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<br />emergency spillway. For existing dams, the vertical height shall be <br />..asured. by determining the slope of the foundation and height of the <br />dam at the downstream toe and extrapolating the height of the dam to <br />the longitudinal centerline. of the dam. The formula for detenoining <br />the vertical height of existing dams is: h. h. - f. - sl; where <br />h . vertical height, h. . height of dam from downstream toe, f. . <br />freeboard, s . slope of the natural ,surface of the ground, and 1 . <br />horizontal distance from the downstream toe to the longitudinal <br />centerline of the dam. The State Engineer shall have final authority <br />over determination of the vertical height (see Figure 2). <br /> <br />- 8 - <br />