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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.

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What is urban creep?

  • Read more about What is urban creep?

What is the ‘total site area’, ‘non-contributing area’ and ‘contributing area’ within the surface water storage volume design tool?

  • Read more about What is the ‘total site area’, ‘non-contributing area’ and ‘contributing area’ within the surface water storage volume design tool?

What are the ‘betterment’ and ‘relaxation’ methods provided for previously developed sites?

  • Read more about What are the ‘betterment’ and ‘relaxation’ methods provided for previously developed sites?

What limiting discharge flow rate should be used for previously developed sites?

  • Read more about What limiting discharge flow rate should be used for previously developed sites?

Does the estimation of the greenfield runoff rate take into account steep sites?

  • Read more about Does the estimation of the greenfield runoff rate take into account steep sites?

How to obtain BFI / BFIHOST value?

  • Read more about How to obtain BFI / BFIHOST value?

How to obtain SPR / SPRHOST value?

  • Read more about How to obtain SPR / SPRHOST value?

What is Qmed and the FEH statistical equation?

  • Read more about What is Qmed and the FEH statistical equation?

What is Qbar and the IH124 formula?

  • Read more about What is Qbar and the IH124 formula?

Why should the total site area (and not just the paved and roof area) be used for estimating the greenfield flow rate?

  • Read more about Why should the total site area (and not just the paved and roof area) be used for estimating the greenfield flow rate?

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