Project File:Channel Routing – Optional

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3.7.1 Required Inputs

The following cards are REQUIRED for the simulation of channel routing.

Card Argument Description
DIFFUSIVE_WAVE
none Specifies explicit diffusive-wave 1-D channel routing.
CHAN_EXPLIC
none Specifies explicit diffusive-wave 1-D channel routing. Performs same function as DIFFUSIVE_WAVE.
CHANNEL_INPUT  "filename.cif"
file name Input ASCII file containing channel network connectivity and cross-sectional information for each link/node.
STREAM_CELL  "filename.gst"
file name Input ASCII file containing channel/grid connectivity information.
OUTLET_HYDRO  "filename.otl"
file name Output ASCII file containing discharge (m3 s-1) unless QOUT_CFS flag is specified (ft3 s-1)
SECTION_TABLE  "filename.ext"
file name Input ASCII file containing cross-section information for irregular, break-point channel cross-sections. REQUIRED if look-up table cross-sections are specified in the CHANNEL_INPUT file.


3.7.2 Initial Condition and Boundary Condition - Optional

Card Argument Description
EXPLIC_BACKWATER  "filename.ext"
file name Save explicit channel routing end of run values of channel depth (m) and discharge (m3 s-1) for each cell.
EXPLIC_HOTSTART  "filename.ext"
file name Start explicit channel calculations using the values of channel depth and flow in the named file.
WRITE_CHAN_HOTSTART  "filename.ext"
file name Save explicit channel routing end of run values of channel depth (m) and discharge (m3 s-1) for each cell.
READ_CHAN_HOTSTART  "filename.ext"
file name Start explicit channel calculations using the values of channel depth and flow in the named file.
OVERBANK_FLOW
none Allow water in channel to flow back onto overland flow plane when stream elevation is above top of bank and the adjacent overland cell elevation.
OVERLAND_BACKWATER
none Include backwater effects on overland when stream water surface elevation is greater than overland flow surface elevation without allowing water in channel to flow back onto overland.
CHAN_POINT_INPUT
file name Input ASCII file containing the point source input location, discharge, and concentrations.

3.7.3 Stream Losses/Gains - Optional

3.7.3.1 General

Card Argument Units Description
STREAM_LOSS
none none Card is used to specify that stream losses be computed when the WATER_TABLE card is not included in the project file.

3.7.3.2 Parameters

Used with WATER_TABLE or STREAM_LOSS card. These parameters may also be distributed along the channel by assigning in the CHAN_INPUT file.

Card Argument Units Description
K_RIVER  ##.##
real cm hr-1 Uniform hydraulic conductivity of streambed material. REQUIRES WATER_TABLE or STREAM_LOSS. May also be distributed in CHAN_INPUT file.
M_RIVER  ##.##
real cm Uniform thickness of streambed material. Requires WATER_TABLE or STREAM_LOSS. May also be distributed in CHAN_INPUT file.

3.7.4 Optional Output

Card Argument Description
IN_HYD_LOCATION  "filename.ihl"
table name Input ASCII file specifying link/node pairs to write out time series data specified by OUT_HYD_LOCATION, OUT_DEP_LOCATION, or OUT_CON_LOCATION.
OUT_HYD_LOCATION  "filename.ohl"
filename Filename to output time series discharge data (m3 s-1 or ft3 s-1) at points specified in IN_HYD_LOCATION. REQUIRED if IN_HYD_LOCATION was specified.
OUT_DEP_LOCATION  "filename.odl"
filename Filename to output channel depths (m) every HYD_FREQ time steps at locations specified in the IN_HYD_LOCATION file.
IN_SED_LOC  "filename.isl"
table name Input ASCII file containing a list of internal link/node locations where the user wants to save sediment hydrographs. Format identical to IN_HYD_LOC option. REQUIRES SOIL_EROSION.
OUT_SED_LOC  "filename.osl"
filename Filename to output sediment flux hydrographs every HYD_FREQ time steps at internal catchment locations specified in the IN_SED_LOC file. REQUIRED if SOIL_EROSION and IN_SED_LOC card are specified.
STRICT_JULIAN_DATE
none Specifies all time series data use strict Julian format.
CHAN_DEPTH  "filename.cdp"
filename Filename to output link/node data of channel depth (m) every MAP_FREQ time steps.
CHAN_STAGE  "filename.cds"
filename Filename to output link/node data of channel stage (m) every MAP_FREQ time steps.
CHAN_DISCHARGE  "filename.cdq"
filename Filename to output link/node data of channel discharge (m3 s-1) every MAP_FREQ time steps.
CHAN_VELOCITY  "filename.cdv"
filename Filename to output link/node data of channel velocity (m s-1) every MAP_FREQ time steps.


GSSHA User's Manual

3 Project File
3.1     Required Inputs
3.2     Mapping Table – Optional
3.3     Overland Flow – Required
3.4     Interception – Optional
3.5     Rainfall Input and Options – Required
3.6     Infiltration – Optional
3.7     Channel Routing – Optional
3.8     Continuous Simulations – Optional
3.9     Saturated Groundwater Flow – Optional
3.10     Soil Erosion – Optional
3.11     Constituent Transport – Optional
3.12     Subsurface Drainage Network – Optional
3.13     Output Files – Required


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