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<br />k lot z 4~~ ass 0 cia t e s <br /> <br />SECTION 3 <br /> <br />METHODS FOR EVALUATION OF ALTERNATIVE REMEDIES <br /> <br />3.1 Purpose and Scope of Evaluation <br /> <br />Various methods are used to determine the characteristics of various remedies, i.e., <br />potential solutions, proposed to address identified drainage and flooding problems. The <br />previous section identified problem areas; the following section applies the methods of <br />this section to size, dimension or otherwise define the key features of proposed remedies. <br /> <br />Basic characteristics of remedies to be determined include channel geometries and <br />detention pond sizes. The information required to determine these characteristics are <br />storm water runoff and channel flow depth, i.e., hydrologic and hydraulic behavior. <br /> <br />3.1.1 Drainage Criteria <br /> <br />Characteristics of remedies are determined in light of City drainage criteria. Key <br />drainage criteria from the City of La Porte Design Criteria Manual, Chapter 5 used in the <br />development of drainage and flooding problem remedies are the following: <br /> <br />3.1.1.1 Design Frequencies <br /> <br />Design frequencies, expressed as return period, for various infrastructure elements are the <br />following: <br /> <br />Sewers: <br /> <br />3-year <br />3-year <br />25-year <br />I DO-year <br />I DO-year <br /> <br />Road side ditches and Culverts: <br />Ditches and Culverts draining more than 100 acres: <br />Bridges: <br />Creeks: <br /> <br />3-1 <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 />