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Revised Stormwater Mangement Plan
Attached to the e-mail Email 2 of 2 - Outstanding Matters - 67 Elanda Street - MCU21/0190.
Original PDF page 51, section 1. The text section number identifies this passage in the reader.
Plans and drawings
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Log in to see the plans as drawn PRE & POST DEVELOPMENT STORMWATER DISCHARGE CALCULATION
Spreadsheet based on QUDM 5.02, "The Rational Method"
Project Number WCD-22936
Project Address 65-67 Elanda Street, Sunshine Beach
Description SWMP
Designer JP
Date 11-Jan-21
EXISTING USE PROPOSED USE
Co-efficent of Run-Off Calculation Co-efficent of Run-Off Calculation
Catchment Name Area (m2) Co-efficent Catchment Name Area (m2) Co-efficent
Impervious 121 0.900 Impervious 695 0.900
Pervious 899 0.700 Pervious 325 0.700
Total Area 1020 Total Area 1020
Adopted C10 : 0.724 ; Co-efficent of Run-Off Adopted C10 : 0.836 ; Co-efficent of Run-Off
Tc (min.) : 8 ; QUDM Table 5.05.1 Tc (min.) : 6 ; QUDM Table 5.05.1
Area (ha) : 0.102 (10,000m2 = 1 ha) ; QUDM Table 5.05.5 Area (Ha) : 0.102 (10,000m2 = 1 ha) ; QUDM Table 5.05.5
Flood Event Existing Post Development RAINFALL INTENSITY Peak Outflow Capacity Peak Inflow Rate Difference
ARI Cy = Fy x C10 Cy = Fy x C10 Existing Post Development Qo (Existing) Qi (Post Development) Qi-Q0 (Post - Pre)
1 0.579 0.669 133.44 mm / hr 144.48 mm / hr 0.022 0.027 0.005
2 0.615 0.711 150.48 mm / hr 162.96 mm / hr 0.026 0.033 0.007
5 0.688 0.794 203.04 mm / hr 221.28 mm / hr 0.040 0.050 0.010
10 0.724 0.836 237.6 mm / hr 259.2 mm / hr 0.049 0.061 0.013
20 0.760 0.878 270.24 mm / hr 295.68 mm / hr 0.058 0.074 0.015
50 0.832 0.962 312 mm / hr 343.2 mm / hr 0.074 0.094 0.020
100 0.868 1.000 342.72 mm / hr 378.24 mm / hr 0.084 0.107 0.023
Rational Method Rational Method
Where Coefficients of Runoff calculated from the above equation exceed
Q = CIA / 360 Q = CIA / 360
1.00, they should be arbitarily set to 1.00. QUDM Table 4.05.2
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