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GDSM Calculation Sheet
Job Description: Cooroibah
2
Area: 4.34 km
Portion of Area considered:
Smooth, S = 0 (0.0 to 1.0) Rough, R = 1.00 (0.0 to 1.0)
Elevation Adjustment Factor (EAF)
Mean Elevation: 20 mAHD
Adjustment for elevation (-0.05 per 300m above 1500m) 0.00
EAF = 1.00 (0.85 to 1.00)
Moisture Adjustment Factor (MAF)
MAF = 0.87 (0.4 to 1.00)
PMP Values (mm)
Duration Initial Initial PMP Rounded Intensity
(hours) depth - depth - Estimate PMP to (mm/hr)
smooth rough (DSxS + nearest
(DS) (DR) DRxR) xMAF 10 mm
xEAF
0.25 223.98 223.98 194.86 190 760
0.50 328.64 328.64 285.92 290 580
0.75 414.64 414.64 360.74 360 480
1.0 483.3 483.3 420.47 420 420
1.5 550.13 623.79 542.70 540 360
2.0 616.3 728.94 634.18 630 315
2.5 656.3 802.11 697.84 700 280
3.0 690.79 878.6 764.38 760 253
4.0 755.79 1005.75 875.00 880 220
5.0 815.79 1106.6 962.74 960 192
6.0 862.45 1173.09 1020.59 1020 170
J GSDM,PMP Rainfall Intensities.xls,4:58 PM,23/02/2022,1
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