Farm Water Calculator: Additional information

Dam Volume Calculations

Below is a list of algorithms used to measure the fields for Dam Volume

The algorithm to calculate the dam volume:

Batter slope = 3
d = Depth
L^t = Top length
L^b = Bottom length
- Bottom length = Top length - (2 x Depth x Batter Slope)
W^t = Top width
W^b = Bottom width
- Bottom width = Top width - (2 x Depth x Batter Slope)
Volume = ((L^t x W^t) + (L^b x W^b) + ((L^t + L^b) x (W^t + W^b))) divided by 6000 x d
- ((Top length x Top width) + (Bottom length x Bottom width) + (( Top length + Bottom length) x (Top width + Bottom width))) / 6000 x depth

The algorithm to calculate the surface area:

The algorithm to calculate the dam volume:

Batter slope = 3
R_t = Top radius
R_b = Base radius
- Base radius = Top radius - (2 x Depth x Batter Slope)
d = Depth
π = Pi (3.14159)
Volume = (ΠR_t² + ΠR_b² + (Π(R_t+R_b)²)) divided by 6000 x d
- ((Pi x (Top radius)²) + (Pi x (Base radius)²) + (Pi x (Top radius + Base radius)²)) / 6000 x depth

The algorithm to calculate the surface area:

The algorithm to calculate the surface area:

The algorithm to calculate the dam volume:

The algorithm to calculate the evaporative losses requires information from the annual evaporation (mm) Rainfall data grid can be found here:

ae = Annual Evaporation
a = Surface Area
Evaporative losses = (ae x a x 0.67) divided by 1000000
- (Annual Evaporation x Area x 0.67) / 1000000

The algorithm to calculate the seepage losses:

The algorithm to calculate the rain on dam surfaces requires information from the annual rainfall (mm). Rainfall data grid can be found here: