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<br />k lot z G~[" ass 0 cia t e s <br /> <br />2.3.4 Problem Areas with Short Term Drainage Project Remedy........ 2-8 <br /> <br />2.4 <br /> <br />Probable Causes and Potential Remedy of Drainage and <br /> <br />Flooding Problems.. ................. ................................ .................. .............. <br /> <br />2.4.1 Sheet Flow Ponding and Paths .................................................... <br />2.4.2 . Flow Path Elevation Adjustrnent................................................. <br />2.4.3 Sewerage Improvements.............................................................. <br />2.4.4 Channel Capacity Increase ................................ ........... ............... <br /> <br />2.4.5 Detention.. ................................................................................... <br /> <br />2-9 <br />2-9 <br />2-10 <br />2-10 <br />2-11 <br />2-12 <br /> <br />SECTION 3 METHODS FOR EVALUATION OF ALTERNATIVE REMEDIES <br /> <br />3.1 Purpose and Scope of Evaluation ............................. ............................... 3-1 <br />3.1.1 Drainage Criteria ............................................ ............... .............. 3-1 <br />3.1.1.1 Design Frequencies....................................................... 3-1 <br />3.1.1.2 Detention Requirements .................... ........................... 3-2 <br />3.1.1.3 Street Ponding Levels.. .............. .................. ........ ......... 3- 3 <br /> <br />3.2 Classification of Watercourses.................. ................... ..................... ...... 3 - 3 <br /> <br />3.3 Hydrologic Models............................... ................................................... 3-4 <br />3.3.1 HEC-HMS Hydrologic Models for Primary Channel <br /> <br />Drainage Areas... ......... ............... .............. ..... ............... ............... 3-4 <br /> <br />3.3.2 Hydrologic Models for HEC-HMS Sub-Areas ........................... 3-4 <br />3.3.3 Correlation Models..................................................... ................. 3-5 <br />3.3.4 Hydrograph for Correlation Models ............................................ 3-5 <br /> <br />3.4 Hydraulic Models. ................................................................................... 3-6 <br />3.4.1 FEMA Hydraulic Models ............................................................ 3-6 <br />3.4.2 Non- FEMA -Modeled Channels.................... .............................. 3-7 <br /> <br />3.5 Evaluation of Storage Requirement........... ..... .......... .............. .......... ....... 3-7 <br />3.5.1 Mitigation Storage for Channel Widening .................................. 3-7 <br />3.5.2 Diversion Storage............ .......................... .......... ........................ 3-8 <br />3.5.3 Mitigation of Excess Runoff Due to Development ..................... 3-8 <br />3.5.4 Correlation Models ...... ............. ................................................... 3-8 <br /> <br />SECTION 4 IDENTIFIED DRAINAGE AND FLOOD CONTROL REMEDIES <br /> <br />4.1 Approach ..... ............... ............................................................................. 4-1 <br /> <br />4.2 Identified Types of Remedies for Existing Conditions ........................... 4-1 <br />4.2.1 Remedies for Insufficient Channel Capacity............................... 4-1 <br />4.2.2 Mitigation of Channel Improvement ........................................... 4-6 <br /> <br />TOC-2 <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 />