Instructions: Draw the dam boundary, then draw the surrounding catchment to calculate the respective areas.
Dam boundary is the estimated boundary when 100% full.
a: Draw dam
b: Draw catchment
Calculation variables
Dam area:
m2
Catchment area:
m2
Note:
Small farm dams must be approximately circular or square shapes, complex shapes are not supported by the water balance model.
Step 2: Dam profile
Instructions:
Select the profile that most closely matches the shape of your dam walls.
Calculation variables
Dam area:
m2
Catchment area:
m2
Select a profile:
Step 3: Dimensions
Instructions
Estimate the dimensions of the dam as accurately as possible to determine the maximum volume.
Calculation variables
Dam profile
Dam area:
m2
Catchment area:
m2
Maximum volume:
m3
Dimension estimates:
m
m
m
Step 4: Climate Estimates
Instructions: The monthly rainfall and evaporation range for the selected dam location has been estimated from the previous 20 years of
SILO weather data.
Calculation variables
m2
m2
m3
Water balance forecasts
The rating curve chart shows the volume of the dam in relation to vertical water level.
The water balance forecast chart shows the predicted water level and volume for various climate scenarios from the starting water level.
Dam area:
m2
Catchment area:
m2
Maximum volume:
m3
Maximum depth:
m
Current (Starting) depth:
m
Household demand:
people
Stock demand:
cattle
Stock demand:
sheep
Climate estimates
Changing any of the above variables will re-generate the charts and data tables.