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Figure 5.7: Slope Gradient Calculation

The elasticity of lag time with respect to slope is calculated as –4.8/9.7, or

  • 0.50. In other words, a 1 % increase in slope will cause a 0.5% decrease in SCS

lag time.

5.2.1.3 Curve Number

The lag time elasticity with respect to curve number was determined for Area 2 by holding slope and longest flow path constant, and varying the curve number. Curve numbers for Area 2 are shown in Table 5.8. These are the same values shown earlier in Table 5.4.

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