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    • Greenfield runoff rate estimation
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    Here are our tools for the design and evaluation of SuDS

    • Tools
    • Greenfield runoff rate estimation
    • Surface water storage volume estimation
    • Infiltration volume estimation
    • SuDS performance evaluation tool
    • Water quality assessment for SuDS developments (SuDS manual)
    • Water quality assessment for SuDS developments (WaND)
  • Training & support

    We provide SuDS training courses and support for drainage consultants and local planning authorities.

    • Training & support
    • FAQs
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  • SuDS-iQ
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How are flows calculated for the development drainage system?

  • Read more about How are flows calculated for the development drainage system?

How are greenfield runoff rates calculated for steep sites?

  • Read more about How are greenfield runoff rates calculated for steep sites?

How is climate change taken into account?

  • Read more about How is climate change taken into account?

How should you calculate the “greenfield runoff rate” for the site drainage design?

  • Read more about How should you calculate the “greenfield runoff rate” for the site drainage design?

How to obtain SPRHOST value?

  • Read more about How to obtain SPRHOST value?

What are soil HOST classes?

  • Read more about What are soil HOST classes?

What are soil indices?

  • Read more about What are soil indices?

What are the return periods that are relevant to drainage design?

  • Read more about What are the return periods that are relevant to drainage design?

Is there a minimum flow rate that applies to site discharges?

  • Read more about Is there a minimum flow rate that applies to site discharges?

What is "significant public open space", and what is its relevance to the calculation of greenfield runoff rate?

  • Read more about What is "significant public open space", and what is its relevance to the calculation of greenfield runoff rate?

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