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<br />emergency spillway. For existing dams, the vertical height shall be <br />measured 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 determining <br />the vertical height of existing dams is: h = hd - fb - sl; where <br />h = vertical height, hd = height of dam from downstream toe, fb = <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 />