Deep Well Dewatering
Deep Well Dewatering Systems tend to be used where the excavation depth exceeds the maximum limits for a wellpoint system, and a large quantity of water needs to be extracted.
Deep Well Dewatering Systems are ideal for keeping water away from construction trench areas. This enables work to be carried out in dry and stable conditions. A deep well dewatering system would be also be used if space is limited as deep wells can be sited away from the construction area.
Advantages.
- Drawdown only limited by depth of well and soil stratification.
- Pressure relief can be provided in deep layers.
- Wells can placed away from working areas (at the top of batters for example).
- Wells are usually installed at relatively wide spacing which minimises surface access restrictions.
Limitations.
- Relatively high installation costs per well
- Comprehensive, good quality site investigation information required for design.
- Flexibility of equipment is restricted because individual pumps cover limited range of flow and discharge head.
- Pumps are electrically powered so both duty and standby power supplies are required for reliability.
