CIRIA has developed a free tool and guidance, BeST (Benefits of SuDS Tool) for use on PCs. It makes assessing the benefits of SuDS easier, without the need for full scale economic inputs.
BeST provides a structured approach to evaluating a wide range of benefits, often based upon the overall drainage system performance. It follows a simple structure, that begins with a screening and qualitative assessment to identify the benefits to evaluate further. Then it provides support to help quantify and monetise each benefit. On completion of the evaluation, the tool provides a series of graphs and charts to present the benefits based on Ecosystem Services (ESS) and Triple Bottom Line (TBL) criteria.
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BeST focuses on the benefits of SuDS, there have been projects and initiatives to capture the costs of SuDS. However, cost information is going to be very context specific depending on the site, the design approach, components and maintenance arrangements. Further information on costs can be found here.
We would be very keen to understand how you found using BeST so we can make any necessary changes. If you have any feedback it would be helpful if you could complete this 10 minute survey here.