[<< wikibooks] HydroGeoSphere/Observation Wells and Points
The following instructions are used to output hydraulic head, saturation (if variablysaturated) and nodal fluid flux at a single node or a group of nodes lying on a line.
Output is written to a TECPLOT-formatted file called prefixo.observation_well_flow.-obs_well_name.dat.
If the problem is formulated as a dual continuum then extra columns of output will be produced with the dual continuum head, saturation (if variably-saturated) and fluid flux. If the node is not a dual continuum node, no data values (currently -999.0) will be written instead.
If the problem is formulated with a surface flow domain then extra columns of output will be produced with surface flow head and fluid flux. If the node is not a surface flow node, a no data value (currently -999.0) will be written instead.
These instruction do not affect the flow solution.


== Make observation point ==
well_name Descriptive name for the well up to 40 characters.
x1, y1, z1 xyz-coordinates of the observation point.The node closest to this point will be flagged as an observation point node.
Data for each timestep in the flow solution is written as one line in the output file. Each line contains the time and then the porous medium hydraulic head, saturation (if variably-saturated), fluid flux, node coordinates and node number.

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== Make node observation point ==
well_name Descriptive name for the well up to 40 characters.
nnumber The number of the node to be made an observation point.This node will be flagged as an observation point node.
Data for each timestep in the flow solution is written as one line in the output file. Each line contains the time and then the porous medium hydraulic head, saturation (if variably-saturated), fluid flux, node coordinates and node number.

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== Make observation well ==
well_name Descriptive name for the well up to 40 characters.
x1, y1, z1 xyz-coordinates of one end of the observation well.
x2, y2, z2 xyz-coordinates of the other end of the observation well.Element face edges (i.e. segments) which form the shortest path between the two nodes closest to the end points of the well (i.e. x1, y1, z1 and x2, y2, z2) will be chosen to produce output.
Each timestep in the flow solution represents a Tecplot zone in the output file, and each zone contains one line per observation well node. Each line contains the porous medium hydraulic head, saturation (if variably-saturated), fluid flux, node coordinates and node number.
Note that fluid fluxes at internal nodes are currently reported as zero unless they are constant head or specified flux nodes.

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