ADAPT-A Drainage Analysis Planning Tool

Abstract

HR Wallingford are a partner in the EU funded TRUST project. They are involved in Work package 4.3 Wastewater and stormwater systems, to produce a model and report on a system sustainability analysis and potential for improvements for stormwater systems as Deliverable 4.3.2. This report is deliverable 4.3.2. It details the development of the tool ADAPT (A Drainage Analysis and Planning Tool). The objective of the tool is to evaluate the improvement requirements to a stormwater system in order to achieve a sustainable performance in serving the community with minimal impact on the environment. The tool is based on the use of optimisation of a range of possible options to achieve a stated set of performance criteria. Improvements to the drainage system can be effected by either making changes to the network assets (pipes and storage tanks), and removal or modification of the runoff from paved surfaces. The tool has been applied to the small steep catchment of Hoffselva in Oslo. The catchment has problems associated with both flooding (58 known basement locations) and pollution in the two small watercourses from 21 overflows from the combined sewer system. An Infoworks CS model has been built (10km2 and 2200 pipes) and verified, before being used to analyse the system behaviour and evaluate options for meeting performance requirements. The results demonstrate how the performance requirements might be achieved and confirms the capabilities and effectiveness of the tool. The deliverable is complete in as much as it demonstrates the tool exists and works. However development is on-going and this deliverable will be updated at the end of the project. The report is detailed in two parts in the main section; the development of ADAPT, and then its application in analysing the pilot study area. This is followed by appendices which provide supporting information.