Acre Feet for a Pond or Lake
The Acre Feet of a Pond or Lake calculator computes a volume of water based on the surface area (A) and change in depth (h).
INSTRUCTIONS: Choose units and enter the following:
- (A) Surface Area of Pond or Lake
- (h) Change of Depth of Water
Volume (V): The calculator returns the volume of water in acre-feet (ac⋅ft). However, this can be automatically converted to other volume units (e.g. cubic inches, gallons, liters) via the pull-down menu.
The Math / Science
The shape the floor of a pond, lake or reservoir make it difficult to compute the total volume of water contained. However, if you can measure the surface area, you can roughly compute the volume of water associated with a change in depth. This calculator helps make that calculation and returns the volume in the units most commonly used for the volume of water in a reservoir, acre - feet (ac⋅ft).
The formula for volume from area and depth assumes a flat surface (A) and the depth or height measured perpendicular to the surface (h). The formula for the volume based on area and height is:
V = A • h
where:
- V = volume
- A = area
- h = height or depth
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