area in square feet for all residential dwelling <br />units in the City and the basic unit for the computation of <br />Stormwater and Lake Management Fees as established by <br />Resolution of the City Commission. <br /> <br />Fee - Stormwater and Lake Management Fees authorized <br />herein and set by Resolution of the City Commission. <br /> <br />Hydrologic Response - The manner and means by which <br />stormwater collects upon real property and is conveyed <br />from real property, and which is a function dependent <br />upon a number of interacting factors including, but not <br />limited to, topography, vegetation, surfacial geologic <br />conditions, antecedent soil moisture conditions and ground <br />water conditions. The principal measure of the hydrologic <br />system may be stated in terms of total runoff volume as a <br />percentage of total precipitation which runs off, or in <br />terms of the peak rate of flow generated in the event of a <br />storm of given duration and intensity, or statistical <br />interval of return (frequency). <br /> <br />Impervious Areas - Those hard-surfaced areas which <br />either prevent or retard the entry of water into the soil <br />mantle as it entered under natural conditions prior to <br />development, and/or cause water to run off from the <br />surface in greater quantities or at an increased rate of <br />flow from that present under natural conditions prior to <br />development. Common impervious surfaces include, but <br />are not limited to, rooftops, sidewalks, walkways, patio <br />areas, driveways, parking lots, storage areas, and other <br />surfaces which similarly impact the natural infiltration or <br />runoff patterns which existed prior to development. <br /> <br />4 <br /> <br /> <br />