View source for Process representation across tools


''' PAGE IN PROGRESS - MORE COMING SOON! '''

building process representation overview tables + links to more specific pages about individual processes
</br>

== Canopy interception and evaporation (vs throughfall) ==
{| class="wikitable"
! scope="col" width:10%"|  Algorithm <br/>description
! scope="col" style="background: #F2CEE0; width:18%" |WRSM-Pitman
! scope="col" style="background: #F2D4CE; width:18%" |SPATSIM-Pitman
! scope="col" style="background: #CEF2CE; width:18%" |ACRU4
! scope="col" style="background: #F2F2CE; width:18%" |SWAT2012
! scope="col" style="background: #CEE6F2; width:18%" |MIKE-SHE,<br/>[[Coverage of structural options within modelling tools#MIKE-SHE|semi-distributed &<br/> fully distributed]]
|-
| style="vertical-align: top" |<br/>'''Algorithm <br/>inputs''' <br/>''(input data,<br/>parameters,<br/>model-calculated<br/>states/storages)''
| style="background: #FFF5FA; vertical-align: top" |
<br/>
* Rain
* '''''Cover properties:'''''
** max interception 
<br/>
| style="background: #FFF7F5; vertical-align: top" |
<br/>
* Rain
* '''''Cover properties:'''''
** max interception 
<br/>
| style="background: #F5FFF5; vertical-align: top" |
<br/>
* Rain
* PET
* Canopy storage ''(state)'' 
* '''''Cover properties:'''''
** max interception (OR LAI)
<br/>
| style="background: #FFFFF5; vertical-align: top"; rowspan= "3" |
<br/>'''Canopy interception is not explicitly modelled when using daily timestep modelling.''' <br/>
''It is implicitly considered in the ‘initial abstraction’, see infiltration & surface runoff below''
| style="background: #F5FCFF; vertical-align: top" |
<br/>
* Rain
* PET
* Canopy storage ''(state)''
* '''''Cover properties:'''''
**LAI
**canopy interception coefficient
<br/>
|-
| style="vertical-align: top" |'''Function <br/>type'''
| style="background: #FFF5FA; vertical-align: top" |exponential & threshold
| style="background: #FFF7F5; vertical-align: top" |exponential & threshold
| style="background: #F5FFF5; vertical-align: top" |threshold
| style="background: #F5FCFF; vertical-align: top" |threshold
|-
| style="vertical-align: top" |'''Thresholds'''
| style="background: #FFF5FA; vertical-align: top" |
'''yes:'''
<br/>
timestep interception capacity ''(calculated)''
| style="background: #FFF7F5; vertical-align: top" |
'''yes:''' 
<br/>
timestep interception capacity ''(calculated)''
| style="background: #F5FFF5; vertical-align: top" |
'''yes:'''  
<br/>
timestep interception capacity ''(calculated)''
| style="background: #F5FCFF; vertical-align: top" |
'''yes:''' 
<br/>
timestep interception capacity ''(calculated)'' 
|}
</br>

== Infiltration into soil moisture (vs surface runoff or surface ponding) ==
'''Note:''' This excludes the case of a modelling unit (HRU, grid cell, area within a subcatchment, etc.) is designated as '''''impervious'''''. In this case, rain inputs would become surface runoff, potentially with a portion staying behind as surface storage/ponding if the area has attenuation specified (to represent roughness and flatness).
{| class="wikitable"
! scope="col" style="width:10%" | Algorithm <br/>description
! scope="col" style="background: #F2CEE0; width:15%" |WRSM-Pitman 
! scope="col" style="background: #F2D4CE; width:15%" |SPATSIM-Pitman 
! scope="col" style="background: #CEF2CE; width:15%" |ACRU4
! scope="col" style="background: #F2F2CE; width:15%" |SWAT2012
! scope="col" style="background: #CEE6F2; width:15%" |MIKE-SHE,</br>[[Coverage of structural options within modelling tools#MIKE-SHE|semi-distributed, </br>more conceptual]]
! scope="col" style="background: #CEDAF2; width:15%" |MIKE-SHE,</br>[[Coverage of structural options within modelling tools#MIKE-SHE|fully-distributed, </br>more physical]]
|-
| style="vertical-align: top" |<br/>'''Algorithm <br/>inputs''' <br/>''(input data,<br/>parameters,<br/>model-calculated<br/>states/storages)''
| style="background: #FFF5FA; vertical-align: top" |
<br/>
* Rain
* Rainfall distribution factor
* Soil moisture ''(state)'' 
* '''''Soil properties:'''''
** Saturation soil moisture
** Infiltration rate distribution (min, max)
<br/>
| style="background: #FFF7F5; vertical-align: top" |
<br/>
* Rain
* Rainfall distribution factor
* Soil moisture ''(state)'' 
* '''''Soil properties:'''''
** Saturation soil moisture
** Infiltration rate distribution (min, max)
<br/>
| style="background: #F5FFF5; vertical-align: top" |
<br/>
* Throughfall (rain-interception)
* Soil moisture within "infiltration depth"''(state)'' 
* '''''Soil properties:'''''
** Saturation soil moisture
** "Infiltration depth" parameter
** Macropore by-pass (clay cracking)
<br/>
| style="background: #FFFFF5; vertical-align: top"|
<br/>
* Throughfall (rain-interception)
* Soil moisture ''(state)'' 
* '''''Soil properties:'''''
** Saturation soil moisture
** Curve number (SCS-CN)
** Macropore by-pass
<br/>
| style="background: #F5FCFF; vertical-align: top" |
<br/>
* Throughfall (rain-interception)
* Soil moisture ''(state)'' 
* '''''Soil properties:'''''
** Saturation soil moisture
** Saturated hydraulic conductivity (K<small>sat</small>),
** Macropore by-pass
<br/>
| style="background: #F5F8FF; vertical-align: top" |
<br/>
* Throughfall (rain-interception)
* Soil moisture ''(state)'' 
* '''''Soil properties:'''''
** Saturation soil moisture
** Soil moisture retention curve
** Saturated hydraulic conductivity (K<small>sat</small>),
** Macropore by-pass
<br/>
|-
| style="vertical-align: top" |'''Function <br/>type'''
| style="background: #FFF5FA; vertical-align: top" |non-linear & threshold
| style="background: #FFF7F5; vertical-align: top" |non-linear & threshold
| style="background: #F5FFF5; vertical-align: top" |power & threshold
| style="background: #FFFFF5; vertical-align: top" |power & threshold
| style="background: #F5FCFF; vertical-align: top" |linear (rate) & threshold
| style="background: #F5F8FF; vertical-align: top" |non-linear & threshold
|-
| style="vertical-align: top" |'''Thresholds'''
| style="background: #FFF5FA; vertical-align: top" |
'''yes:'''
<br/>Max infiltration rate,
<br/>Saturation soil moisture* 
<br/> <small>*Saturation excess becomes interflow, not surface runoff</small>
| style="background: #FFF7F5; vertical-align: top" |
'''yes:'''
<br/>Max infiltration rate,
<br/>Saturation soil moisture* 
<br/> <small>*Saturation excess becomes interflow, not surface runoff</small>
| style="background: #F5FFF5; vertical-align: top" |
'''yes:'''
<br/>Saturation soil moisture*
<br/> <small>*Fraction of saturation excess becomes "delayed flow"~interflow, not "quickflow"~surface runoff</small>
| style="background: #FFFFF5; vertical-align: top"|
'''yes:'''
<br/>Max infiltration rate ''(calculated),''
<br/>Saturation soil moisture
| style="background: #F5FCFF; vertical-align: top" |
'''yes:'''
<br/>Max infiltration rate (uses K<small>sat</small>),
<br/>Saturation soil moisture 
| style="background: #F5F8FF; vertical-align: top" |
'''yes:'''
<br/>Max infiltration rate ''(calculated)'',
<br/>Saturation soil moisture 
|}
</br>

== Surface runoff to channel network ==
'''Note on surface runoff vs ponding and surface storage:''' In the Pitman models, all water not calculated to infiltrate in a timestep, which is a month, is assumed to be runoff. For models with shorter timesteps, water reaching the land surface which does not infiltrate into soil in a timestep can become surface runoff or remain as surface ponding/surface storage. In subsequent model timesteps, water still on the land surface can evaporate, infiltrate, and/or become surface runoff in the next timestep. Some models have relatively short timesteps (subdaily, daily) compared to the rate at which water would move all the way across a modelled land unit (which could be large, rough, and/or flat, slowing the flow rate). This is why some water will be 'surface storage' in one timestep and then 'surface runoff' in the next timestep. MIKE-SHE can also consider that land surfaces can be very rough, or have dips that trap water, and so some amount surface water will not be able to run off at all (detention storage). This water will both evaporate and infiltrate over time. 
