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Line 12: =The resolution of my underlying DEM is 1m and model cell size is 1m. Is there any benefit using SGS?= No. The SGS sample points within once cell would have the same elevation, so there wouldn't be any precision benefit and the model will have longer initialisation time. =Does using SGS increase model runtimes?= Turning SGS on can inrease run times byt 20-30%, but in some cases the improvement in model stability can actually cause a reduction in run times. Also, being able to go to a larger grid size and still keep the hydraulic accuracy means that runs can be performed much faster. =I'm using SGS and my water level extent is larger than depth extent. Why?=

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