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FEH

The Flood Estimation Handbook Rainfall Runoff Method (FEH) boundary derives an inflow hydrograph from a catchment or sub-catchment, which then becomes a boundary condition equivalent to a Flow Time Boundary (QTBDY). Alternatively, the rainfall component of the FEH Boundary can be used as a direct rainfall boundary (equivalent to a REBDY), when used in conjunction with a Lateral Inflow unit. FEH is based on procedures described in the Flood Estimation Handbook (1999).

ReFH

The Revitalised Flood Hydrograph Rainfall-Runoff (ReFH) boundary derives an inflow hydrograph for a catchment or sub-catchment, which then becomes a boundary condition, equivalent to a Flow Time Boundary, and can therefore form inputs to a hydrodynamic or routing model. This inflow can be applied at the upstream end of a reach or may be distributed over a reach in conjunction with the Lateral Inflow unit.

ReFH2

The 2016 Revitalised Flood Hydrograph Rainfall-Runoff (ReFH2) boundary can derive an inflow hydrograph. It can be applied to both rural and urbanised catchments and can utilise either the FEH 1999 or the FEH 2013 rainfall models. ReFH2 is an updated version of the original ReFH method and was released by Wallingford HydroSolutions (www.hydrosolutions.co.uk) in 2015.

FRQSIM

The FRQSIM (an abbreviation of 'flood FReQuency SIMulation') boundary is a bespoke and fully distributed rainfall-runoff method that is used to derive an inflow hydrograph from a catchment or sub-catchment. FRQSIM will generate flow hydrographs for design return period events derived from the UK Flood Estimation Handbook (FEH) or FRQSIM specific storm profiles, or will simulate runoff during historic events using recorded rainfall and other input data.

FSSR

The FSSR16 boundary derives an inflow hydrograph from a catchment or sub-catchment, becoming a boundary condition equivalent to a Flow Time Boundary (QTBDY). This rainfall-runoff model is based on the UK Flood Studies Report method, which transforms effective rainfall into a runoff hydrograph for the required location. It can simulate design return period events, or runoff during historic events using recorded rainfall and other input data.

Rainfall Evaporation

The Rainfall Evaporation boundary (REBDY) enables you to define an inflow boundary to your model based on any combination of rainfall, evaporation or infiltration data. This unit is useful where direct rainfall or evaporation forms a significant proportion of the water volume entering a system. The boundary unit allows for up to three separate data time series to be specified; representing rainfall, evaporation/evapotranspiration and/or infiltration.

Generic Rainfall/Runoff

The Generic Event Rainfall-Runoff boundary (GERRBDY) enable you to define a hydrological inflow boundary. The unit provides multiple options for each hydrological component within your boundary unit. The currently implemented models focus on the globally-applicable SCS (US Soil Conservation Service) model, the Green-Ampt loss model (an observed rainfall model) and simple constant and recession baseflow models.

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