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
proportional to discharge.
one would In this case a
expect, is purely 1% increase in area
directly in a 1%
increase in discharge.
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