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<br />TYPICAL CHANNEL AND FLOW CHARACTERISTICS <br /> <br />Much of the following material has been abstracted from publications by <br /> <br />Blodgett (1964 and 1966a) and Brice and Blodgett (1976). A more detailed <br /> <br />discussion of the hydraulic concepts and supporting data are included in these <br /> <br />publications. The complete citations are given in the list of selected <br /> <br />publications. Figures and table numbers referenced in the handout are those <br /> <br />given in original publications and only those that are pertinent to this <br /> <br />discussion are included. <br /> <br />Hydraulic Eroperties and Channel Geometry <br /> <br />There are a variety of procedures available for designing rock riprap to <br /> <br />protect streambanks from erosion. Diverse results may be obtained, however, <br /> <br />depending on the procedure used and assumptions concerning hydraulic and <br /> <br />geomorphic conditions. This diversity indicates a need to better understand <br /> <br />the various design concepts, and consequences of the selected riprap design <br /> <br />procedures. Riprap failures are usually attributed to excessive hydraulic <br /> <br />forces acting on the bank thlit cause displacement of the stones that comprise <br /> <br />the riprap. However, other factors, such as improper gradation or placement, <br /> <br />inadequate assessment of probable geomorphic changes, or failure of the <br /> <br />original bank material may also contribute to failure of the bank protection. <br /> <br />11 <br />