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<br />e <br /> <br />e <br /> <br />e <br /> <br />DRAINAGE CRITERIA MANUAL (V. 2) <br /> <br />HYDRAULIC STRUCTURES <br /> <br />HYDRAULIC STRUCTURES <br /> <br />CONTENTS <br /> <br />Section Page <br /> <br />1.0 USE OF STRUCTURES IN DRAINAGE....................................................................................HS-1 <br /> <br />1.1 Introduction ................................. ...............................................,.................................. HS-1 <br />1.2 Channels Used for Boating ...........................................................................................HS-2 <br />1.3 Channel Grade Control Structures................................................................................ HS-3 <br />1.4 Wetland Channel Grade Control................................................................................... HS-3 <br />1.5 Conduit Outlet Structures,............................................................................................. HS-3 <br />1.6 Bridges.... .............................. ..................... ............... ............................. .... ...... ...... ....... HS-3 <br />1.7 Transitions and Constrictions........................................................................................ HS-4 <br />1.8 Bends and Confluences .......................,........................................................................ HS-4 <br />1.9 Rundowns ......... ..... .................... .....,............... ...... ............................. .......... ................. HS-4 <br />1.10 Energy Dissipation ....................................., .................................................................. HS-4 <br />1.11 Maintenance....... .........,.... ...................... .................... .............. ........... .......................... HS-5 <br />1.12 Structure Safety and Aesthetics.................................................................................... HS-5 <br /> <br />2.0 <br /> <br />CHANNEL GRADE CONTROL STRUCTURES (CHECK AND DROP <br /> <br />STRUCTURES) ..................,....... .......................... .......... ......... .............. .... ..... ........................... HS-6 <br />2.1 Planning for the Future.......................................,.......................................................... HS-6 <br />2.1.1 Outline of Section ............................,................................................................ HS-7 <br />2.1.2 Boatable Channels,...............................,.,..,..,.................................................. HS-8 <br />2.1.3 Grass and Wetland Channels ...........................,.............................................. HS-8 <br />2.1.4 Basic Approach to Drop Structure Design ....................................................... HS-8 <br />2.2 Drop Selection ..,......................... ...,....... ...... .... .............. .......... ................ ..... ............... HS-1 0 <br />2.3 Detailed Hydraulic Analysis ...............................................,........................................ HS-1 0 <br />2.3.1 Introduction......... ...................... ............... ..... ..................,..... ..................... .... HS-1 0 <br />2.3.2 Crest and Upstream Hydraulics .....,............................................................... HS-11 <br />2.3.3 Water Surface Profile Downstream of the Crest............................................HS-11 <br />2.3.4 Hydraulic Jump Location................................................................................ HS-13 <br />2.3.5 Jump and Basin Length ................................................................................. HS-15 <br />2.3.6 Seepage Analysis .......................................................................................... HS-15 <br />2.3.7 Force Analysis................... ........... .... ............................ ..... ....... ........... ..... ...... HS-15 <br />2.3.7.1 Shear Stress ................................................................................... HS-16 <br />2.3.7.2 Overall Analysis .............................................................................. HS-16 <br />2.3.7.3 Impact and Drag Forces ................................................................. HS-16 <br />2.3.7.4 Turning Force ................................................................................. HS-17 <br />2.3.7.5 Friction....................... .............. .................. ...... .......... .... ....... .......... HS-17 <br />2.3.7.6 Frost Heave........ ............ .......... .... ...... ............ ...... ........... ..... .......... HS-17 <br />2.3.7.7 Seepage Uplift Pressure........................................,........................ HS-17 <br />2.3.7.8 Dynamic Pressure Fluctuations ..................,.,................................. HS-17 <br />2.3.7.9 Overall Analysis .............................................................................. HS-19 <br />2.4 Simplified Designs for District's Grass-Lined Channel Drops.....................................HS-19 <br />2.4.1 Introduction and Precautions ......................................................................... HS-19 <br />2.4.2 Guidelines for Standard Grass-lined Channel Drops..................................... HS-19 <br />2.4.3 Grouted Sloping Boulder Drops ..................................................................... HS-20 <br />2.4.4 Vertical Hard Basin Drops.........................,.................................................... HS-25 <br />2.5 Baffle Chute Drops,..... ....................................... .................. .............. ........ ..... ...... ...... HS-29 <br />2.6 Seepage Control.......... ......................... ....., .......................................... .... ............. ...., HS-33 <br />2.6.1 Seepage Analysis Methods ........................................................................... HS-33 <br /> <br />06/2001 <br />Urban Drainage & Flood Control District <br /> <br />HS-i <br />