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<br />k lot z 4~~ ass 0 cia t e s <br /> <br />4.2.3 Storm Sewerage System Improvements <br /> <br />When the source of the drainage problem for a particular area of identified significant <br />drainage problems is not considered to be channel flooding or a flood-related source, <br />storm sewer system improvements should be considered. Areas of drainage problems for <br />which inadequate storm sewerage was identified as the likely source of the drainage <br />problems were listed in Letter Report No.2. Sewerage improvements could involve <br />sewer pipe replacement (with larger size pipe), addition of supplemental sewer lines, <br />sewer pipe replacement with alternative materials, or, perhaps, sewer pipe lining. <br />Inadequate sewer inlet capacity, because of inlet size, number, or location, may also be a <br />root cause of inadequate sewerage. Letter Report No.2 noted potential deficiencies in <br />inlet spacing. Subdivision areas where conditions suggest that the underground sewers <br />systems and/or inlets may be inadequate are listed in Table 2-2. <br /> <br />The CWDS is intended to address surface drainage issues. Where deficiencies in <br />underground sewer systems or surface inlets are suspected, focused detailed study on <br />such areas will be required. This CWDS report does not specifically address remedy of <br />underground sewer system deficiencies. <br /> <br />One important factor in regard to the local drainage provided by storm sewer systems <br />needs to be borne in mind when addressing potential sewer system improvements. The <br />system of streets drained by a sewer system is in fact part of the sewer system. Limited <br />accumulation of storm waters in the streets for the events larger than the design storm <br />event C3-year storm for the City) is a planned behavior. Water accumulations at shallow <br />depths for larger storm events do not inherently imply that a sewer system is inadequate <br />or that there is a drainage problem to be remedied. However, if the City prefers to reduce <br />these areas of ponding, then improving the sewerage (e.g., adding additional inlets, <br />increasing the storm sewer pipe sizes, building a parallel line) would provide an <br />additional level of flood-protection. Detailed storm sewer analysis is beyond the scope of <br /> <br />4-7 <br /> <br />Klotz Associates Project No. 0127.008.000 <br />January 2009 <br /> <br />La Porte Citywide Drainage Study <br />City of La Porte <br />