Farm Water Calculator: the annual balance

Dam Volume

The Dam volume supply figures below will prepopulate based on your Annual average rainfall & Annual average PAN evaporation in step 1.
View the information in a table format

Error: Annual evaporation (mm/year) and Annual average rainfall (mm/year) has not been entered in the property details section (Step 1).
No value for the evaporation losses can be populated below without this figure.

Dam Type	Depth (m)	Top radius	Top Length (m)	Top Width (m)	Surface area (m2)	Dam Volume ML	Evap. Losses ML/yr	Seepage Losses ML/yr	Rain onto Dam ML/yr
Select Dam type Circular Rectangle/square Gully
Select Dam type Circular Rectangle/square Gully
Select Dam type Circular Rectangle/square Gully
Select Dam type Circular Rectangle/square Gully
Select Dam type Circular Rectangle/square Gully
Dam Water Totals:

Please note: The dam calculations assume a batter slope of 3:1
The gully dam formula used calculates the natural storage only.

Please refer to the following:
Determining the evaporative loss from a farm dam
Seepage Losses from farm dams

Tank Volume

Tank Name	Tank Height (m)	Tank Radius (m)	Tank Volume (Litres/year)
Total Water Tank Volume (L)
Total Water Tank Volume (Megalitres)

Overall farm water storage

Total Dam Volume:	0
Total Tank Volume:	0
Total farm water storage	megalitres/year