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klutzi rl associatess <br />FloodingProblems ................................................................................... <br />2-9 <br />2.4.1 <br />Sheet Flow Ponding and Paths .................................................... <br />2-9 <br />2.4.2 <br />Flow Path Elevation Adjustment ................................................. <br />2-10 <br />2.4.3 <br />Sewerage Improvements .................................... .... :z .... i ....... :4_.- <br />2-10 <br />2.4.4 <br />Channel Capacity Increase .......................................................... <br />2-11 <br />2.4.5 <br />Detention ..................................................................................... <br />2-12 <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 />3.2 Classification of Watercourses ................................................................ 3-3 <br />3. <br />3 Hydrologic Models... ............................................................................... 3-4 <br />3.3.1 HEC-HMS Hydrologic Models for Primary Channel <br />Drainage Areas ............................................................................ 34 <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 />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 />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 />4.1 Approach ................................................................................................. 4-1 <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 />4.2.3 Storm Sewer System Improvements ............................................ 4-7 <br />TOC-2 <br />Klotz Associates Project No. 0127.008.000 La Porte Citywide Drainage Study <br />January 2009 City of La Porte <br />