Chu · MODFLOW problem cells

Diagnostic map. These are model results, not observed groundwater or flood depths.

Compare model layers

Steady heads are the saved G2 mean-stress initial solution, not observed piezometry. Contours are every 10 m. Click any coloured grid cell for heads, terrain, drain level and flow properties.

Border diagnosis: the grid is connected across the border. Drain elevations and groundwater properties change at the inherited footprint. Input diagnosis · Controlled drainage tests. Natural-seepage comparison.

P01 · Later G2 run

3408 cells exceed terrain by more than 0.01 m at least once during 2003–2019. Colour shows each cell’s maximum excess, which can occur on different dates.

0.01–1 m

>1–5 m

>5 m

Finite-resistance seepage boundaries can sustain head above their elevation. The physical realism remains unresolved.

P02 · Historical run

Purple cells show the earlier standalone run’s final upper-layer exceedances. Enable this layer with the map control.

P03: high head at a grid perimeter. Northern neighbour is inactive; no local river/drain package in that earlier configuration. This is evidence for investigation, not a demonstrated boundary correction.

Find a cell

Labels: layer starts at 1; row and column start at 0. Hover or click for every highlighted cell’s ID. Grey grid cells are not proven physically valid.

QGIS GeoPackage · Exceedance PDF · Steady head GeoTIFF · Head / drain comparison PDF
Cell descriptions CSV · Sources & interpretation