We undertake detailed data collation and hydraulic modelling for CDAs to ensure that the flood mechanism is correctly identified and flood risk is properly understood. We will assist LLFAs in setting criteria which can be enforced through planning to reduce flood risks within CDAs as part for re-development, rather than there being no net impact.
We have expertise in developing Integrated Urban Drainage (IUD) models which are fundamental in understanding the complex nature of flood mechanisms at catchment scale particularly where different sources of flood act in combination. Ensuring that the model replicates flow direction, source of flow and how long surface water flooding occurs will provide invaluable confidence in model predictions and enable the development of robust alleviation options.
We understand the importance of community engagement and working with RMAs in obtaining flood accounts and records, which form the basis of establishing a validated model. It is vital that the level of confidence in model prediction is understood prior to making significant capital investment.
On previous projects, we have worked with the Water Authority to gather information including existing hydraulic sewerage models which have been vital in improving our understanding of the catchment.
In addition to traditional alleviation measures we consider SuDS, Green Infrastructure and NFM approaches to reduce the flow rate and volume reaching the flood areas. We will prepare annualised damage estimates using the Multi Coloured Manual (MCM), which are weighed up against option cost estimates. We identify cost effective options which increase the likelihood of FDGiA funding.