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RIP-RAP

RIP-RAP . Equation Selection and Rock Sizing Common Rock Sizing Relations HEC-11. USACE. Isbash CALTRANS. USBR. ASCE. USGS. DEVELOPMENT OF. RELATIONSHIPS. Common Rock Sizing Relations HEC-11. USACE. Isbash CALTRANS. USBR. ASCE. USGS. HEC-11 Method Published by FHWA in 1989. Combination of theory and field observations Use in rivers and streams with: Discharges greater than 50 cfs Uniform or gradually varied flow conditions Straight or mildly curving reaches Uniform cross section geometry HEC-11 Method a3. D 50 = C s C sf d K1. HEC-11 Method a3. D 50 = C s C sf d K1. Where: D50 = stone size (ft). Cs = ( / (Gs-1) ). Csf = (SF / )( ). Va = average channel velocity (ft/s). d = average flow depth (ft). K1 = [ 1 (sin2( ) / sin2( ))](1/2).

– Water surface slope 0.00006 – 0.0162 – Maximum flow depths 4.8 – 48.5 ft – Average velocities 2.4 – 12.5 fps ... certainty in design parameters • SF = 1.3 - 1.6 for gradually varying flow with ... Shore Protection method to protect highway embankments

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  Design, Protection, Slope, Horses, Shore protection

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