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<br />TABLE OF CONTENTS <br /> <br />DRAINAGE CRITERIA MANUAL (V. 2) <br /> <br />2.8 <br /> <br />Construction Concerns: Grass-Lined Channels ........................................................ HS-37 <br />2.8.1 Foundation/Seepage Control......................................................................... HS-37 <br />2.8.2 Baffle Chute Construction.............................................................................. HS-38 <br />2.8.3 Vertical Hard Basin Construction................................................................... HS-38 <br />2.8.4 Sloping Grouted Boulder Construction .......................................................... HS-38 <br />Low-Flow Check and Wetland Structures .................................................................. HS-39 <br /> <br />2.9 <br /> <br />3.0 CONDUIT OUTLET STRUCTURES ....................................................................................... HS-61 <br /> <br />3.1 General. ............. ..... .......... ...... ....................... ....... ........ .... ....... ........... .... ............ ........ HS-61 <br />3.2 Impact Stilling Basin ....................,.............................................................................. HS-61 <br />3.2.1 Low-flow Modifications..... .... ...... ..... ..... ......... ,....... ........... ................. ......... .... HS-62 <br />3.2.2 Multiple Conduit Installations......................................................................... HS-63 <br />3.2.3 General Design Procedure ............................................................................ HS-63 <br />3.3 Pipe Outlet to Baffle Chute ...............................,.....................................................,... HS-64 <br />3.4 Low Tailwater Basins.................................................................................................. HS-65 <br /> <br />3.4.1 General............. ..... ........,.. .... ..... ........................ .... ........... ....... .............. ........ HS-65 <br />3.4.2 Objective.. ,.,...... ..... ...... '" ...... .... ..... ...... ......... ..... .... .................. .............. ..... ... HS-65 <br />3.4.3 Low Tailwater Basin Design .......................................................................... HS-65 <br />3.4.3.1 Finding Flow Depth and Velocity of Storm Sewer <br />Pipe Outlets .................................................................................. HS-65 <br />3.4.3.2 Riprap Size ................................................................................... HS-67 <br />3.4.3.3 Basin Length ................................................................................. HS-68 <br />3.4.3.4 Basin Width. ........... ...... ........ ..... .... ........... ........... ........... ..... .......... HS-69 <br />3.4.3.5 Other Design Requirements .............................................,..................69 <br />3.5 Culvert Outlets ............................................................................................................ HS-69 <br /> <br />BRIDGES ..... ......... ..... ,.. ..... ..... ...... ..... .... ........... ,... ....... ..... .... ..... ..... ..... ........... .... ....... ......... ..... HS-80 <br />4.1 Basic Criteria ............. ...... ..... .............. ..... .................... ......... ............. ...... ..... ......... ..... HS-81 <br />4.1.1 Design Approach ........................................................................................... HS-81 <br />4.1.2 Bridge Opening Freeboard ............................................................................ HS-81 <br />4.2 Hydraulic Analysis ...................................................................................................... HS-81 <br />4.2.1 Expression for Backwater .............................................................................. HS-82 <br />4.2.2 Backwater Coefficient.................... .............. ..... ........... ........... ...., .................. HS-83 <br />4.2.3 Effect of M and Abutment Shape (Base Curves) .......................................... HS-84 <br />4.2.4 Effect of Piers (Normal Crossings) ..........................................,..................... HS-84 <br />4.3 Design Procedure........ ................. .... ...... .......... ........ ........... ........... ...... ..... ...... ........... HS-85 <br />4.4 Inadequate Openings ................................................................................................. HS-86 <br /> <br />5.0 TRANSITIONS AND CONSTRICTIONS ................................................................................. HS-90 <br /> <br />5.1 Introduction. ......................... ......... ............... ...... .... .... ........... ...... ..... ........... ......... ....... HS-90 <br />5.2 Transition Analysis..... ..... ...... .... ............ .... .... ..... ..... ................ .......... .......... ................ HS-90 <br />5.2.1 Subcritical Transitions.................................................................................... HS-90 <br />5.2.2 Supercritical Transition Analysis.....................................................,..,........... HS-91 <br />5.3 Constriction Analysis .................................................................................,................ HS-91 <br />5.3.1 Constrictions With Upstream Subcritical Flow............................................... HS-91 <br />5.3.2 Constrictions With Upstream Supercritical Flow........................................... HS-92 <br /> <br />4.0 <br /> <br />6.0 <br /> <br />7.0 <br /> <br />BENDS AND CONFLUENCES......... ................. ........... ....... ....... ..... ..... .... ..... ............ ......... ..... HS-94 <br /> <br />6.1 Introduction... .............................. ........................................... ...... ...... ..... .................... HS-94 <br />6.2 Bends. ......................... ....,..... .... ................. .... ,.......... ..... ..... ..... .... ....... .................... .... HS-94 <br />6.2.1 Subcritical Bends ............................................................,.............................. HS-94 <br />6.2.2 Supercritical Bends.... ......... ............ ..... ............. .... .......... ....... ...... ....' ........ ..... HS-94 <br /> <br />6.3 Confiuences........ .................... ..... .... .............................. .... .......... ....... ...... .............. .... HS-95 <br />6.3.1 Subcritical Fiow Confluence Design .............................................................. HS-96 <br /> <br />RUNDOWNS ................................................ ................................ ....... ............. ..... .................. HS-99 <br /> <br />TOC-ii <br />Urban Drainage and Flood Control District <br /> <br />6/2001 <br /> <br />e <br /> <br />e <br /> <br />e <br />