- 21 Oct 2022
- 3 Minutes to read
Hydraulic Units Modelling Components
- Updated on 21 Oct 2022
- 3 Minutes to read
Flood Modeller model networks are built up from a series of individual 'building blocks' known as hydraulic units. Each unit represents a particular hydraulic attribute of the modelled network, e.g. a river section, a junction or a weir.
The icon associated to each unit is used in the following places within the Flood Modeller 1D Interface:
- Buttons on the 1D Build toolbar - the Flood Modeller interface contains multiple banks of toolbar buttons. The majority of these are used to add new hydraulic units to a model. Each of these buttons display the icon that corresponds to the unit type that will be added
- Network Panel - each unit added to a model will appear with the associated icon displayed adjacent to the given node name.
- Map View - when a model is visualised the network is defined by the linking of appropriate hydraulic unit icons.
The following section lists the available units that can be utilised when constructing a model, together with a brief definition and links to more detailed descriptions.
Hydraulic Unit Icons
Flow Time Boundary
Inserts a Flow Time Boundary Unit.
Flow Head Boundary
Inserts a Flow Head Boundary Unit.
Head Time Boundary
Inserts a Head Time Boundary Unit.
Normal / Critical Depth Boundary
NCDBDY unit generates a downstream flow-head relationship based on section data
US SCS Hydrograph
Inserts a US Soil Conservation Service Boundary Hydrograph Unit.
Inserts a Flood Studies Supplementary Report 16 Boundary Hydrograph Unit.
Inserts a Flood Estimation Handbook Boundary Hydrograph Unit.
Rainfall / Evaporation Boundary
REBDY unit provides a rainfall and/or evaporation boundary inflow into a model network
FRQSIM unit provides a bespoke, fully distributed rainfall-runoff method to generate an inflow hydrograph for a catchment or sub-catchment
ReFHBDY unit is an alternative method (to FEH) to derive an inflow hydrograph for a catchment or sub-catchment.
Inserts an Abstraction Unit.
Inserts a Rating Curve Unit.
Enables specification of abstraction rules to define an irrigation system
Gauge units can be applied to real-time forecasting applications where there is a need to improve existing models in real time by an updating process
Inserts a Culvert Bend Unit.
Inserts a Culvert Outlet Unit.
Inserts a Culvert Inlet Unit.
Inserts a Tidal Harmonics Boundary Unit.
Inserts a Notional Weir Unit.
Inserts a Open Channel Pump Unit.
Round Nosed Broad Crested Weir
Inserts a Round Nosed Broad Crested Weir Unit.
General Purpose Weir
Inserts a General Purpose Weir Unit.
Sharp Crested Weir
Inserts a Sharp Crested Weir Unit.
Inserts a Gated Weir Unit.
Inserts a Vertical Sluice Gate Unit.
Inserts a Radial Sluice Gate Unit.
Bridge (USBPR 1978)
Inserts a USBPR Bridge Unit.
Inserts an Arch Bridge Unit.
Inserts a Pier Loss Bridge Unit.
Inserts an Orifice Unit.
Inserts an Inverted Syphon Unit (same as Orifice Unit).
Inserts an Outfall Unit (same as Orifice Unit).
Flood Relief Arch
Inserts a Flood Relief Arch Unit (same as Orifice Unit).
Inserts a Bernoulli Loss Unit.
General Head Loss
Inserts a General Head Loss Unit.
Represents a channel blockage using the proportion of the flow area obstructed.
Flow Head Control
Inserts a Flow Head Control Unit.
Inserts a Crump Weir Unit.
Inserts a Flat V weir. This is a long-based weir with a triangular longitudinal profile and a transverse symmetrical V-shaped crest having small side-slopes (common in UK).
Inserts a Syphon Spillway Unit.
Inserts a River Section Unit.
CES Section uses the Depth-Integrated Reynolds-Averaged Navier-Stokes Method to calculate conveyance for a River Section.
Inserts an Interpolate Unit.
Inserts a Replicate Unit.
Inserts a Symmetrical Conduit Unit.
Inserts an Asymmetrical Conduit Unit.
Full Arch Conduit
Inserts a Full Arch Conduit Unit.
Sprung Arch Conduit
Inserts a Sprung Arch Conduit Unit.
Inserts a Rectangular Conduit Unit..
Inserts a Circular Conduit Unit.
Inserts a Muskingum Unit.
Inserts a Variable Parameter Muskingum Cunge Cross Section Unit.
Inserts a Variable Parameter Muskingum Cunge Routing Unit.
Inserts a Variable Parameter Muskingum Cunge Routing Section Unit.
Inserts a Junction Unit.
Whereas the Open Junction unit equalises water levels at the junction, the Total Energy Junction equalises the total energy head at all nodes
Simulates discharge through a manhole from a surcharged culvert
Inserts a Comment Unit.
Models the effects of wind shear on open-channel sections, which may be of particular significance in wide rivers and estuaries.
Inserts a Spill Unit.
Flood Plain Section
Inserts a Floodplain Section Unit.
Inserts a Reservoir Unit.
Inserts a Pond Unit.
Lateral Inflow unit distributes total inflow from a boundary between across multiple river reaches or reservoirs. Inputs can be divided according to reach length, surface area or user specified proportions.