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Storm Water

In the UK most Storm Water (surface runoff) is the result of rainfall that runs off from urban surfaces such as roofs, roads and paved areas. It is directly linked to the characteristics of both the rainfall and the catchment.

The study of rainfall is undertaken by Hydrologists who essentially interpret and predict nature, deriving relationships between rainfall properties such as intensity, duration and frequency, to enable the creation of synthetic data sets which can be used when designing Storm Water drainage systems.

Rainfall data for any location within the UK can be obtained from maps associated with the Wallingford Procedure or the Flood Estimation Handbook (FEH).

When designing Storm Water drainage systems consideration must be given to the following:

  • Disposal methods
  • Design storm return period, intensity and duration
  • Contributing area
  • Storm water quality
  • Runoff routes
  • Horizontal layout
  • Integration with existing drainage systems
  • Sewer sizing
  • Vertical layout
  • Storage

Disposal methods are a material planning consideration and most Local Authorities expect Developers to submit proposals that incorporate Sustainable Drainage Systems (SUDS).

MHE can provide advice on both existing and proposed Storm Water drainage systems with professional services ranging from Feasibility Studies through to Outline and Detailed Design. Please contact us to discuss your requirements.