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<br />II. LEVEL 3: PHYSICAL MODEL STUDY <br /> <br />A. A physical model study was needed to determine the effects of the web <br />wall and angle of attack, <br /> <br />B. Physical Model Study - conducted at FHWA Turner-Fairbank Highway <br />Research Center hydraulics laboratory. <br /> <br />1, 1 :20 scale model. <br /> <br />2. Depth constant 0.305 m (1.0 foot), bed material 0.28 mrn. <br /> <br />3, Clear water with velocity at incipient motion (considered the worst <br />case scour depth); two skew angles (150 and 260); web wall at <br />different elevations above, at, and below the bed. <br /> <br />4, Assumed 0.45 m (1,5-foot) diameter columns for model. <br /> <br />5. Model scour depths were adjusted to prototype for model scale using <br />a velocity factor. <br /> <br />III. COMPARISON OF RESULTS <br /> <br />A. Physical model and HEC-18 results are shown in the followin9 table: <br /> <br />5.12 <br />