Deepwell 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. They are ideal for keeping water away from construction trench areas enabling work to be carried out in dry and stable conditions. A deep well 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.

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