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«Sustainable Water Management in the City of the Future Integrated Project Global Change and Ecosystems DELIVERABLE 2.3.2a: A GIS DATA INTEGRATION ...»

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018530 - SWITCH

Sustainable Water Management in the City of the Future

Integrated Project

Global Change and Ecosystems

DELIVERABLE 2.3.2a: A GIS DATA INTEGRATION TOOL FOR

ASSESSING STORMWATER MANAGEMENT OPTIONS: USER

GUIDE

Due date of deliverable: January 2009

Actual submission date: June 2009

Start date of project: 1 February 2006 Duration: 60 months

Organisation name of lead contractor for this deliverable: Middlesex University Prepared by Christophe Viavattene, Middlesex University Revision: Final Project co-funded by the European Commission within the Sixth Framework Programme (2002-2006) Dissemination Level Public PU PU Restricted to other programme participants (including the Commission Services) PP Restricted to a group specified by the consortium (including the Commission Services) RE Confidential, only for members of the consortium (including the Commission Services) CO SWITCH Deliverable Briefing Note Template SWITCH Document

A GIS Data Integration Tool for Assessing Stormwater Management Options:

User Guide (Deliverable 2.3.2a).

Audience This deliverable describes a stormwater decision support (DSS) tool designed to assist practitioners (drainage engineers, urban decision-makers, private developers, city planners, water managers, environmental legislators/regulators, environmental modelers) in the selection and location of BMPs for a defined catchment area. The tool will be initially applied and tested by the Birmingham Learning Alliance and to the Birmingham Eastside development area. It is also aimed at the wider SWITCH consortium, specifically those with an interest in stormwater management in the Demonstration cities.

Purpose The purpose of the user guide is to describe the structure of a GIS model, which has been developed to assist in the identification and location of sites within a catchment that are appropriate for the installation of stormwater BMPs for the control of wet weather flow and associated water quality. The presented report directs the user through the different stages and use of the tool and highlights how the benefits can be best achieved.

Background The user guide is organized into the following sections which initially outline the operating principles of the GIS-based tool and then instruct the user on how to derive the optimum information regarding the identification and location of BMPs.

• Introduction

• Procedure for downloading the program

• File requirements

–  –  –

The ‘user-friendly interface’ identifies the important operational components of the

tool and is divided into the following sections:

1. Project properties

2. Symbology

3. Unit operation process and pollutant removal

4. Multi-criteria analysis (MCC)

5. Site criteria

6. Potential areas (for BMP location)

7. Site by site analysis

8. Add stormwater BMP The ‘Project properties’ and the ‘Symbology’ interfaces allow the user to effectively manage the current project. The ‘Parameter’ interfaces (3, 4 and 5) relate to the unit operating processes within the BMPs, the pollutant removal potentials, the scores within the multi-criteria analysis, and/or the site characteristics) and allow the user to change values which influence the decision process within the tool. Finally, there are three interactive interfaces identified as ‘Potential areas’, ‘Site-by-site’ and ‘Add stormwater BMP’ which can be used to assess potential BMPs appropriate for a site.

By addressing a range of site characteristics (such as soil type and depth to groundwater) the tool identifies those sites where a selected BMP could be feasibly installed. Alternatively, individual sites can be examined sequentially to determine which BMPs are practicable at that location. The derived list of BMPs can be further discriminated in terms of either pollutant removal ability or by consideration of a range of influencing criteria. These criteria are described within the tool by a series of indicators relating to technical, environmental, operation and maintenance, social and community, economic, and legal and urban planning factors which are assessed using a multi-criteria analysis approach. The pollutant removal capabilities of the BMPs are assessed through a scoring system which combines a consideration of the unit operating processes within BMPs with the behaviour of different pollutants towards these processes.

Potential Impact

The GIS-based tool works in two directions by matching BMPs to sites and by indicating which BMPs are feasible at an identified site. The additional capacity to consider the pollutant removal capability of a BMP as well as its scientific, social, economic, operational and planning requirements makes this a powerful tool for practitioners involved in either designing a new urban drainage system or retrofitting an existing one. It is particularly appropriate for analysis of the mitigating controls required for extreme event conditions.

Issues

The GIS-based methodology provides an integrated, sub-catchment/site planning approach to offer a high sustainability ethos for high density urbanization. The presented report is designed as a guide to highlight how the benefits of the tool can be best achieved. If the user of the tool has a particular preference for a specific BMP, the tool can search for sites where this BMP could be installed by dragging an icon across the search area. When a positive match is found, the characteristics of the site are displayed. It is possible to amend some of these characteristics to assess the impact on BMP selection.





