Civil MDC

Threshold Channel Design

654.0800 Purpose 8–1 654.0801 Introduction 8–1 654.0802 Design discharges 8–2 654.0803 Allowable velocity method 8–3 (a) Calculate average velocity……………………………………………………………………8–3 (b) Determine allowable velocity……………………………………………………………….8–6 (c) Soil Conservation Service allowable velocity approach………………………..8–8 654.0804 Allowable shear stress approach 8–10 (a) Calculate applied shear stress…………………………………………………………….8–10 (b) Calculate allowable shear stress…………………………………………………………8–14 (c) Procedure for application of allowable shear stress method……………….8–23 (d) Limitations and cautions…………………………………………………………………….8–24 654.0805 Tractive power method 8–26 654.0806 Grass-lined channels 8–27 (a) Allowable velocity………………………………………………………………………………8–27 (b) Allowable shear stress………………………………………………………………………..8–28 (c) Species selection, establishment, and maintenance of grass-lined………8–30 channels (d) Determination of channel design parameters……………………………………..8–30 (e) General design procedure…………………………………………………………………..8–32 654.0807 Allowable velocity and shear stress for channel lining materials 8–37 654.0808 Basic steps for threshold channel design in stream restoration 8–38 projects 654.0809 Conclusion 8–43

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