Callaghan and Toth IWMP Report revised

Figure 3:   URBS Model Layout For Post-Development Scenario

The pre-development and post-development models shared the same operating parameters – namely, an
alpha parameter of 2.0 and an m parameter of 0.80, with reach factor lengths varying from 2.0 to 2.6 in
0.1 increments for ARI’s from 100 year down to 1 year. Rainfall intensities and temporal patterns were
ARR87 standard, and infiltration rates in both models were specified as zero initial loss and 2 mm/hour
continuing loss, as accepted by a Noosa Council representative in a telephone conversation of 12 th
December 2017.




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