Backstone Beck rises in Ilkley Moor and flows in Northerly direction between Ben Rhydding and Ilkley towards its confluence with the River Wharfe.

This dataset consists of triangulated areas and has a number of attributes describing various modelling output parameters such as depth, elevation etc. for each element 20 year, 100 year and 1000 year events are included together with variations for 30% climate change

Typically, river and sewer systems are modelled with tools which are tailored for those purposes. Although the hydraulic processes modelling at the core of the different tools may be similar, the user interfaces, data management systems and hydrological modelling are designed to meet different requirements and reflect the differences in the nature of the different drainage systems. The diversity of the river system and the land use presents a number of choices with respect to the modelling methodology.

The City of Bradford Metropolitan District Council (CBMDC) acquired InfoWorks CS 2D to carry out this type of modelling. This software is accepted by the Environment Agency as being suitable for this type of assessment. The Backstone Beck model is represented by a 1D network of nodes and conduits, the information used to construct the network being obtained from a mixture of historic and contemporary surveys. The 2D surface networks have been created from the 1m horizontal resolution LIDAR data set procured by CBMDC

The hydraulic model is driven by hydrographs generated using the Revitalised Flood Hydrograph (ReFH) method2. Hydrographs were generated at the start of each main branch in the model and at key intermediate points along the length of the model.

Interpretation of outputs

The simulations modelled in InfoWorks use a 1 metre horizontal resolution Digital Elevation Model (DEM), which results in a much higher resolution of detail (including vertical resolution). It is important to remember that the hydrological and hydraulic representations in the modelling are simplifications of reality and that it is important not to place too much emphasis on perceptions of accuracy resulting from the increased resolution.

Disclaimer

Details of the DEM used in the analysis are based upon data supplied under licence to the City of Bradford Metropolitan District Council to assist in the development of appropriate flood risk avoidance, resistance and resilience measures. However, the any user of the data should make appropriate allowances for the hydrological and hydraulic uncertainties inherent within any flood risk assessment.

Caution this dataset is made up of 37 7-Zip files at around 5Gb per file. When uncompressed the whole dataset is around 1.3Tb.

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