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Storm Water - Lex Toth
Attached to the e-mail Operational Works Application OPW19/0133 - DA Form 1 - Pre-lim Construction Management Plan - Civil Plans - 10 Opal St Cooroy.
Attached to the e-mail MCU19/0013 & RAL19/0003 - Response to Information Request - 10 Opal St Cooroy.
APPENDIX 1: SUMMARY OF RETENTION CALCULATION RESULTS
10 OPAL ST DUPLEX
Pre-Development Case
501m² Catchment
tc = 6 min., C=0.70
Cf50%=0.85, Cf10%=1.00, Cf1%=1.20
Q1% flow = 0.0346 m³/s
Q10% flow = 0.0198 m³/s
Q50% flow = 0.0125 m³/s
Post-Development Case (No Detention)
501m² Catchment
Roof = 222m²
Grass/Landscaping/Driveway = 279m²
tc = 6 min., Roof C=0.98, Grass/Landscape/Driveway C=0.73
Cf50%=0.85, Cf10%=1.00, Cf1%=1.20
Q1% flow = 0.0384 m³/s
Q10% flow = 0.0238 m³/s
Q50% flow = 0.0150 m³/s
Post-Development Case (with Detention)
501m² Catchment
Roof = 222m²
Grass/Landscaping/Driveway = 279m²
tc = 6 min., Roof C=0.98, Grass/Landscape/Driveway C=0.73
Cf50%=0.85, Cf10%=1.00, Cf1%=1.20
Q1% flow = 0.0255 m³/s
Q10% flow = 0.0158 m³/s
Q50% flow = 0.0105 m³/s
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