STORMWATER DRAINAGE EXPERTS
Scroll down to estimate your required volume in 3 easy steps.
The result of the calculation will display how many polypropylene soakwells you need at 100% and 75% of the calculation, the total size of the soakwell, the total volume provided and the amount of spoil left over from the excavation.
The impervious surfaces of your home such as your roof and driveway are known as the catchment areas. Most councils provide a calculation based on historical local rainfall that is used to ensure you have adequate drainage for your home during storms. Those councils that do not specify use the 1 in 20 year event for calculations. Some council's require far more volume for a variety of reasons.
The calculation is based on the size of the impervious area (roof / ground), the predicted rainfall of a locality and a duration. With the calculator you can estimate the amount of stormwater runoff that will need to be accomodated by the soakwell.
| 100% Volume | 1.25 m3 / 1250 Litres |
|---|---|
| Quantity | 9 x 140 litre soakwells. |
| Volume Provided | 1260 Litres / 1.26 m3 |
| Dimensions | 4.5m long x 500mm wide. |
| Excess sand | 1.70 m3 |
| 75% Volume | 0.94 m3 / 937.5 Litres |
|---|---|
| Quantity | 7 x 140 litre soakwells. |
| Volume Provided | 980 Litres / 0.98 m3 |
| Dimensions | 3.5m long x 500mm wide. |
| Excess sand | 1.32 m3 |