Large main contractor – Essex

REQUIREMENT

Three packaged pumping stations were required to remove water from a system of rainwater attenuation crates. High flow rates (77, 51 and 31 l/s) would be required. Following advice from Edincare on chamber dimensions and access cover size, concrete chambers would be constructed by the client using pre-cast concrete rings.

METHOD

• The Edincare design team specified the pumping stations based on site drawings. Vortex pumps up to DN150 size where specified to achive the required flow rates. Ductile iron pipework was used for its strength and durability.
• A heavy lifting mobile gantry was employed during pump and pipework installation.
• The pumping stations were fully commissioned by Edincare engineers, including installation of pumps, pipework, floats and control equipment housed in kiosks.

RESULT

• Installing pumping stations downstream of attenuation crates is cheaper than having large holding tanks with internal pumps.
• Pre-cast concrete rings are a cost effective and simple method of forming a chamber.
• Edincare’s design and engineering teams specified and commissioned the pumping stations to meet the site’s individual requirements.

FOCUS ON:

 

RAINWATER  ATTENUATION

Rainwater attenuation is required when a storm event could discharge water into the sewer system at flow rates higher than limits set by the local water authority.

Storm water is diverted to balance ponds, holding tanks or attenuation crates.

Pumping stations are then employed to discharge the water into the sewer at a controlled rate.

Our expert team can specify pumping stations to suit any site and water authority requirements.