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General Design for Modifications to Existing Lower Santa Ana Drop Structures

by Herman O. Turner, Jr., US Army Engineer Waterways, Experiment Station, Vicksburg, MS, USA,
Michael E. Mulvihill, US Army Engineer Waterways, Experiment Station, Vicksburg, MS, USA,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

A model study conducted at the Waterways Experiment Station investigated the possibility of utilizing the existing drop structures of the Santa Ana River. Initial tests on selected existing drop structures showed that an oscillating hydraulic jump would form at discharges expected during a flood event. A sequent depth analysis was performed on each drop structure tested. From these sequent depths, dimensions of the modifications were sized. Modifications tested included a parabolic crest, one row and two rows of baffle blocks, and a sloping endsill. The general drop structure design which evolved is based upon energy head and the sequent depths.

Subject Headings: Drop structures | Hydraulic design | Hydraulic structures | Hydraulic models | Hydraulic jump | Existing buildings | Structural models

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