- 6th June 2018
- Posted by: Sophie Bunker
- Category: Projects
The catchment of the Field House Drain had been affected by mining subsidence following the extraction of coal from Hatfield Colliery in South Yorkshire. The extraction of coal from a number of panels up to 700m below ground level resulted in a number of low spots in the drainage ditches and agricultural fields within the area. This led to the installation of temporary pumps within the catchment to remove land drainage water from the subsided area.
A report outline of the possible options to remediate the subsidence in the area was provided for the client. Due to environmental restrictions on the design, the traditional open drain approach to the pumping station was not an option.
An assessment of the catchment and subsided areas was carried out prior to producing an optioneering report on behalf of the client. Subsequently, we were commissioned to complete the outline and detailed design of a new land drainage pumping station with a 300 litre per second capacity. Land drainage waters would then be transported to the site by a number of culverts reaching up to 5m below ground level.
Through early contractor involvement, and clear communication with stakeholders, the scheme was delivered both on time and under budget. We carried out the procurement of civil, mechanical and electrical contractors, followed by the contract management of the on-site delivery of the scheme. The Pumping Station is now operated by the Shire group of IDB’s on behalf of the Danvm Drainage Commissioners.
Following the construction of the Field House Pumping Station, land drainage in the area was restored to the level of the pre-mining scenario. Early contractor involvement led to a reduced programme and more cost-effective solution.
The adoption and specification of variable speed pump drives resulted in lower operating costs for the client. Telemetry and variable speed motor drives at the pumping station allowed for the implementation of a whole catchment approach to Water Level Management.