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<br />HYDRAULIC STRUCTURES <br /> <br />cy <br /> <br />HS-42 <br /> <br />DRAINAGE CRITERIA MANUAL (V. 2) <br /> <br />Channel Bed <br />Characteristics <br /> <br />Safety <br />Considerations <br /> <br />Design Flow <br />Range <br /> <br />Appropriate <br />Drop Designs <br />(listed in order <br />of preference) <br /> <br />Drop <br />Height <br />(Maximum) <br /> <br />No 0-500cfs <br /> <br /> <br />3 Ft._Is area likely to haveJ <br />h'gh public usage? l <br /> <br /> <br />Yes-O-15,OOOcfs <br /> <br />IGSB <br />VHB <br />BCD <br /> <br />IGSB <br />BCD <br /> <br />> 3 Ft._Vertical drops <br />not acceptable <br /> <br />IBCO <br />GSB <br /> <br />Is downstream channel <br />likely to degrade due <br />to lack of downstream <br />control or variable <br />stream bed conditions? <br /> <br />Ves <br /> <br />No <br />3 Ft._I~ area Iik.ely to have--1 <br />high public usage? I <br /> <br />Ves <br /> <br />IBCD <br />GSB <br /> <br />I BCD <br />GSB <br /> <br />> 3 Ft _ Vertical drops <br />. not acceptable <br /> <br />I BCD <br />GSB <br /> <br />WHERE: <br /> <br />VHB = VERTICAL HARD BASIN DROPS <br />GSB - GROUTED SLOPING BOULDER DROPS <br />BCD = BAFFLE CHUTE DROPS <br /> <br />FIGURE HS-1 <br />Probable Range of Drop Choices and Heights <br /> <br />06/2001 <br />Urban Drainage & Flood Control District <br /> <br />e <br /> <br />e <br /> <br />e <br />