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<br />0012G2 <br /> <br />5 <br /> <br />feel this division creates logical drainage units for planning and <br />management at the local level. The division separates the overall <br />basin planning process from the detailed subbasin planning process, <br />yet provides for coordination between these planning efforts. The <br />major basins are studied to plan central drainage and flood control <br />facilities, such as major channels and retention ponds. The individ- <br />ual subbasins are then studied to plan the trunk drainage facilities <br />(minimum size of 36" to 54" pipe or channel equivalent) from the major <br />channel to the upper reaches of the subbasin. Each property within <br />the community is overlain by at least one basin and one subbasin and <br />subject to the requirements of each. <br />2) Drainage and flood control - Control of surface and <br />subsurface stormwater runoff. In this paper, the writers will use <br />"drainage" or "flood control" alone to mean the same thing. The <br />writers are not referring to drainage of marshy lands for reclamation <br />purposes, nor to the hydraulic flow processes per se. <br />3) Drainage and flood control management program - A management <br />program enforced under some regulatory scheme for the equitable financ~ <br />ing of drainage and flood control facilities. The system consists of: <br />a) a Technical element which establishes the method to be <br />used for calculating flood hydrology, and <br />b) a Financial element which establishes the method to be <br />used for calculating the costs of urban drainage and flood <br />control facilities, and for allocating those costs among <br />the beneficiaries of the facility. <br />4) 'Medium-size community - Throughout this paper, the writers <br />are addressing drainage management for small to medium-sized rapidly <br />growing communities with populations under 200,000 persons. <br />