MIKE 11 FEH is a comprehensive modelling tool for analysing catchment runoff and carrying out flood risk assessments using the methods published in the UK Flood Estimation Handbook. MIKE 11 FEH can be used by engineers, planners, developers, local government and regulatory authorities to assess the response of runoff to rainfall in rural and semi-urban catchments in the UK.

With MIKE 11 FEH you can:

• Generate discharge hydrographs using the FEH (Vol. 4) methodology
• Use a range of flow routing methods
• Design and assess the effects of bridges, culverts, embankments, storage reservoirs and channel improvements
• Perform flood risk analyses
• Generate plots, tables and flood maps

Developed with CEH Wallingford

The Flood Estimation Handbook, published by the Institute of Hydrology (now CEH Wallingford) in 1999, largely supersedes the earlier Flood Studies Report (FSR), and includes a range of innovations to simplify flood flow estimation in the UK. A digital catchment map covering mainland UK forms the basis for the new procedures. MIKE 11 FEH, which has been developed in collaboration with CEH Wallingford, incorporates the FEH methodology. Further details of FEH are available on the FEH home page.
Features

MIKE 11 FEH comprises two separate modules within a fully integrated package. An FEH rainfall-runoff module is used to generate hydrographs. This is coupled to a special version of the MIKE 11 HD module, a fully dynamic river modelling system, for routing the hydrograph through downstream river reaches.

The FEH module incorporates the methods presented in Volume 4 of the Handbook for:

• T-Year flood estimation using the rainfall-runoff method
• Probable Maximum Floods (PMF)
• Recreating observed flood events

MIKE 11 FEH guides the user through each step in the flood estimation process via an intuitive user interface. The generated hydrographs can be used directly with the MIKE 11 HD river modelling system, or exported to text files or standard Office applications. Click on the thumbnails below to view details.

Hydrograph Generation

MIKE 11 FEH offers a number of options for hydrograph generation based on FEH methods. Inputs can be specified from:

• Catchment descriptors exported from the FEH CD-ROM
• Observed or user defined values
• Donor catchments

The FEH module will simultaneously compute a series of hydrographs for a range of return periods, or alternatively generate PMF or observed events. More than one FEH catchment can be included in a single simulation. T-year events may be scaled against observations or peak estimates obtained from WINFAP-FEH analyses.

Fully Dynamic River Routing

MIKE 11 FEH comes complete with the proven MIKE 11 HD river modelling system for routing of the generated runoff hydrographs. MIKE 11 HD is a fully dynamic routing method, allowing the most complex hydraulic situations to be accurately modelled - such as river flooding, tidal and backwater effects. A wide range of structures can be modelled, including weirs, culverts, bridges, pumps, sluice and radial gates etc.

MIKE 11 FEH Packages

MIKE 11 FEH comes in two forms - bundled together with a 75 gridpoint version of the MIKE 11 HD hydrodynamic river routing model, or as an add-on module for existing MIKE 11 HD users. Both packages are competitively priced. Please contact DHI UK for full technical specifications and prices.

Applicability

The Flood Estimation Handbook presents two approaches to flood frequency estimation: one based on statistical analysis of flood peak data (Vol 3) and the other based on the FSR rainfall-runoff method (Vol 4). MIKE 11 FEH is based on the rainfall-runoff method. For statistical analysis, the WINFAP-FEH software is required, and is available from CEH Wallingford. Both methods require the FEH CD-ROM, which contains rainfall and catchment data in digital form for the mainland UK.

The statistical method provides a single point estimate of flood discharge. It is the preferred method where gauged data are available at or near the site under consideration.

The rainfall-runoff method encapsulated in MIKE 11 FEH provides a design hydrograph. It is preferred where storage routing is involved. It is also recommend where the incremental effects of urban developments are to be investigated. For catchment areas which are more than 50% urbanised, the FEH methodology is not recommended, as it is likely that stormwater drainage systems will be used to drain surface runoff. In such cases, our urban drainage modelling system MOUSE is recommended.