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ORDINANCE N0. 91-38 <br />URBAN SOIL SEDIMENT POLLUTION AND STREAM CHANNEL EROSION CONTROL <br />INTRODUCTION: <br />The prevention of accelerated flooding and stream channel erosion <br />in conjunction with urban development requires control of the <br />discharge rate and volume of runoff prior to its release to off- <br />site land. The purpose of Chapter 1127 is to: <br />Permit development without increasing the flooding of other <br />lands. Provide a basis for design of storm drainage systems <br />on lands above or below undeveloped areas which will preserve <br />the rights and options of both contributing and receiving <br />property owners and assure the long-term adequacy of storm <br />drainage systems. <br />Accelerated channel erosion as well as increased flood damage could <br />be controlled if the predevelopment hydrograph could be maintained. <br />It is usually not practical,, however, to retain the predevelopment <br />rate of infiltration when a large part of the watershed is covered <br />with impervious surfaces. The concept of reducing peak flows below <br />those of predevelopment storms was developed as an alternative to <br />maintaining the predevelopment hydrograph. The, logic of this <br />concept is to compensate for the increased erosiveness of: <br />1) Increased volume of runoff due to less infiltration. <br />1