FLOOD06380

• County: Statewide
• Community: Adams/Arapahoe/Denver/Broomfield/Douglas/Jeffco
• Basin: Statewide
• Title: Urban Storm Drainage, Criteria Manual Volume 2
• Date: 6/1/2001
• Prepared By: Wright Water Engineers, Inc.
• Floodplain - Doc Type: Educational/Technical/Reference Information

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DRAINAGE CRITERIA MANUAL (V. 2)

TABLE OF CONTENTS

Urban Storm Drainage Criteria Manual

Hydraulic Structures

1.0 USE OF STRUCTURES IN DRAINAGE.................................................................................... HS-1

1 .1 Introduction. ..., ............... .... ................. ........................ ....... .... ...... ,.... ...' ,. ....,.. ............... HS-1
1.2 Channels Used for Boating ........................................................................................... HS-2
1.3 Channel Grade Control Structures................................................................................ HS-3
1.4 Wetland Channel Grade Control................................................................................... HS-3
1.5 Conduit Outlet Structures.............................................................................................. HS-3

1 .6 Bridges............ ............... .... ................. ..... ............... ........... .... ...... ................... ..... ......... HS-3
1.7 Transitions and Constrictions........................................................................................ HS-4
1.8 Bends and Confluences ................................................................................................ HS-4
1.9 Rundowns...................... ......................................... ........... .... ...... .................... ..... ........ HS-4
1.10 Energy Dissipation .................................................................,...................................... HS-4
1.11 Maintenance ......................... .............................................. .... ...... ...... ..... ...................... HS-5
1.12 Structure Safety and Aesthetics.................................................................................... HS-5
CHANNEL GRADE CONTROL STRUCTURES (CHECK AND DROP

STRUCTURES) . .......................... ..... .... ............ ..... ......... ............................................. .............. HS-6
2.1 Planning for the Future...............................................................,.................................. HS-6
2.1.1 Outline of Section ............................................................................................. HS-7
2.1.2 Boatable Channels........................................................................................... HS-8
2.1.3 Grass and Wetland Channels .......................................................................... HS-8
2.1.4 Basic Approach to Drop Structure Design ....................................................... HS-8
2.2 Drop Selection...... ................. .... ...... ...... ............................. .... ...... ............................... HS-1 0
2.3 Detailed Hydraulic Analysis .. .........................................................,............................ HS-1 0
2.3.1 Introduction......... ......... .................................... ...... .... ...... ...... ..... ... ................ HS-1 0
2.3.2 Crest and Upstream Hydraulics ..................................................................... HS-11
2.3.3 Water Surface Profile Downstream of the Cres!............................................ HS-11
2.3.4 Hydraulic Jump Location................................................................................ HS-13
2.3.5 Jump and Basin Length .................................................................................HS-15
2.3.6 Seepage Analysis ............................................................,....,........................ HS-15
2.3.7 Force Analysis............... .................... ........... ..... .......... .......... .............. ..... ...... HS-15
2.3.7.1 Shear Stress ................................................................................. HS-16
2.3.7.2 Overall Analysis ........................,.........,..............,.......................... HS-16
2.3.7.3 Impact and Drag Forces................................................................HS-16
2.3.7.4 Turning Force ................ ......... ...... ..... ........, ....... .... ......... ...... ......... HS-17
2.3.7.5 Friction........... ...... ..... ..............,... '. ,...,......., ..... ..... .................... ...... HS-17
2.3.7.6 Frost Heave.. .....,. ..... ..... .... ........................ ...... .............................. HS-17
2.3.7.7 Seepage Uplift Pressure ............................................................... HS-17
2.3.7.8 Dynamic Pressure Fluctuations .................................................... HS-17
2.3.7.9 Overall Analysis ..........,.................................................................HS-19
2.4 Simplified Designs for District's Grass-Lined Channel Drops..................................... HS-19
2.4.1 Introduction and Precautions ......................................................................... HS-19
2.4.2 Guidelines for Standard Grass-lined Channel Drops..................,.................. HS-19
2.4.3 Grouted Sloping Boulder Drops ..............................................'...................... HS-20
2.4.4 Vertical Hard Basin Drops.............................................................................. HS-25
2.5 Baffle Chute Drops... ...... ..... .......................... .............................................................. HS-29
2.6 Seepage Control................ ................. .......................................................... ..... ......... HS-33
2.6.1 Seepage Analysis Methods ........................................................................... HS-33
2.6.2 Foundation/Seepage Control Systems .......................................................... HS-34

2.0

6/2001
Urban Drainage and Flood Control District

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