The same steps were taken to determine the effect of drainage area on discharge as were taken to determine the effects of lag time on discharge. For each return period, the percent variation in discharge was calculated based on the
percent percent period
variation in drainage area (1.80%).
discharge for each was calculated by
return period. dividing each
were slight variations in elasticity for each return variation by 1.80% (the
variation in drainage area). There return period. These numbers were elasticity, as shown in Table 5.18.
were slight averaged to
differences in elasticity for each provide an approximate discharge
Table 5.18: Discharge Elasticity due to Area Variations
1.14 0.97 0.89 1.09 1.16 1.11
The resulting elasticity of discharge with respect to area is 1.06. Hence, a 1% increase in area yields approximately a 1% increase in discharge, as one would expect.
220.127.116.11 Step 2 Results
Results from the numerical calculations of gradient show that there is a constant, inversely proportional, relationship between lag time and discharge.