If suitable de-watering wellpoint pumps are selected, the de-watering work becomes much easier and the cost of de-watering also reduces, and work will progress fast.
01. Pump Size
The pump size must be selected depending on the amount of water to be removed. Construction site pumps can run from 1-2kW up to over 10kW. If water extraction is expected to continue for an extended period over a wide surface area, it is recommended to purchase multiple de-watering pumps for distributed removal of water from the site.
02. Discharge Head
Discharge head is the depth the pump must go in the ground, to lift the water to the other site. If for different well points, the discharge head is different than accordingly the pump must be selected rather than installing pumps with same discharge head capacity.
03. Flow Rate
You always want to install a pump that will flush the site of water at the right flow volume in the desired time. It all depends on size of a de-watering wellpoint project, the size of excavation and quantity of groundwater.
04. Availability of Electricity
If electricity is easily available on the site, then electric de-watering pumps must be employed while considering the cord length required. If electricity is not available, then diesel driven de-watering pumps may be employed for de-watering.
05. Waste/Sludge Removal
In some cases, sludge, construction materials, silty water or muddy water and other components may also have to be extracted along with the water. Contractors have options to handle any composition:
- Drainage pumps – for pumping water with less abrasive solids
- Sludge pumps – for non-abrasive sediment and sludge removal
- Slurry pumps – for removing water with abrasive suspended solids like sand, gravel or concrete.
The above criteria must be kept in mind while selecting the pump for de-watering. The correct de-watering pump with the suitable de-watering method will make the dewatering work efficient and easy.
