Impact to the environment should be considered before deploying a high volume pump (HVP) to abstract water from open water at both insertion and delivery points. Particular consideration should be given to the cross-contamination of separate biological environments (biosecurity). For example, the areas could be environmentally sensitive or a Site of Special Scientific Interest (SSSI)

A HVP HydroSub module should be positioned on appropriate hard standing, at a suitable distance from the water source; this is used to provide the power and control to the water delivery system.

Each HVP HydroSub module is powered by a diesel engine to generate hydraulic pressure, with 60m hydraulic hose lines connected to a submersible pump; there are a limited number of HVPs equipped with 80m hydraulic hose lines.

The submersible pump requires a minimum water depth of 150cm and should not be allowed to run dry. The strainer should be kept clear of debris and the pump inlet should remain submerged to prevent dry running and burning out the carbon seal.

During operations the open water level may rise or fall; this should be considered during deployment and monitored for its impact on the function of the submersible pump. Assessment of the potential rise or fall of a water source should be considered prior to deployment and sufficient winch cable, hydraulic hose and delivery hose must be deployed to accommodate this.  Failure to do so may result in the need for further hose and cable to be released to enable the pump to float therefore resulting in a temporary cessation in pumping operations.

There is the potential for the accidental release of contaminants which could result in damage to the environment. This could be caused by accidental damage to, or mechanical failure of the HVP equipment. Contaminants could include:

• Diesel fuel
• Hydraulic fluid
• Engine oil
• Anti-freeze