@@ -1473,6 +1473,27 @@ land cover type.
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| vcmx25 | Maximum rate of carboxylation at 25°C |
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| | [:math: `umol\ CO_{2 }/m^2 /s`] |
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+------------+----------------------------------------------------------+
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+ | AXAJ | Tension water distribution inflection parameter |
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+ +------------+----------------------------------------------------------+
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+ | BXAJ | Tension water distribution shape parameter |
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+ +------------+----------------------------------------------------------+
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+ | XXAJ | Free water distribution shape parameter |
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+ +------------+----------------------------------------------------------+
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+ | rsurfsnow | Surface resistance for snow [s/m] |
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+ +------------+----------------------------------------------------------+
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+ | scamax | Maximum fractional snow covered area [0-1] |
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+ +------------+----------------------------------------------------------+
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+ | snowretfac | Snowpack water release timescale factor [1/s] |
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+ +------------+----------------------------------------------------------+
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+ | ssi | Liquid water holding capacity for snowpack |
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+ | | [:math: `m^3 /m^3 `] |
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+ +------------+----------------------------------------------------------+
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+ | tau0 | Snow albedo decay timescale parameter [s] |
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+ +------------+----------------------------------------------------------+
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+ | imperv | Impervious factor |
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+ +------------+----------------------------------------------------------+
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+
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+
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.. _section-a8 :
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@@ -1535,6 +1556,10 @@ within these files are described in the tables below.
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| LKSAT | Lateral saturated soil hydraulic |
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| | conductivity [:math: `m/s`] |
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+-----------------------+----------------------------------------------+
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+ | NEXP | Exponent in the decay function for lateral |
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+ | | Ksat over depth |
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+ +-----------------------+----------------------------------------------+
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+
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.. _section-a9 :
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@@ -1611,12 +1636,18 @@ the tables below.
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+----------------------+-----------------------------------------------+
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| n | Manning's roughness |
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+----------------------+-----------------------------------------------+
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+ | nCC | Compound Channel Manning's roughness |
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+ +----------------------+-----------------------------------------------+
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| order | Strahler stream order |
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+----------------------+-----------------------------------------------+
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| to | To Link ID |
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+----------------------+-----------------------------------------------+
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| time | Time of measurement |
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+----------------------+-----------------------------------------------+
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+ | TopWdth | Top Width [m] |
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+ +----------------------+-----------------------------------------------+
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+ | TopWdthCC | Compound Channel Top Width [m] |
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+ +----------------------+-----------------------------------------------+
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.. _section-a10 :
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@@ -1667,6 +1698,8 @@ in the tables below.
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+-----------------------+----------------------------------------------+
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| ComID | NHDCatchment FEATUREID (NHDFlowline ComID) |
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+-----------------------+----------------------------------------------+
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+ | Loss | Fraction of bucket output lost |
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+ +-----------------------+----------------------------------------------+
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.. _section-20 :
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@@ -1757,6 +1790,38 @@ Variables within the `LAKEPARM.nc` file are described in the tables below.
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A13. Restart Files Overview
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----------------------------
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+ **Cold start versus warm start model simulations: **
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+
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+ When one start the model as a `cold start ` (meaning that it is starting with the default values at the very
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+ beginning), it takes time for the model to warm up and reach an equilibrium state. For example, consider
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+ simulating streamflow values for a stream which has a base flow of at least 10 cms during the year, and you
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+ have a `cold start `. The default values of the streamflow might be zeros at the start of the modeling. It then
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+ takes time for the simulated streamflow within the model to reach the 10 cms. In contrast, a `warm start ` is
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+ when the model simulation begins with the simulated values of a given time step (starting time step) from a
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+ previous run. This eliminates the processing time the model would take to reach an equilibrium state.
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+ Depending on which variable of the model you are looking at, the time required to reach to the warm state may
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+ differ. For example, groundwater requires a longer time period to reach to equilibrium.
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+
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+ **How to do a warm start simulations with WRF-Hydro? **
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+
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+ WRF-Hydro model outputs two set of model restart files (:file: `RESTART.YYYYmmddHH_DOMAIN ` and
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+ :file: `HYDRO_RST.YYYY-mm-dd_HH:MM_DOMAIN1 `) which store the model states at a specified time and
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+ could be used to start the model from that point in time. :file: `RESTART.YYYYmmddHH_DOMAIN ` stores the
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+ state variables reqiured for restarting LSM and :file: `HYDRO_RST.YYYY-mm-dd_HH:MM_DOMAIN `
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+ stores the state variables required to resume the hydro components of the WRF-Hydro model.
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+
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+ To warm start the LSM part of the model, specify path to the restart file in the :file: `namelist.hrldas `
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+ using `RESTART\_FILENAME\_REQUESTED ` option.
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+ To warm start the HYDRO part of the model, specify the path to the `HYDRO\_RST ` file in
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+ the :file: `hydro.namelist ` using the option `RESTART\_FILE `, and also set the `gw\_restart ` option to 1.
