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<br />TABLE 3 - VERTICAL RIPRAP DROP STRUCTURE DESIGN CHART <br /> <br />C Vn Yn&Yz P B A L D E RIPRAP <br />(ft) (fps) (ft) (ft) (ft) (ft) (f~) (ft) (ft) CLASS. <br />2 5 4 0.1 0.6 2.0 20 4 3 M <br />2 5 5 * 0.8 2.5 25 5 4 H <br />2 5; 7 4 0.1 0.8 2.5 20 5 4 H <br />2 5; 7 5 * 0.8 2.5 25 5 4 H <br />3 5 4 0.1 1.0 2.5 20 5 4 H <br />3 5 5 * 1.0 2.5 25 5 4 H <br />3 5; 7 4 0.1 1.0 2.5 20 5 4 H <br />3 5; 7 5 * 1.0 2.5 25 5 4 H <br />4 5 4 0.1 1.2 3.5 20 7 5 VH <br />4 5 5 * 1.2 3.5 25 7 5 VH <br />4 5; 7 4 0.1 1.4 3.5 20 7 6 VH <br />4 5; 7 5 * 1.4 3.5 25 7 6 VH <br /> <br />* See Table 2 to Calculate P <br /> <br />NOTES: <br />1. <br />2. <br /> <br />3. <br />4. <br /> <br />See Figure 3 for definition of symbols <br />See "Urban Stonn Drainage Criteria Manual" for <br />riprap gradation, classification and bedding <br />requi rements. <br />Maximum Allowable C = 4.0' <br />This chart is for ordinary riprap structures on1y:l; . <br />The dimensions contained herein should not be used <br />for grouted riprap or other types of drop <br />structures. Other types of drop structures require <br />their own hydraulic analysis. <br /> <br />lto <br />