Lee Catchment Flood Risk Assessment and Management Study

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Identification and assessment of flood risk management options to determine the preferred options

The information gathered, processed and analysed in stage 2 of the project (assessment of flood risk) is being used to develop a list of potential flood risk management options. A decision-making framework has been developed and used to ensure that the assessment of these flood risk management options is evidence-based, transparent, and inclusive of stakeholder and public views.

The flow diagram below shows the different stages in the decision making framework. More information on Stages 1-5 is detailed below. More information on stages 6-8 can be found on the Development of the Catchment Flood Risk Management Plan webpage.

The options identified from this process have been presented at a series of public information days held in May 2009. Feedback recieved at these public information days will be used to inform the development of the Catchment Flood Risk Management Plan.

1. Flood Risk Management Objectives

The catchment-specific flood risk management objectives are integral to this decision-making process. These were identified at the outset of the option development and assessment process and have been refined through stakeholder and public consultation. A total of 15 objectives have been developed for the Lee catchment under four different categories: technical, economic, social and environmental. Each objective has indicators and minimum and aspirational targets.  The indicators include assets such as properties, transport routes, key infrastructure and environmental sites.

2. Establish decision-making criteria

The flood risk management objectives form the basis of the decision making criteria. The decision making criteria has been used to ensure that the flood risk management options fully address flood risk to people, property and the environment and take into account related constraints and opportunities. Different areas of the catchment have different priorities and require different types of flood risk management options.  To ensure the correct focus in each area, the catchment is divided into different areas, called analysis units, which are based around natural sub catchments. Within these sub catchments urban areas are looked at in more detail. 

3. Assess risk

The flood maps have been used to quantify the level of flood risk to indicators in the catchment, i.e. properties, transport routes, key infrastructure and environmental sites. These indicators form the baseline against which the flood risk management options are assessed.

4. Identify measures and options

Potential flood risk management options for both analysis units and urban areas currently at risk of flooding have been selected, using a scoring system, from a range of potential structural and non structural flood risk management measures. Flood risk management options comprise either one or a combination of these measures.

5. Assessment of options

Using a staged assessment process, the 15 objectives were used to assess the identified flood risk management options using a detailed multi-criteria analysis. This multi-criteria analysis is based on a weighting and scoring system to determine the relative performance of each option.

Key Activities

The key activities to the project are

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