5179Flood Report_REV_3

                                                                                 Callaghan & Toth



Add Rain # 10 L=0.030 U=0.20 I=0.55
Get.
Get.
Route L=0.030 U=0.50
Store.
Rain # 11 L=0.020 U=0.25 I=0.55
Get.
Route L=0.027 U=0.50
Store.
Rain # 12 L=0.020 U=0.25 I=0.60
Route L=0.020 U=0.50
Get.
Route L=0.062 U=0.00
Add Rain # 13 L=0.020 U=0.70 I=0.15
Store.
Rain # 14 L=0.015 U=0.25 I=0.55
Route L=0.020 U=0.50
Get.
Print. OUT
End of Catchment Definition.
1 Pluviographs:
Location. ARR_TEMPORAL_DATA
14 Subareas:
1 2 3 4 5 6 7
8 9 10 11 12 13 14
End of Pluviograph Data.
End of Gauging Station Data.




7.        REQUIRED STORAGE

An S-Q detention table is added to URBS catchment file Develop.Cat immediately after
subarea #13 to create catchment file Mitigate.Cat, hereafter. The S-Q data in that table is
successively adjusted until the model indicates that the adjusted storage on each line
matches the adjusted basin outflow on that line, and mimics the pre-development discharges
from the total catchment after adding the discharges from subarea #14. The resultant basin
storages, basin outflows and total outflows for each ARI are tabulated below.

     ARI (yrs)       Req’d Storage (m3)           Basin Outflow   Total Catchment Outflow
                                                    (m3/sec)              (m3/sec)
       100                      334                   0.87                  0.89
        20                      243                   0.58                  0.60
        5                       190                   0.39                  0.41
        1                       128                   0.14                  0.15


2 Pearson Rd Cooroy - Mitigate.cat
Model: Basic
Uses: L U I
Default Parameters: alpha=1.20 m=0.8
 14 Subareas of Area:
 0.0011 0.0010 0.0036 0.0032 0.0032 0.0026 0.0024
 0.0023 0.0019 0.0015 0.0054 0.0018 0.0016 0.0011
Factor=1.50

                                                                                           K
2035 2 Pearsons Road – Flood Study – Revision 3                               April 2021