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Land Surface Elevation


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Is GMS using land surface elevations in a manner that MODFLOW is not aware of?

For example, is land surface elevation used by GMS to characterize any aspects of streams or rivers in the STR1 or RIV1 Packages?

Thank you.

Greetings Alan:

As an example, in a multi-layer model, streams are located in Layers 2 or 4 (this assumes that overlying layers such as layer 1 are not present or are inactive where the streams are located).

Further flooding of some model cells frequently occurred at the top active layer where flooding was not thought to physically occur. To remedy this, the top of layer 1 was set to 10,000 ft above mean sea level (msl). The physical reality indicates that the top of the land surface is about + 4500 ft msl

Would GMS use this layer 1 land surface elevation rather than values entered into the STR1 package to derive stream stage or stream conductance?

Thank you.


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