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The second step in quantifying the discharge elasticity with respect to parameter variation involves determining the variation in discharge with variation

in SCS

lag time.

This

TxDOT.

For each

return

step requires running a period, the HEC-1 model

HEC-1 was run

model developed seven times. The

by lag

times were

  • -

    5%, -10%,

changed in and -20%)

each sub-basin by an equal percentage (5%, 10%, 20%, for each run. The resulting linear equations were used to

determine discharge elasticity, or the percent variation in discharge caused fluctuations in SCS lag time. Dividing the percent variation in discharge by

by the

percent variation in SCS lag time gives discharge elasticity lag time for each return period. This describes the percent resulting from a 1% change in SCS lag time.

with respect to SCS change in discharge

Table 6.1 shows the overall discharge elasticity with respect to each

parameter. variations) variations) parameter.

Results from the first step (sensitivity of lag time to parameter and the second step (sensitivity of discharge with respect to lag time are multiplied to produce discharge elasticity with respect to each

Parameter LFP Slope CN Area

Elasticity Lag-Parameter

Elasticity Qavg-Lag

Elasticity -Parameter

Qavg

0.80 -0.50 -3.52 ---

-0.28 -0.28 -0.28 ---

-0.22 0.14 0.99 1.06

Table 6.1: Elasticity Analysis

132

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