</br> ACRU4 differs notably, assuming the water that does not infiltrate into soil accounts for both surface runoff and interflow runoff.  
{| class="wikitable"
! scope="col" style="width:10%" | Algorithm <br/>description
! scope="col" style="background: #F2CEE0; width:15%" |WRSM-Pitman 
! scope="col" style="background: #F2D4CE; width:15%" |SPATSIM-Pitman 
! scope="col" style="background: #CEF2CE; width:15%" |ACRU4
! scope="col" style="background: #F2F2CE; width:15%" |SWAT2012
! scope="col" style="background: #CEE6F2; width:15%" |MIKE-SHE,</br>[[Coverage of structural options within modelling tools#MIKE-SHE|semi-distributed, </br>more conceptual]]
! scope="col" style="background: #CEDAF2; width:15%" |MIKE-SHE,</br>[[Coverage of structural options within modelling tools#MIKE-SHE|fully-distributed, </br>more physical]]
|-
| style="vertical-align: top" |<br/>'''Algorithm <br/>inputs''' <br/>''(input data,<br/>parameters,<br/>model-calculated<br/>states/storages)''
| style="background: #FFF5FA; vertical-align: top" |
<br/>
* Surface water present* ''(state)''
<br/>
<small> *Month timestep: all water not infiltrating becomes runoff </small> 
<br/>
| style="background: #FFF7F5; vertical-align: top" |
<br/>
* Surface water present* ''(state)''
<br/>
<small> *Month timestep: all water not infiltrating becomes runoff </small> 
<br/>
| style="background: #F5FFF5; vertical-align: top" |
<br/>
* Surface water present* ''(state)''
* Lag coefficient*
<br/>
<small> *Lag coefficient separates "quickflow"~surface runoff from "delayed-flow"~interflow. Quickflow portion reaches the channel on the same day generated (rain day). The rest is lagged over subsequent days </small> 
| style="background: #FFFFF5; vertical-align: top"|
<br/>
* Surface water present* ''(state)''
* '''''Surface path properties:'''''
** Path length
** Path slope
** Path roughness (Manning's n)
<br/>
| style="background: #F5FCFF; vertical-align: top" |
<br/>
* Surface water present* ''(state)''
* '''''Surface path properties:'''''
** Detention storage
** Path length
** Path slope
** Path roughness (Manning's n)
<br/>
| style="background: #F5F8FF; vertical-align: top" |
<br/>
* Surface water present* ''(state)''
* '''''Surface path properties:'''''
** Detention storage
** Path length (from gridded topography)
** Path slope(from gridded topography)
** Path roughness (Manning's n)
<br/>
|-
| style="vertical-align: top" |'''Function <br/>type'''
| style="background: #FFF5FA; vertical-align: top" |(no transformation)
| style="background: #FFF7F5; vertical-align: top" |(no transformation)
| style="background: #F5FFF5; vertical-align: top" |(no transformation)
| style="background: #FFFFF5; vertical-align: top" |non-linear
| style="background: #F5FCFF; vertical-align: top" |non-linear & threshold
| style="background: #F5F8FF; vertical-align: top" |non-linear & threshold
|-
| style="vertical-align: top" |'''Thresholds'''
| style="background: #FFF5FA; vertical-align: top" |
no*
<br/><small> *none after infiltration has been calculated </small> 
| style="background: #FFF7F5; vertical-align: top" |
no*
<br/><small> *none after infiltration has been calculated </small> 
| style="background: #F5FFF5; vertical-align: top" |
no*
<br/><small> *none after infiltration has been calculated </small> 