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+ If the path to the files are left empty or commented out, it means the model simulation is cold started.
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+
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+
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+ One could control the frequency of outputting restart files using the options `RESTART\_FREQUENCY\_HOURS `
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+ and `rst\_dt ` in the :file: `namelist.hrldas ` and :file: `hydro.namelist `, respectively. If these options are set
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+ to -9999, model outputs restart files once a month. Restart files are large in size, and therefore user
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+ needs to be cautious of how frequently it outputs the restart files.
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+
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.. figure :: media/restarts.png
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:align: center
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@@ -1780,6 +1845,14 @@ A13.1 RESTART_MP File Variable Table
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| **Variable | **Description ** | **Units ** |
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| name** | | |
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+=============+===========================================+==================+
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+ | ACCPRCP | Accumulated precipitation | :math: `mm` |
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+ +-------------+-------------------------------------------+------------------+
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+ | ACCECAN | Accumulated canopy evaporation | :math: `mm` |
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+ +-------------+-------------------------------------------+------------------+
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+ | ACCEDIR | Accumulated direct soil evaporation | :math: `mm` |
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+ +-------------+-------------------------------------------+------------------+
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+ | ACCETRAN | Accumulated transpiration | :math: `mm` |
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+ +-------------+-------------------------------------------+------------------+
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| ACMELT | accumulated melting water out of snow | :math: `mm` |
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| | bottom | |
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+-------------+-------------------------------------------+------------------+
@@ -1902,24 +1975,16 @@ A13.1 RESTART_MP File Variable Table
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+-------------+-------------------------------------------+------------------+
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| VEGFRA | Vegetation fraction | |
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+-------------+-------------------------------------------+------------------+
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- | ACCPRCP | Accumulated precipitation | :math: `mm` |
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- +-------------+-------------------------------------------+------------------+
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- | ACCECAN | Accumulated canopy evaporation | :math: `mm` |
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- +-------------+-------------------------------------------+------------------+
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- | ACCEDIR | Accumulated direct soil evaporation | :math: `mm` |
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- +-------------+-------------------------------------------+------------------+
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- | ACCETRAN | Accumulated transpiration | :math: `mm` |
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- +-------------+-------------------------------------------+------------------+
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- | SMOISEQ | volumetric soil moisture | :math: `m^3 /m^3 ` |
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- +-------------+-------------------------------------------+------------------+
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+
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+
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.. _section-23 :
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A13.2 HYDRO_RST File Variable Table
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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.. note ::
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- The variables are written to the `HYDRO_RST ` file in the subroutine of
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+ The variables are written to the `HYDRO\_RST ` file in the subroutine of
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``RESTART_OUT_nc `` in the :file: `Routing/module_HYDRO_io.F90 `. The tables below
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contain all the information on the dimensions and variables in the Hydro
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RESTART file (`HYDRO\_RST `).
@@ -2663,3 +2728,60 @@ layers contain the initialized ice.
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Currently there are no namelist options to change parameter values.
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Several important parameters that can be modified can be found in:
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:file: `src/Land_models/NoahMP/phys/surfex/modd_snow_par.F90 `
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+
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+
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+ .. _section-a17 :
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+
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+ A17. Model Output Variables
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+ ---------------------------------------------
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+
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+ .. rubric :: 1. Land surface model output variables
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+
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+ \
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+ :file: `{ YYYYMMDDHHMM } .LDASOUT_DOMAIN{ X } `
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+
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+ .. rubric :: 2. Land surface diagnostic output variables
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+
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+ \
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+ :file: `{ YYYYMMDDHHMM } .LSMOUT_DOMAIN{ X } `
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+
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+
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+ .. rubric :: 3. Streamflow output variables at all channel reaches/cells
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+
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+ \
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+ :file: `{ YYYYMMDDHHMM } .CHRTOUT_DOMAIN{ X } `
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+
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+
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+
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+ .. rubric :: 4. Streamflow output variables at forecast points or gage reaches/cells
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+
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+ \
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+ :file: `{ YYYYMMDDHHMM } .CHANOBS_DOMAIN{ X } `
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+
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+
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+
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+ .. rubric :: 5. Streamflow output variables on the 2D high resolution routing grid
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+
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+ \
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+ :file: `{ YYYYMMDDHHMM } .CHRTOUT_GRID{ X } `
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+
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+
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+
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+ .. rubric :: 6. Terrain routing variables on the 2D high resolution routing grid
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+
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+ \
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+ :file: `{ YYYYMMDDHHMM } .RTOUT_DOMAIN{ X } `
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+
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+
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+
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+ .. rubric :: 7. Lake output variables
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+
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+ \
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+ :file: `{ YYYYMMDDHHMM } .LAKEOUT_DOMAIN{ X } `
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+
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+
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+
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+ .. rubric :: 8. Ground water output variables
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+
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+ \
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+ :file: `{ YYYYMMDDHHMM } .GWOUT_DOMAIN{ X } `
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