Recommendations

The developed tool has the capability of identifying and locating those sites within a catchment where a particular BMP could be installed or, for a particular site, it can identify the different BMPs which are feasible. Where several BMPs are possible, they can be compared in terms of pollutant removal capacity or through a range of technical and non-technical criteria and indicators. Currently, within the SWITCH project, the tool is being linked with the STORM model. This will provide a more fully comprehensive approach to the prediction of the stormwater attenuation benefits which can be achieved by incorporating appropriately designed and positioned BMPs into a conventional urban drainage system. Stormwater practitioners will be able to use the extended tool to assist with the design of new drainage systems or the retro-fitting of existing systems involving the incorporation of BMPs for the control of extreme event flooding.

Table of Contents

Summary

1. Introduction

2. Procedure for downloading the program

3. File requirements

3.1. Shapefiles

–  –  –

3.2. Text files

3.2.1. Field criteria

3.2.2. Site criteria

–  –  –

3.2.4. Performance matrix

4. Launching the Tool

5. The GIS interface

6. The user-friendly interface

6.1. Project properties

6.2. Symbology

–  –  –

6.4. MCC criteria

6.5. Site criteria

6.6. Potential areas

6.7. Site by site

6.8. Add stormwater BMP

7. Conclusion

8. References

–  –  –

Figure 1: Example of stormwater BMP location within the database

Figure 2: Examples of field criteria relationships

Figure 3: The opening window of the stormwater BMP DSS tool

Figure 4: The GIS interface screen in the stormwater BMP DSS tool

Figure 5: Details of the ‘Project properties’ interface screen

Figure 6: Details of the ‘Symbology interface’ screen

Figure 7: Details of the ‘Unit Operational Process interface’ screen

Figure 8: Details of the ‘Pollutant Removal interface’ screen

Figure 9: Details of the ‘MCC Criteria interface’ screen

Figure 10: Details of the ‘Site Criteria interface’ screen

Figure 11: Details of the ‘Potential Areas interface’ screen

Figure 12: Details of the ‘Site by site interface’ screen

Figure 13: Details of the ‘Add BMP interface’ screen

Figure 14: Dialog box linked to ‘Add BMP interface’ screen enabling ………… 23 BMP attributes to be changed.

Summary This deliverable, which has been developed in WP2.3 of the SWITCH project, describes the operating structure of a decision support (DSS) tool designed to assist practitioners in the selection of stormwater BMPs for a defined catchment area. The objective of the task associated with this deliverable was to develop a GIS-based model with the capacity to identify sites within a catchment which are appropriate for the installation of stormwater BMPs. In addition, it was planned to identify the most relevant type of BMP for use at a particular site in relation to site-specific conditions, such as soil type and depth to groundwater. By addressing a range of site characteristics the tool identifies those sites where a selected BMP could be feasibly installed. Alternatively, individual sites can be examined sequentially to determine which BMPs are practicable at that location. The derived list of BMPs can be further discriminated in terms of either pollutant removal capability or by consideration of a range of influencing criteria. These criteria are described within the tool by a series of indicators relating to technical, environmental, operation and maintenance, social and community, economic, and legal and urban planning factors which are assessed using a multi-criteria analysis approach. The pollutant removal capabilities of the BMPs are assessed through a scoring system which combines a consideration of the unit operating processes (OUPs) within BMPs with the behaviour of different pollutants towards these processes.

If the user of the tool has a particular preference for a specific BMP, the tool can search for sites where this BMP could be installed by dragging an icon across the search area. When a positive match is found, the characteristics of the site are displayed. It is possible to amend some of these characteristics to assess the impact on BMP selection.

The presented report is designed as a guide to highlight how the benefits of the tool can be best achieved. Because of current licence requirements associated with the GIS component of the tool it can only be made available to members of the SWITCH consortium on request.

The tool works in two directions by matching BMPs to sites and by indicating which BMPs are feasible at an identified site. The additional capacity to consider the pollutant removal capability of a BMP as well as its scientific, social, economic, operational and planning requirements makes this a powerful tool for practitioners involved in either designing a new urban drainage system or retro-fitting an existing one.

1. Introduction The contribution that stormwater BMPs (also known as Sustainable Urban Drainage Systems ;

SUDS) can make to sustainable urban development through their potential to address the needs and concerns of a diverse group of stakeholders, has been widely recognised (Revitt et al., 2008). These systems include a wide range of structures having different impacts in terms of water quantity and quality, posing different technical constraints and entailing variable costs. However, unfamiliarity with these techniques, and in many cases, the lack of technical knowledge held by stakeholders, could influence the decision-making process when selecting appropriate systems.

Urban stormwater models such as SWMM, MIKE II, MOUSE, Hydroworks or STORM (for a review of these models see Balmforth et al., 2006; Elliott et al., 2007; Ellis et al., 2008) are now widely used to assess the impact of control devices on the urban drainage system. Such models provide a good representation of the physical and hydraulic phenomena but, because of their complexity, they are usually non-user friendly and are generally limited to technical issues (Balmforth et al., 2006).



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