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This elasticity value, -0.28, shows the relatively inelastic effect of lag time changes on discharge, e.g., a 1% increase in lag time results in a 0.28% decrease

in

discharge.

Area,

as

proportional to discharge.

one would In this case a

expect, is purely 1% increase in area

elastic

and

would

result

directly in a 1%

increase in discharge.

5.2.3

Results from Elasticity Analysis

The effect of parameter variation on discharge is determined by multiplying elasticity results from Step 1 (sensitivity of SCS lag time to parameter variations) by Step 2 (sensitivity of flow to variations in discharge). The overall picture is shown once again in Figure 5.15.

Figure 5.15: Final Discharge Sensitivity Calculation

The effect of each parameter (longest flow path, slope, and curve number) on discharge was evaluated using the elasticity for both discharge (due to 119

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