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Chapter 9 Hydraulic Structures - UDFCD

September 2017 Urban Drainage and Flood Control District 9- i Urban Storm Drainage Criteria Manual Volume 2 Chapter 9 Hydraulic Structures Contents Structures in Streams .. 1 Grade Control Structures .. 2 Overview .. 2 Simplified design Procedures for Drop Structures .. 4 Introduction .. 4 5 Unit Discharge .. 6 Longitudinal Slope of the Drop structure 6 Stilling Basin .. 6 Seepage Analysis and Cutoff Wall design .. 7 Low-flow Channel .. 8 Detailed Drop structure Hydraulic Analysis .. 8 Introduction .. 8 Cross Section Placement .. 9 Mannings s Roughness Coefficient for Drop 10 Hydraulic Jump Formation .. 11 Hydraulic Jump Length .. 13 Evaluation of Low-flow Channel versus 14 Evaluate Additional Return Period Flow Rates .. 15 Rock Sizing for Drop Approach and Downstream of End Sill .. 15 Seepage Control .. 15 Introduction .. 15 Weep Drains .. 15 Lane s Weighted Creep Method.

the design discharge and functional needs of the structure. Hydraulic design procedures discussed herein govern design of all structures. For the design of unique structures that may not fit the guidance provided, hydraulic physical modeling or computational fluid dynamics (CFD) modeling may be beneficial. Photograph 9-1. This grouted boulder ...

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