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e e e DRAINAGE CRITERIA MANUAL (V. 2) TABLE OF CONTENTS 7.1 7.2 7.3 7.4 7.5 7.6 Cross Sections ................. ...................................................,.....,................................. HS-99 Design Flow............, ........................................ ......................................................... HS-99 Flow Depth ................................................................ ................................................ HS-1 00 Outlet Configuration for Trickle Channel.........................,......................................... HS-1 00 Outlet Configuration for Wetland Channel ................................................................ HS-1 00 Grouted Riprap Rundowns .................................. ..................................................... HS-1 00 8.0 MAINTENANCE..................................................................... ........... ..................................... HS-1 02 8.1 General...................................................................................................................... HS-1 02 8.2 Access....................................................................................................................... HS-1 02 8.3 Maintenance Optimization ........................................................................................ HS-1 02 9.0 RETROFITTING BOATABLE DROPS................................................................................... HS-103 9.1 Introduction...................... ....................................,........................................ ............ HS-1 03 9.2 Retrofitting Existing Structures.................................................................................. HS-1 03 9.2.1 Downstream Face ........................................................................................ HS-1 03 9.2.2 Boat Chute ,.............................,............... ..................................................... HS-1 03 9.2.3 Sharp Edges...................... ...................................................,........ ...... ........ HS-1 03 9.2.4 Barriers and Signing..................................................................................... HS-1 03 9.2.5 Portages ........... ................................................................................ ............ HS-1 04 9.3 Safety........................................................."............................................................. HS-1 04 10.0 STRUCTURE AESTHETICS, SAFETY AND ENVIRONMENTAL IMPACT..........................HS-105 10.1 introduction...,.....................................................................................,..................... HS-1 05 10.2 Aesthetics and Environmentai Impact............................................,.......................... HS-1 05 10.3 Safety................................................................................................................. ....... HS-1 06 11.0 CHECKLIST ...,....................................................................................................................... HS-1 09 12.0 REFERENCES....................................................................................................................... HS-112 Culverts 1.0 INTRODUCTION AND OVERVIEW ..........................................................................................CU-1 1.1 Required Design Information ........................................................................................CU-3 1.1.1 Discharge .........................................................................................................CU-4 1.1.2 Headwater ........................................................................................................CU-4 1.1.3 Tailwater........................................... ................................................................CU-5 1.1.4 Outlet Velocity ..................................................................................................CU-5 2.0 CULVERT HyDRAULICS....... ..... ..............................................,....,.......................................... CU-6 2.1 Key Hydraulic Principles ................................................,.....................................,........CU-6 2.1.1 Energy and Hydraulic Grade Lines ..................................................................CU-6 2.1.2 Inlet Control......................................................................................................CU-8 2.1.3 Outlet Control......................................... ..........................................................CU-9 2.2 Energy Losses ............................................................................................................ CU-11 2.2.1 Inlet Losses .................................................................................................... CU-11 2.2.2 Outlet Losses .................................................................................................CU-11 2.2.3 Friction Losses ...............................................................................................CU-11 3.0 CULVERT SIZING AND DESIGN ............................................................................................CU-13 3.1 Description of Capacity Charts ...................................................................................CU-13 3.2 Use of Capacity Charts ...............................................................................................CU-14 3.3 Use of Nomographs ....................................................................................................CU-14 3.4 Computer Applications, Including Design Spreadsheet..............................................CU-16 3.5 Design Considerations....................................,........................................... ................ CU-16 3.5.1 Design Computation Forms ...........................................................................CU-16 6/2001 Urban Drainage and Flood Control District TOC-iii