What's the problem?
During heavy rainfall, flooding has occurred at numerous locations in Aldershot.
It is likely that a number of factors contribute to the possibility of flooding, so a working solution is likely to require collaboration between the numerous stakeholders responsible for water management in the area.
Work so far
Extensive work has been undertaken to identify key catchment issues including flooding and pollution.
An Integrated Catchment Model has been constructed, which represents the Thames Water sewer network and its interaction with the River Blackwater and other waterbodies such as ponds and drainage ditches.
Asset surveys have been undertaken in key areas, including the survey of manholes, sewers (CCTV), river cross sections, ditches, ponds and the sewage treatment works. The model has been enhanced with this data.
Two flow surveys have been undertaken: a catchment wide survey and a localised flow survey focusing on key areas. Flows in the model have been calibrated against this data. The model has been further calibrated against historical storm events.
The model has been used to quantify risk of flooding to properties in key flooding areas and to determine the mechanism of flooding.
Area of focus
Customer and stakeholder engagement
Since the beginning of the study we've been involved in regular meetings with Councils and operational staff.
An extensive series of customer surveys have been undertaken and the data is being used to enhance and add to the knowledge we already have about the flooding.
If you have been flooded by our public sewer but have not let us know, please download and complete our sewer flooding questionnaire and return to us at the address on the form.
Any information that you provide will be important in understanding the issues within Aldershot and allow us to identify solutions.
A wide range of options are currently being considered for each of the flooding hotspots identified in the catchment. Options are being tested using the Integrated Catchment Model.
The impact of future growth in the catchment is also being investigated and options will be considered to address these impacts.
Our approach throughout this project will be overseen by an Independent Advisory Group which provide the necessary checks and balances to ensure a consistent and correct approach to the study.
The data gathered during the customer surveys is extremely important as it will enable us to understand the root causes of the catchment issues.