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<br />DRAINAGE CRITERIA MANUAL (V. 2) <br /> <br />HYDRAULIC STRUCTURES <br /> <br />e <br /> <br />6.3 <br /> <br />Confluences........................................... ...... .... ....,.................... ........... ....................... HS-95 <br />6.3.1 Subcritical Flow Confluence Design .............................................................. HS-96 <br /> <br />7.0 RUNDOWNS.......................................,...,....... ..... .................... ....................................... ......... HS-99 <br />7.1 Cross Sections ............................................,............................................................... HS-99 <br />7.2 Design Flow................... ..................... ...,.......... ...... ............. ...... ................................. HS-99 <br />7.3 Flow Depth..................... ............... .................... ...... .................................................. HS-1 00 <br />7.4 Outlet Configuration for Trickle Channel................................................................... HS-100 <br />7.5 Outlet Configuration for Wetland Channel ................................................................ HS-1 00 <br />7.6 Grouted Riprap Rundowns ....................................................................................... HS-100 <br /> <br />8.0 MAINTENANCE........ ....... .................... ........... ............... ..................,. ..... .......... ..... .......... ..... HS-1 02 <br />8.1 General............................ ............... .................................... .... ...... ..... ........................ HS-1 02 <br />8.2 Access................... ................... .......................................... .... ...... ,..., .......... ..... ......... HS-1 02 <br />8.3 Maintenance Optimization ............................ ..... ................ .... ...... ..................., ......... HS-1 02 <br /> <br />9.0 RETROFITTING BOATABLE DROPS............... .................... ..... ....,... ............ ......... .... .......... HS-1 03 <br /> <br />9.1 Introduction..,............................................. .... ...... ..... ..... ............................ ............... HS-1 03 <br />9.2 Retrofitting Existing Structures.. ..................................... ........................ .......... ..... .... HS-1 03 <br />9.2.1 Downstream Face ........................................................................................ HS-1 03 <br />9.2.2 Boat Chute ................................................................................................... HS-1 03 <br />9.2.3 Sharp Edges... .... .................... '...... ............................. ........... ......... ............. HS-1 03 <br />9.2.4 Barriers and Signing....... ..................., ...... ,.... .............. ................ ................. HS-1 03 <br />9.2.5 Portages..... ........... ................... ...... .... ........................,. ...., ...... ..................... HS-1 04 <br />9.3 Safety.. ..................... ..... ..... ................... ................ ........................ ..............., ............ HS-1 04 <br /> <br />10.0 STRUCTURE AESTHETICS, SAFETY AND ENVIRONMENTAL IMPACT..........................HS-105 <br /> <br />10.1 Introduction .....................................................................,......................................... HS-1 05 <br />10.2 Aesthetics and Environmental Impact..................................,......... ........................... HS-1 05 <br />10.3 Safety...................................... ............................................. .....,...... ..... ...,..... ..... ...... HS-1 06 <br /> <br />e <br /> <br />11.0 <br />12.0 <br />Tables <br />HS-1 <br />HS-2 <br />HS-3 <br />HS-4 <br />HS-5 <br />HS-6 <br />e <br /> <br />CHECKLIST.. ...., ............................... .............,. ..... ......... ........................................................ HS-1 09 <br /> <br />REFERENCES............. ....................................... ,........., ...... .... ......... ...... ......... ........... ..... ..... HS-112 <br /> <br />Non-Boatable Drop Structure Selection for 3- to 5-Foot Vertical Drops <br />and 0 to 15.000 cfs................................................................................................................... HS-1 0 <br /> <br />Suggested Approximate Manning's Roughness Parameter at Design <br />Discharge for Sloping Drops ..... .... .............................. ........... ... ,. ......... ............ ........ .... ..... ....... HS-13 <br /> <br />Nominal Limit of Maximum Pressure Fluctuations Within the Hydraulic <br /> <br />Jump...............................,. ........... ...................................................... ..... ........... ......... .... ...... .... HS-18 <br /> <br />Grouted Sloping Boulder Drops: Minimum Design Criteria for Grass-Lined <br />Channels Meeting the District's Maximum Depth and Velocity Criteria.......,.........,............,.... HS-23 <br /> <br />Boulder Sizes for Various Rock Sizing Parameters.................................................................HS-25 <br /> <br />Vertical Drops With Grouted Boulder Basin: Minimum Design Criteria for <br />Grass-Lined Channels Meeting District Criteria ....................................................................... HS-29 <br /> <br />06/2001 <br />Urban Drainage & Flood Control District <br /> <br />HS-iii <br />