| style="background: #FFFFF5; vertical-align: top"|
no*
<br/><small> *none after infiltration has been calculated </small> 
| style="background: #F5FCFF; vertical-align: top" |
'''yes:'''
<br/>Detention storage
| style="background: #F5F8FF; vertical-align: top" |
'''yes:'''
<br/>Detention storage
|}
</br>

== Evapotranspiration (ET) from soil moisture (SM) ==
'''Note: More coverage of evapotranspiration related terminology and inputs across different tools can be found [[Terminology#Evapotranspiration terms across tools|here]]'''
{| class="wikitable"
! scope="col" style="width:10%" | Algorithm <br/>description
! scope="col" style="background: #F2CEE0; width:15%" |WRSM-Pitman 
! scope="col" style="background: #F2D4CE; width:15%" |SPATSIM-Pitman 
! scope="col" style="background: #CEF2CE; width:15%" |ACRU4
! scope="col" style="background: #F2F2CE; width:15%" |SWAT2012
! scope="col" style="background: #CEE6F2; width:15%" |MIKE-SHE,</br>[[Coverage of structural options within modelling tools#MIKE-SHE|semi-distributed, </br>more conceptual]]
! scope="col" style="background: #CEDAF2; width:15%" |MIKE-SHE,</br>[[Coverage of structural options within modelling tools#MIKE-SHE|fully-distributed, </br>more physical]]
|-
| style="vertical-align: top" |<br/>'''Algorithm <br/>inputs''' <br/>''(input data,<br/>parameters,<br/>model-calculated<br/>states/storages)''
| style="background: #FFF5FA; vertical-align: top" |
<br/>
* S-Pan evaporation
* Soil moisture ''(state)''
* '''''Vegetation properties:'''''
** "Crop" coefficient (vs pan)
** Pitman ET coefficient*
* '''''Soil properties:'''''
** Saturation soil moisture
<small>*determines linear decline of ET with soil moisture decline</small>
<br/>
| style="background: #FFF7F5; vertical-align: top" |
<br/>
* S-Pan evaporation
* Soil moisture ''(state)''
* '''''Vegetation properties:'''''
** "Crop" coefficient (vs pan)
** Pitman ET coefficient* 
* '''''Soil properties:'''''
** Saturation soil moisture
<small>*determines linear decline of ET with soil moisture decline</small>
<br/>
| style="background: #F5FFF5; vertical-align: top" |
<br/>
* A-Pan evaporation
* Soil moisture ''(state)'' 
* '''''Vegetation properties:'''''
** "Crop" coefficient (vs pan)
** Root depth distribution
* '''''Soil properties:'''''
** Saturation soil moisture*
** Field capacity SM
** Wilting point SM
<small>*ET assumed to also decline if soil gets close to saturation, waterlogging, unless wetland plants</small>
<br/>
| style="background: #FFFFF5; vertical-align: top"|
<br/>
* Remaining ET demand (PET - Canopy evap.) 
* Soil moisture ''(state)'' 
* '''''Vegetation properties:'''''
** LAI
** Root depth (max)
** Root distribution
** Demand redistribution coefficient
* '''''Soil properties:'''''
** Field capacity SM
** Wilting point SM
<br/>
| style="background: #F5FCFF; vertical-align: top" |
<br/>
* Remaining ET demand (PET - Canopy evap. - Ponded evap.) 
* Soil moisture ''(state)'' 
* '''''Vegetation properties:'''''
** "Crop" coefficient
** ET curtailment SM
** Root depth (max)
** Root distribution
* '''''Soil properties:'''''
** Field capacity SM
** Wilting point SM
<br/>
| style="background: #F5F8FF; vertical-align: top" |
<br/>
* Remaining ET demand (PET - Canopy evap. - Ponded evap.) 
