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Parameter Sensitivity in Hydrologic Modeling - page 130 / 163

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%ChangeLag

%ChangeQ

%ChangeQ

%ChangeParameter

%ChangeParameter

%ChangeLag

variations in lag) and lag (due to variations in each parameter). These two elasticity values are multiplied together. Figure 5.16 outlines the results from the elasticity study.

LFP

Slope

CN

Discharge

E=-3.52*-0.28=0.99

E=0.80

E=-0.50

E=-3.52

E=0.80*-0.28=-0.22

SCS Lag Time

E=-0.50*-0.28=0.14

E=-0.28

Area

E=1.06

Figure 5.16: Elasticity Diagram

The following relationships can be drawn from Figure 5.16:

  • A 1% increase in longest flow path length decreases peak

discharge by 0.22%;

  • A 1% increase in slope increases peak discharge by 0.14%;

  • A 1% increase in curve number increases flow by 1%;

  • A 1% increase in drainage area increases flow by 1%.

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