Farm Water Calculator: Additional information
Potential Catchment Supply
The algorithm to calculate the potential catchment supply:
- A = catchment area in Hectares
- R = average rainfall in mm
- Y = runoff coefficient %
- ((0.0212 x R) - 5.9464) x Soil profile factor x Location factor x Ground cover factor
- A x R x Y divided by 10000
Soil Factor
| Soil Profile Type | Factor |
|---|
| Highly permeable | 0.3 |
| Permeable | 0.6 |
| Medium textured | 1.0 |
| Heavy textured | 1.3 |
Ground Cover Factor
| Soil Profile Type | Factor |
|---|
| Annual pasture | 1.0 |
| Improved pasture | 0.5 |
| Timbered | 0.5 |
Location North/South of divide Factor
| Location | Factor |
|---|
| North of the divide | 0.9 |
| Along the divide | 1.0 |
| South of the divide | 1.1 |
Page last updated: 26 Jun 2025