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The Possible Recharge in Sandy Alluvial Area refers to the gross recharge minus the natural recharge of the area, specifically calculated for sandy alluvial formations which have characteristic water retention and transmission properties.
The calculator uses the formula:
Where:
Explanation: The formula calculates the potential water recharge by considering the annual water level fluctuation (multiplied by 12 for annualization), watershed area, and subtracting the total water extracted from the system.
Details: Accurate recharge estimation is crucial for sustainable water resource management, groundwater modeling, and planning water extraction activities in sandy alluvial areas which are typically productive aquifers.
Tips: Enter water level fluctuation in meters, watershed area in square meters, and gross water draft in cubic meters per second. All values must be positive numbers.
Q1: Why is the factor 12 used in the formula?
A: The factor 12 converts monthly water level fluctuation to an annual basis, providing a yearly recharge estimate.
Q2: What is typical specific yield value for sandy alluvial areas?
A: Sandy alluvial areas typically have specific yield values ranging from 0.15 to 0.25, depending on grain size distribution and compaction.
Q3: How does water level fluctuation affect recharge?
A: Greater water level fluctuations generally indicate higher recharge potential, as they reflect the aquifer's response to infiltration and water movement.
Q4: What are the limitations of this calculation?
A: This calculation assumes homogeneous aquifer properties and doesn't account for spatial variability in specific yield or complex hydrological processes.
Q5: How often should recharge calculations be updated?
A: Recharge calculations should be updated annually or whenever significant changes occur in land use, climate patterns, or water extraction rates.