Our specialist drainage teams use innovative solutions to construct bespoke solutions to meet your needs.

Our specialist drainage teams use innovative solutions to construct bespoke solutions to meet your needs.

At Thomas Bow we offer a comprehensive service for all aspects of water-related engineering including drainage, surface water, foul water, ducting and the general groundworks required for the construction of new infrastructure or development sites, as well as the repair and maintenance of existing sewerage systems.

We are able to advise you how you can limit the surface water runoff from your site using our innovative construction methods and products in order to design suitable drainage systems to satisfy the Environment Agency and planning authorities. We offer our drainage services across Derby, Leicester & Nottingham. 

Our expertise includes the following specialist areas 

  • Attenuation designs
  • Overland flow modelling
  • Traditional gravity drainage
  • Technical approvals

Flood Risk Assessments

A flood risk assessment (FRA) is a document that reviews a development in its proposal form to assess it against the risk of flooding, whether that be from groundwater, river (fluvial), surface water (pluvial), estuary/coastal (tidal), or from sewer sources.

 It should also take the surrounding area into account and whether the development poses a flood risk to areas nearby. Generally a scheme can be in a flood risk zone 1, 2 or 3.


Simply put soakaways are a hole dug into the ground, that is then filled with rubble and coarse stone allowing surface water to percolate back into the earth close to where it falls. 

An efficient and environmentally friendly way of dealing with surface water ( also called runoff, rain water or storm water). There will be a pipe leading into the soakaways, from the area where there is excess water like a gutter from a roof, driveway or a french drain. 

Permeable paving designs

Concrete Block Permeable Paving is an essential sustainable drainage (SuDS) technique. This allows water to pass through joint filling material in gaps between concrete paving blocks or flags into the underlying permeable sub-base. Here, it is stored and released gradually to help prevent flooding.

Adoption agreements

An adoption agreement is typically between the developer and water company that details the criteria of adoption. The developer agrees to build the sewers to an agreed standard, and maintain them for a certain amount of time after the development is occupied, usually a few years. 

​​Sustainable Urban Drainage Systems 

Sustainable urban drainage systems (SuDS) typically mimic nature and manage rainfall close to where it falls. Widely considered to be one of the most environmentally friendly forms of drainage system SuDS cause minimal to no long- term detrimental damage. They are often regarded as a sequence of management practices, control structure and statergoes designed to efficiently and sustainable drain surface water, while minimising pollution.

Pumping stations

In-plant pump stations are used to pump flow from areas that are considered too low to drain by gravity into nearby sewer lines. Variable speed pumping is often used to optimise pump performance and minimise power use.

Drainage Engineering Nottingham, Derby, Leicester

At Thomas Bow our professionals provide the highest quality service in drainage systems construction wherever you are in Nottingham, Derby and Leicester.

For a quote on our drainage services and to find out more information send us a message below.

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What are the disadvantages of permeable pavement?

Permeable paving is not ideal for high traffic areas this is because it typically has a lower load-bearing capacity than conventional pavement. Permeable pavement should also not be used for stormwater hotspots with high pollutant loads because stormwater cannot be pretreated prior to infiltration.

How often should drains be maintained?

Even if you don’t notice any specific signs that your drains are having trouble with clogs, you should do your best t have them cleaned at least once a year to maintain an efficient system.

Why should you clean your drainage system?

Regular drainage cleaning is vital in order to reduce the risk of blockages. Over time your drains can experience a buildup from grime or debris. if this build-up is left unchecked it can cause slow drainage, clogged drains or even cracks in the drain itself.