ADG1304.21 Dewatering Management Plan_Rev1.1_17.12.24

Cone of Depression calculator

This tool can be used to calculate the groundwater cone of depression in potential acid sulfate soil areas.

Last updated: 2 May 2023

Preliminary assessment of the radial extent of the cone of depression and pumping rates and times for all Related page
dewatering operations is critical for assessing the risk of disturbing acid sulfate soils in potential acid sulfate

soil areas

Acid sulfate soils

 

Broad-scale acid sulfate soil risk maps for several coastal regions of WA are accessible via Data WAG Provided by
Empirical methods to calculate the radial extent of the groundwater cone of depression and pumping rates Department of Water and Environment
and times for dewatering operations are outlined in National Acid Sulfate Soils Guidance: Guidance for the Requistion
dewatering of acid sulfate soils in shallow groundwater environments
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Calculator f Xin &

Input

Length of excavation 23 metres

Width of excavation 20 metres

Drawdown required 2.1 metres

Aquifer thickness") 16 metres

Hydraulic conductivity: 0.0000949 metres/second

Results

Effective pumping radius, Re 12 metres

Cone of depression radius, R,, 61 metres

Total pumping rate 12. litres/second

Pumping time required 35 hours