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The Possible Recharge formula calculates the potential groundwater recharge by accounting for various hydrological components. It represents the gross recharge minus natural recharge plus additional groundwater flows and stream recharge contributions.
The calculator uses the formula:
Where:
Explanation: The formula accounts for the total water infiltration from rainfall, subtracts the base flow contribution, and adds net groundwater outflow and stream recharge to determine the possible groundwater recharge.
Details: Accurate possible recharge estimation is crucial for water resource management, groundwater sustainability assessment, and understanding the hydrological balance of a catchment area.
Tips: Enter all values in Cubic Meter per Second. Ensure all inputs are non-negative numbers representing the respective hydrological components.
Q1: What is the difference between gross recharge and possible recharge?
A: Gross recharge refers to total water infiltration from rainfall, while possible recharge accounts for additional groundwater flows and adjustments for base flow contributions.
Q2: Why subtract base flow in the calculation?
A: Base flow represents water that has already contributed to stream flow and is not available for groundwater recharge, hence it is subtracted from the gross recharge.
Q3: What does net groundwater flowing outside catchment represent?
A: This represents the steady-state groundwater flow through aquifers that moves outside the catchment area, which needs to be accounted for in recharge calculations.
Q4: How is recharge from streams incorporated?
A: Stream recharge (Is) represents the hydrologic process where water moves downward from surface water to groundwater, adding to the overall recharge potential.
Q5: What are typical values for these parameters?
A: Values vary significantly based on geographical location, soil type, rainfall patterns, and hydrological characteristics of the catchment area.