June 2022 G-01483.84-017-R-Rev0 Because the 42 Table 18: Final Stage (Q17) catchment characteristics and peak runoff estimation. Catchment type Catchment reference Cumulative area (km2) Flow path length (m) Elevation change (m) Time of concentration (mins) Peak flow (m3/s) WRS SW02 to seepage pond inlet 0.0042 290 28 3.8 0.039 WRS SW03 (to culvert crossing 1) 0.0067 150 40 1.5 0.062 WRS SW03-SW09 (to culvert crossing 2) 0.0517 530 55 5.8 0.425 Clean CW North (to culvert crossing 4) 0.019 425 95 3.7 0.840 Clean CW South (to culvert crossing 5) 0.013 408 77 3.8 0.555 Clean CW south (to culvert crossing 6) 0.015 488 100 4.0 0.653 Clean CW Low South (to culvert crossing 7) 0.001 105 11 1.7 0.058 WRS SW South Haul/Access (culvert crossing 8) 0.053 975 104 9.3 0.496 Clean CW South East (to culvert crossing 9) 0.020 332 79 3.0 0.875 7.5.3 Culvert Sizing Culvert sizes were estimated at this study level assuming inlet control (i.e., the outlet is not submerged) for concrete pipe culverts. Culvert locations with channel type are referenced in Figure 13 and Figure 14. A standard size of 825 mm diameter pipe was selected and the number of barrels adjusted to flow. The results of the sizing of culverts for the 1:10 AEP storm event are presented in Table 19.
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