RESPONSE TO FURTHER ADVICE - ADG1808.25 Dewatering Management Plan_Rev0_07.05.25 · MCU25/0054

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

 

Contents

— Calculator
— Tools for calculating the radius of influence and pumping rates and times for dewatered excavations
— Related services and information

 

 

 

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

soil areas.

Broad-scale acid sulfate soil risk maps for several coastal regions of WA are acoessible vis Data WA [2
Empirical methods to calculate the radial extent of the groundwater cone of depression and purnping rates

and times for dewatering operations are outlined in National Acid Sulfate Soils Guidance: Guidance for the
dewatering of acid sulfate soils in shallow groundwater environments (2

Calculator

Input

Length of excavation: 21 metres

Width of excavation: metres
Drawdown required: 22 metres

Aquifer thickness!" metres
Hydraulic conductivity: o.0000949 metres/second
Results

Effective purnping radius, 2. : 9 metres

Cone of depression radius, Ro 64 metres

Total pumping rate: 6 litres/second

Pumping time required: 69 hours

Related page
Acad sulfate soils

Provided by

Depertment of Water and Environmental
Regulation

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