Examples
Examples
Try the starting example
- Measured pump discharge (m³/hour)
- 25
- Measured inflow (m³/hour)
- 10
- Available pumping hours
- 6
- Initial water volume (m³)
- 120
- Observed net removal rate (m³/hour)
- 15
- Scenario remaining volume (m³)
- 30
- Hours to remove initial water at observed rates
- 8
Try another scenario
- Measured pump discharge (m³/hour)
- 25
- Measured inflow (m³/hour)
- 20
- Available pumping hours
- 6
- Initial water volume (m³)
- 120
- Observed net removal rate (m³/hour)
- 5
- Scenario remaining volume (m³)
- 90
- Hours to remove initial water at observed rates
- 24
Calculation method
Calculation method
Observed net removal rate (m³/hour)
a-b
Scenario remaining volume (m³)
max(0,d-(a-b)*c)
Hours to remove initial water at observed rates
d/(a-b) if a>b else "No positive observed drawdown"
Symbols and units
- a
- Measured pump discharge (m³/hour)
- b
- Measured inflow (m³/hour)
- c
- Available pumping hours
- d
- Initial water volume (m³)
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- Constant observed rates only. No groundwater prediction, discharge authorization or geotechnical inference. Remaining volume may increase when inflow exceeds discharge. Supported limits: All numeric inputs must be finite. Only the explicitly described mathematical scenario is supported.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.