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Volume of water drained by gravity is defined as the quantity of water that is drained by gravity from a saturated aquifer or soil mass when subjected to gravity drainage.
The calculator uses the formula:
Where:
Explanation: The formula calculates the volume of water that can be extracted by gravity drainage from a given total volume of aquifer material, based on its specific yield percentage.
Details: Accurate calculation of water volume drained by gravity is crucial for groundwater resource management, well yield estimation, and designing effective drainage systems in hydrogeology and civil engineering projects.
Tips: Enter specific yield percentage (as a positive number) and total volume in cubic meters. Both values must be greater than zero for accurate calculation.
Q1: What is Specific Yield Percentage?
A: Specific Yield Percentage tells how much water is available for consumptive use from an aquifer or soil mass when drained by gravity.
Q2: How does Specific Yield differ from Porosity?
A: While porosity measures total void space, specific yield measures only the portion that drains freely under gravity, excluding water retained by capillary forces.
Q3: What are typical Specific Yield values?
A: Specific yield values typically range from 5% to 30% depending on the aquifer material, with coarse sands and gravels having higher values than fine-grained materials.
Q4: When is this calculation most useful?
A: This calculation is particularly useful in groundwater modeling, well design, and estimating sustainable yield from aquifers.
Q5: Are there limitations to this formula?
A: The formula assumes homogeneous material properties and may not account for complex geological formations or time-dependent drainage characteristics.