Servicio de Información Comunitario sobre Investigación y Desarrollo - CORDIS

FP5

DAYWATER Informe resumido

Project ID: EVK1-CT-2002-00111
Financiado con arreglo a: FP5-EESD
País: United Kingdom

BMP multi-criteria comparator (MCC)

The multi-criteria comparator (MCC), contained within the DayWater ADSS, is an electronic version of the multi-criteria analysis technique which has been specifically designed to support stakeholders in identifying the most appropriate type of structural Best Management Practice (BMP) for a particular site. Currently, the multi-criteria approach is only applicable to individual stand-alone BMP devices i.e it does not consider hybrid or treatment train applications and it assumes a mixed land use catchment.

In the MCC performance matrix, the possible solutions are a range of BMPs (the potential use of 15 different structural BMP systems may be evaluated), and the seven criteria against which each of the BMPs are evaluated are categorised as Technical, Environmental, Operation and Maintenance, Social and Urban Community Benefits, Economic Costs and Legal and Urban Planning. Each criterion is supported by a series of key performance indicators (KPIs) comprising diagnostic states or conditions which describe relevant and appropriate properties of the given criteria.

Indicators essentially account for the changes in a driver-pressure, impact-response system and provide a comparative basis to decide when and whether the criteria have been satisfactorily addressed. The KPIs provide more detailed discriminators (e.g. flood storage, pollution control and system flexibility for the Technical criteria), and are benchmarked by threshold values (qualitative or quantitative) which can comprise a point of reference for decision-making. The criteria and KPIs were selected following extended DayWater enduser consultation.

The MCC can be operated in 3 modes which involve either the use of default scores (Mode 1), the development of scores by the end-user Mode 2), or the refinement of an initial order of preference by introducing new scores for the initially generated BMP options (Mode 3). The different modes of operation support stakeholders who are new to urban stormwater management through the provision of default scores derived from the utility plot procedure (i.e. Mode 1), as well as offering a useful tool to those with more experience by enabling them to generate their own values using site-specific characteristics (i.e. Mode 2). The use of Mode 3 is a combination of Modes 1 and 2, enabling a robust shortlist of BMP options to be generated for which further site-specific information can be gathered as required, effectively enabling data collection which needs to be identified and completed in a targeted manner.

The initial stage of the MCC program involves a site screening procedure where the entry of site specific data relating to depth to groundwater and information on either the soil hydraulic conductivity, soil type or infiltration rate, together with more general information on the size of the contributing catchment area is requested. This process automatically warns the user regarding those BMPs which are not appropriate for use due to site-specific conditions e.g. the appearance of a red colour indicates that a BMP should not be used and an orange colouration advises the user that a particular BMP should not be used in isolation because of the size of the contributing catchment area.

Using the MCC performance matrix, the user is required to allocate weightings at the criterion and/or indicator level to reflect their particular concerns or to address site-specific issues. The actual MCC process involves combining the allocated scores and weightings by calculating the sum of each score x weighting value for each indicator for each BMP. This enables an Order of Preference to be produced in which the BMP-specific summed values are ranked from highest to lowest, effectively generating an order of preference for the use of BMPs at a particular site.

The MCC can support urban stormwater stakeholders, both directly and indirectly, in a variety of different ways. The performance matrix provides a decision-making framework within which the application of benchmarked scores enables a large amount of complex information to be handled in a consistent way. In addition, the inclusion of descriptions relating to the development of the default scores (both as short simplified summaries and more detailed pdf documents), provides stakeholders with a comprehensive source of information and explanation about each indicator and facilitates discussions in areas in which not all stakeholders may be familiar.

The MCC methodology provides a simple, robust and readily-understandable procedure that can be appropriately applied to the evaluation of selection criteria of alternative stormwater source control technologies as a means of identifying preferred solutions. The procedure is flexible and amenable to a variety of stakeholder and institutional interests with the methodology primarily intended to provide guidance for stakeholders within the context of a participatory negotiation and learning process.

Reported by

Middlesex University
Queensway
EN3 4SA Enfield
United Kingdom
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