H_
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Water Level (Head)
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Water level of the h-point of the nearest cell. If the cell is dry, the ground level (ZC) is output.
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The average water level of all wet cells along the line. If all cells are dry, the lowest cell’s ground level (ZC) is output.
If a polyline is used, the average water level along each line segment is output.
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Q_
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Flow or discharge.
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N/A (zero flow results).
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The flow crossing the line. For a polyline, the sum of the flows crossing each polyline segment.
The flow across a line or polyline segment is determined by summing the flow across cell sides whose perpendiculars’ intersect the line (see Figure 4 .10).
The sign of the flow across a line or polyline segment is positive if the flow is in the same direction when looking in a direction perpendicular to the line with the start of the line on your left and the end on your right.
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QA
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Flow Area (m2).
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N/A (zero area results).
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The flow area is calculated using the same cell sides as for Q_. An adjustment for obliques lines is made.
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QI
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Integral Flow (m3)
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N/A (zero integral flow results).
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Integrates the flow (as determined for Q_ above) over time (ie. the area under a Q_ time-series curve). If Write PO Online is set to ON, the integral flow is not calculated until the simulation is complete.
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QX
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Flow in X-direction.
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N/A (zero flow results).
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The X component of Q_ (ie. the sum of the flows at the u-points).
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QY
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Flow in Y-direction.
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N/A (zero flow results).
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The Y component of Q_ (ie. the sum of the flows at the v-points).
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V_
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Velocity (m/s)
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The magnitude of the resolved vector based on the two u-points and two v-points of the cell in which the point falls. Exactly which cell is selected may be uncertain if the point falls exactly on a cell’s side.
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N/A. Do not use lines or polylines for velocity output. At present uses the cell in which the line or each polyline segment starts. Future release plan to calculate Q_ and QA, and output the velocity as Q_/QA (ie. the depth and width averaged velocity along the line).
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VA
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Velocity Angle (degrees relative to east where east is zero, north is 90, etc.).
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The angle of V_.
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N/A. See comments above for V_.
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Vu
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u-point velocity (m/s)
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The magnitude of the u-point velocity (ie. across the right hand side of the cell).
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N/A. See comments above for V_.
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Vv
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v-point velocity (m/s)
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The magnitude of the v-point velocity (ie. across the top side of the cell).
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N/A. See comments above for V_.
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VX
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Velocity in X-direction (m/s).
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The magnitude of the average of the u-point velocities (ie. across the left and right hand sides of the cell).
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N/A. See comments above for V_.
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VY
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Velocity in Y-direction (m/s).
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The magnitude of the average of the v-point velocities (ie. across the bottom and top sides of the cell).
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N/A. See comments above for V_.
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W_
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Wind (undocumented and yet to be tested feature on PC version).
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