Drainage_and_Flooding_Report-dated_10_03_2008

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Mr. Ron Bottoms, City Manager k I o t z a s s o c i a t e s October 1, 2008 Page 21 of 31 • Replacing an existing sewer pipe (or box culvert) with a larger pipe (or box) • Adding a new parallel sewer line near an existing pipe or culvert, the new line being of similar or larger size • Adding a diversion line which carries a portion of the total flow in an existing line to another location or outfall • Altering the slope or invert of existing sewer lines • Replacing existing manholes or junction boxes when in poor condition • Placing a new sewer line in an existing ditch with capacity similar to the ditch capacity • Placing a new sewer line along an existing ditch line and increasing the capacity of the original ditch with the new sewer line • Controlling the points of storm water entry into the sewer line more effectively • Altering the outfall configuration for the drainage system • Change the configuration of the inlet type or size to be used to one which has greater capture efficiency • Increase the size and/or number of inlets • Improve location of inlets so that runoff can be more effectively captured • Provide an overflow path to a ditch Note that proper and continuing maintenance of sewers, ditches and channels is an important requirement for maintaining design capacities. To reduce ponding of storm waters, provision of overland sheet flow paths to allow alternative ways to drain areas of ponding and excessive water accumulation can be provided. Provision of overland sheet flow paths have been discussed and proposed in Reports #1 and #2 as more immediate, short term remedies for some drainage problems because provision of sheet flow paths can be implemented rather quickly and often at relatively low cost. Provision of overland flow paths may not always be a comprehensive solution because if the outfall receiving point or water for the overland flow (e.g., a drainage channel) does not have sufficient capacity, then the overland flow path capacity may be reduced or even prevented from functioning. Thus overland flow path solutions