* Soil moisture ''(state)'' 
* '''''Vegetation properties:'''''
** "Crop" coefficient
** ET vs SM curve parameter
** Root depth (max)
** Root distribution
** ET demand depth distribution
* '''''Soil properties:'''''
** Soil moisture retention curve
<br/>
|-
| style="vertical-align: top" |'''Function <br/>type'''
| style="background: #FFF5FA; vertical-align: top" |linear & threshold
| style="background: #FFF7F5; vertical-align: top" |linear & threshold
| style="background: #F5FFF5; vertical-align: top" |multi-part linear & threshold
| style="background: #FFFFF5; vertical-align: top" |non-linear & threshold
| style="background: #F5FCFF; vertical-align: top" |multi-part linear & threshold
| style="background: #F5F8FF; vertical-align: top" |non-linear & threshold
|-
| style="vertical-align: top" |'''Thresholds'''
| style="background: #FFF5FA; vertical-align: top" |
'''yes:'''
<br/>ET demand,
<br/>Wilting point SM 
| style="background: #FFF7F5; vertical-align: top" |
'''yes:'''
<br/>ET demand,
<br/>Wilting point SM 
| style="background: #F5FFF5; vertical-align: top" |
'''yes:'''
<br/>ET demand,
<br/>Wilting point SM
| style="background: #FFFFF5; vertical-align: top"|
'''yes:'''
<br/>ET demand,
<br/>Wilting point SM 
| style="background: #F5FCFF; vertical-align: top" |
'''yes:'''
<br/>ET demand,
<br/>Wilting point SM 
| style="background: #F5F8FF; vertical-align: top" |
'''yes:'''
<br/>ET demand,
<br/>Wilting point SM 
|}
</br>

== Evapotranspiration (ET) from groundwater (GW) ==
'''Note:''' More coverage of evapotranspiration related terminology and inputs across different tools can be found '''[[Terminology#Evapotranspiration terms across tools|here]]'''
{| class="wikitable"
! scope="col" style="width:10%" | Algorithm <br/>description
! scope="col" style="background: #F2CEE0; width:15%" |WRSM-Pitman </br>(Sami GW)
! scope="col" style="background: #F2D4CE; width:15%" |SPATSIM-Pitman </br>(Hughes GW)
! scope="col" style="background: #CEF2CE; width:15%" |ACRU4
! scope="col" style="background: #F2F2CE; width:15%" |SWAT2012
! scope="col" style="background: #CEE6F2; width:15%" |MIKE-SHE,</br>[[Coverage of structural options within modelling tools#MIKE-SHE|semi-distributed, </br>more conceptual]]
! scope="col" style="background: #CEDAF2; width:15%" |MIKE-SHE,</br>[[Coverage of structural options within modelling tools#MIKE-SHE|fully-distributed, </br>more physical]]
|-
| style="vertical-align: top" |<br/>'''Algorithm <br/>inputs''' <br/>''(input data,<br/>parameters,<br/>model-calculated<br/>states/storages)''
| style="background: #FFF5FA; vertical-align: top" |
<br/>
''riparian area only''
* A-Pan evaporation
* Riparian area
* Aquifer storage ''(state)''
* '''''Vegetation properties:'''''
** "Crop" coefficient (vs pan)
* '''''Aquifer properties:'''''
** Aquifer storage limit for ET
<br/>
| style="background: #FFF7F5; vertical-align: top" |
<br/>
''riparian area only''
* Remaining ET demand (PET - ET from soil)
* Riparian area
* Aquifer storage ''(state)''
* '''''Vegetation properties:'''''
** "Crop" coefficient (vs pan)
** Pitman ET coefficient* 
* '''''Aquifer properties:'''''
** Aquifer storage limit for ET
<br/>
| style="background: #F5FFF5; vertical-align: top" ; rowspan= "3" |
<br/>
''riparian area only''
</br></br>'''Indirect representation:'''
</br>''Specified riparian zone HRU can receive a user-specified fraction of the aquifer outflow from connected upslope HRUs. This water is added to riparian HRU soil in the B-horizon, where it can be accessed for ET and can recharge GW.''
