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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.

time, this change in hydrology may cause streambed degradation, otherwise known as down cutting or head cutting. Stabilization improvements to the strea m are necessary prior to or concurrent with development in the watershed. Stream stabilization is the third step of the Four Step Process to Stormwater Management (see

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