iStock-94980247_edited.jpg

Boundaries

A range of boundary options, including industry standard and regionally specific methods, provide the flexibility to accurately represent water entering and leaving your models

Within each boundary category, Flood Modeller offers an extensive range of options enabling you to tailor your model to your precise requirements and available data. Rainfall data can be converted directly to inflow (optionally with loss through evaporation and/or infiltration), or flow data (e.g. a discharge hydrograph, having performed your own hydrological analysis), or hydrological boundaries providing full rainfall-runoff methodologies. 

You can account for how water enters and leaves your model using flow or water level boundaries. Flow boundaries define the variation of flow with time – most commonly utilised to provide inflows, for example, at the upstream ends of a model. Water level boundaries define the variation of water level with time – most commonly utilised to describe how water leaves the model network.

Boundary options, which represent flows entering and leaving your model, include:

RainfallEvaporationBoundary64.png

Rainfall/Evaporation Boundary

A rainfall and/or evaporation boundary inflow. Rainfall data, evaporation data and infiltration data can all be specified separately and included as part of the inflow. 

FlowTimeBoundary64@2x.png

Flow Time Boundary

Model a discharge hydrograph (specifying flow versus time) as a boundary condition. This unit is ideal for entering flow data after having used your own analysis methods. 

Abstract64@2x.png

Abstraction Unit

Specify flow entering your system based on specified logical rules. It represents a discharge hydrograph without the time aspect needing to be specified.  

FEHBoundary64.png

FEH Boundary

A rainfall-runoff model based on procedures described in the Flood Estimation Handbook (1999).

FRQSIMBoundary64.png

FRQSIM Boundary

Derive an inflow hydrograph using FRQSIM (an abbreviation of 'flood FReQuency SIMulation'), a bespoke, fully distributed rainfall-runoff method. 

FSSR16Boundary64.png

FSSR

A rainfall-runoff model based on the Flood Studies Report (1975) and includes revisions contained in subsequent supplementary reports.

ReFHBoundary64.png

ReFH Boundary

A rainfall-runoff model using procedures developed by CEH to update the FSR/FEH Rainfall Runoff Method. This unit also provides ReFH Urban.

ReFH2Boundary64.png

ReFH2 Boundary

Utilise the Revitalised Flood Hydrograph 2 software to derive an inflow hydrograph for a catchment or sub-catchment and includes the updates within ReFH2.3.

FEHBoundary64.png

FSU

Access extreme rainfall and flood estimation data at both gauged and ungauged locations throughout Ireland. Take outputs from the FSU hydrological portal to use directly in Flood Modeller.

GenericEventRainfallRunoffBoundary64.png

Generic Rainfall-Runoff 

A range of globally applicable hydrological model components. Loss through infiltration can be applied using the Green-Ampt or SCS curve number methods. 

Boundary options, which describe the variation of water levels in your model include:

FlowHeadBoundary64@2x.png

Flow Head Boundary

Represent a flow against stage rating relationship. This boundary condition is also often referred to as a rating curve.

NormalCriticalDepthBoundary64@2x.png

Normal/Critical Depth Boundary

A downstream boundary which automatically generates a flow-head relationship based on section data. Apply normal depth (from Manning's equation), or critical depth. 

HeadTimeBoundary64@2x.png

Head Time Boundary

Input a stage hydrograph (specifying water level versus time) as a boundary condition. 

TidalBoundary64@2x.png

Tidal Harmonics Boundary

Generate water level data utilising numerical methods based upon Admiralty Tide Tables and the constituent harmonics of the tide for a given location and date.