</br></br> ''No ET (or capillary rise) is simulated from the GW store of the riparian HRU.'' 
<br/>
| style="background: #FFFFF5; vertical-align: top"|
<br/>
''represented through capillary rise into the soil driven by ET demand''
* PET
* Aquifer storage ''(state)'' 
* '''''Soil properties:'''''
** Capillary rise rate coefficient
* '''''Aquifer properties:'''''
** Aquifer storage limit for capillary rise
''+ all inputs for ET from soil''
<br/>
| style="background: #F5FCFF; vertical-align: top" |
<br/>
''riparian area only''
<br/>''represented through capillary rise into the soil driven by ET demand''
* Remaining ET demand (PET - Canopy evap. - Ponded evap. - ET from soil) 
* Aquifer storage ''(state)'' 
* '''''Aquifer properties:'''''
** Aquifer storage limit for capillary rise
''+ all inputs for [[#Evapotranspiration (ET) from soil moisture (SM)|ET from soil]]''
<br/>
| style="background: #F5F8FF; vertical-align: top" |
<br/>
''capillary rise is calculated, but roots can also extend below the water table and withdraw directly''
* Remaining ET demand (PET - Canopy evap. - Ponded evap. - ET from soil) 
* Water table depth ''(state)'' 
* '''''Aquifer properties:'''''
** Saturated hydraulic conductivity (K<small>sat</small>)
''+ vegetation property inputs for [[#Evapotranspiration (ET) from soil moisture (SM)|ET from soil]]''
<br/>
|-
| style="vertical-align: top" |'''Function <br/>type'''
| style="background: #FFF5FA; vertical-align: top" |non-linear & threshold
| style="background: #FFF7F5; vertical-align: top" |non-linear & threshold
| style="background: #FFFFF5; vertical-align: top" |non-linear & threshold
| style="background: #F5FCFF; vertical-align: top" |non-linear & threshold
| style="background: #F5F8FF; vertical-align: top" |non-linear & threshold
|-
| style="vertical-align: top" |'''Thresholds'''
| style="background: #FFF5FA; vertical-align: top" |
'''yes:'''
<br/>ET demand,
<br/>Aquifer storage limit for ET
| style="background: #FFF7F5; vertical-align: top" |
'''yes:'''
<br/>ET demand,
<br/>Aquifer storage limit for ET
| style="background: #FFFFF5; vertical-align: top"|
'''yes:'''
<br/>ET demand,
<br/>Aquifer storage limit for capillary rise
| style="background: #F5FCFF; vertical-align: top" |
'''yes:'''
<br/>ET demand,
<br/>Aquifer storage limit for capillary rise
| style="background: #F5F8FF; vertical-align: top" |
'''yes:'''
<br/>ET demand,
<br/>Water table depth vs root depth
|}
</br>

== Interflow generation & routing to channel network ==
{| class="wikitable"
! scope="col" style="width:10%" | Algorithm <br/>description
! scope="col" style="background: #F2CEE0; width:15%" |WRSM-Pitman 
! scope="col" style="background: #F2D4CE; width:15%" |SPATSIM-Pitman 
! scope="col" style="background: #CEF2CE; width:15%" |ACRU4
! scope="col" style="background: #F2F2CE; width:15%" |SWAT2012
! scope="col" style="background: #CEE6F2; width:15%" |MIKE-SHE,</br>[[Coverage of structural options within modelling tools#MIKE-SHE|semi-distributed, </br>more conceptual]]
! scope="col" style="background: #CEDAF2; width:15%" |MIKE-SHE,</br>[[Coverage of structural options within modelling tools#MIKE-SHE|fully-distributed, </br>more physical]]
|-
| style="vertical-align: top" |<br/>'''Algorithm <br/>inputs''' <br/>''(input data,<br/>parameters,<br/>model-calculated<br/>states/storages)''
| style="background: #FFF5FA; vertical-align: top" |
<br/>
''Interflow from soil layer & from "percolation zone"''
* Soil moisture ''(state)''
* Percolation zone storage ''(state)''
* Aquifer storage ''(state)''
* '''''Soil properties:'''''
** Saturation soil moisture
** Field capacity SM
** Interflow rate power coefficient
** Max interflow rate
** Interflow lag coefficient
* '''''Aquifer properties'''''
