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Reference Douments - 132004.4029.01 & RAL22/0010
Site Catchment Areas for DRAINS Modelling
Project number: 20220116 Calculations: B. Parry
Street Address: 6 Martin St
Locality: Peregian Beach, NSC Date: 6/09/2022
Existing Site
Existing Site Directly connected (m²) Indirectly connected (m²)
6 Martin St Roof 336.0 336.0 -
Impervious Ground 52.5 - 52.5
Driveway 103.9 103.9 -
Total Imp 492.4 439.9 52.5
Total Per 390.4 - 390.4
Site Area 882.8 439.9 52.5
% impervious Effective DCIA = 75% DCIA ICIA +25% ineffective DCIA
329.9 162.5
Impervious 55.8% 37.4% 18.4%
Pervious 44.2%
Proposed Site
Proposed Directly connected (m²) Indirectly connected (m²)
6 Martin St Roof 432.3 432.3 -
Impervious Ground 77.8 - 77.8
Driveway 92.3 92.3
Total Imp 602.4 524.6 77.8
Total Per 280.4 - 280.4
Site Area 882.8 524.6 358.2
% impervious Effective DCIA = 75% DCIA ICIA +25% ineffective DCIA
393.5 209.0
Impervious 68.2% 44.6% 23.7%
Pervious 31.8%
Document Set ID: 22141549
Version: 1, Version Date: 18/10/2022
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