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<br />Many of the structural activities relating to urban drainage and <br /> <br /> <br />flood control (UDFC) constitute a ~~viee provided to improve living <br /> <br /> <br />conditions in urban areas. As a service, it provides three types of <br /> <br /> <br />needs: (I) the need for flood damage mitigation and protection; (2) the <br /> <br /> <br />need for rapid drainage of public facilities for the basic purpose of <br /> <br /> <br />convenience; and (3) the need for environmental management such as <br /> <br /> <br />cleansing of streets and washing away collected dust and pollutants. <br /> <br /> <br />Remedial structural drainage and flood control activities require <br /> <br /> <br />an assessment of the benefits derived by those being relieved of poten- <br /> <br /> <br />tial flood damages. In many situations, urban storm drainage needs <br /> <br /> <br />become urgent because of the advancing urbanization of an area. Some- <br /> <br /> <br />times the direct beneficiaries are those who are relieved of potential <br /> <br /> <br />flood damages while, at the same time, urbanization is the culprit. <br /> <br /> <br />The service concept recognizes the fact that a drainage system accommo- <br /> <br /> <br />dates additional stormwater generated by urbanization. The service <br /> <br /> <br />concept is important in the identification of the full range of drainage <br /> <br /> <br />and flood control benefits and beneficiaries, <br /> <br /> <br />Multi-purpose use of urban drainage and flood control projects <br /> <br /> <br />often provides additional benefits. For example, effective regulation <br /> <br /> <br />of flood plains encourages compatible uses such as parks, recreation areas <br /> <br /> <br />and farming, providing open space in urban areas, Flood plain regulation <br /> <br /> <br />does not prevent flood plain development, but encourages wise use. <br /> <br /> <br />Streams and gulches traversing urban areas can be developed by the public <br /> <br /> <br />to not only carry flood waters, but to provide recreational facilities <br /> <br /> <br />and transportation corridors as well. Other multi-purpose considerations <br /> <br /> <br />include pollution control, reduction of traffic disruption, access <br /> <br /> <br />control for emergency vehicles, and erosion reduction. <br /> <br />10 <br /> <br />. <br />