** Percolation zone max capacity
** Aquifer max capacity
<br/>
| style="background: #FFF7F5; vertical-align: top" |
<br/>
''Interflow from soil layer''
* Soil moisture ''(state)''
* '''''Soil properties:'''''
** Saturation soil moisture
** Field capacity SM
** Interflow rate power coefficient
** Max interflow rate
** Interflow lag coefficient
<br/>
| style="background: #F5FFF5; vertical-align: top"; rowspan= "3" |
<br/>
'''Interflow amount calculated in the same step as surface runoff, not as a separate process:'''
</br>''total surface runoff + interflow runoff is calculated in the [[#Infiltration into soil moisture (vs surface runoff or surface ponding)|infiltration]] vs [[#Surface runoff to channel network|runoff]] step, then these are separated through lagging''
* Surface water present* ''(state)''
* Lag coefficient*
<small> *Lag coefficient separates "quickflow"~surface runoff from "delayed-flow"~interflow. The lagged flow that doesn't reach the channel on the rain day, but instead reaches the channel over subsequent days can be considered interflow </small> 
<br/>
| style="background: #FFFFF5; vertical-align: top"|
<br/>
''Interflow from soil layer''
* Soil moisture ''(state)'' 
* '''''Soil properties:'''''
** Saturation soil moisture
** Field capacity SM
** Drainage slope
** Saturated hydraulic conductivity (K<small>sat</small>)
<br/>
| style="background: #F5FCFF; vertical-align: top" |
<br/>
''Interflow from "interflow zone (IZ)"''
</br>''to calc input into IZ:''
* Macropore flow (Throughfall*by-pass coefficient)
* Soil moisture ''(state)'' 
* '''''Soil properties:'''''
** Saturation soil moisture
** Field capacity SM
** Drainage slope
** Saturated hydraulic conductivity (K<small>sat</small>)
''to calc outflow from IZ:''
* IZ storage ''(state)''
* '''''IZ properties:'''''
** IZ storage threshold for outflow
** lateral outflow rate constant
** vertical outflow rate constant (GW recharge)
<br/>
| style="background: #F5F8FF; vertical-align: top"; rowspan= "3"  |
<br/>
'''Interflow not modelled as a separate process to "saturated zone" flow.''' 
</br> ''Lateral flow through a "saturated zone" material layer in the model which is not frequently saturated and/or is perched above more permanently saturated layers can be considered as interflow. Flows through different layers can be exported as separate model outputs.''
</br></br>
''See [[#Groundwater (GW) flow|groundwater flow]] and [[#Aquifer exchanges with channel: aquifer outflow to channel and channel transmission loss|groundwater outflow to channel]] sections''
<br/>
|-
| style="vertical-align: top" |'''Function <br/>type'''
| style="background: #FFF5FA; vertical-align: top" |non-linear & threshold
| style="background: #FFF7F5; vertical-align: top" |non-linear & threshold
| style="background: #FFFFF5; vertical-align: top" |non-linear & threshold
| style="background: #F5FCFF; vertical-align: top" |two step: non-linear & threshold, linear reservoir & threshold
|-
| style="vertical-align: top" |'''Thresholds'''
| style="background: #FFF5FA; vertical-align: top" |
'''yes:'''
<br/>Field capacity SM,
<br/>Percolation zone max storage + Aquifer max storage 
| style="background: #FFF7F5; vertical-align: top" |
'''yes:'''
<br/>Field capacity SM
| style="background: #FFFFF5; vertical-align: top" |
'''yes:'''
<br/>Saturation SM
| style="background: #F5FCFF; vertical-align: top" |
'''yes:'''
<br/>Field capacity SM
<br/>IZ storage threshold for outflow
|}
</br>

== Aquifer recharge ==

== Groundwater (GW) flow ==

== Aquifer exchanges with channel: aquifer outflow to channel and channel transmission loss ==