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About ALD

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  1. Page 65 is a very confusing page in the manual especially the last 7 lines at the bottom of the page where later statements appear to contradict earlier ones. It would be greatly appreciated by all FEMWATER users if somebody who really understands in intimate detail how the variable boundary condition works, could explain how it works better then it is explained in the manual. Regards
  2. HI All Does anybody have any ideas about how to do a zone budget for Femwater? Are there any tools that do it? I would like to know how much water is flowing through each material, through boundaries, totals for wells, etc.. Regards
  3. Thats not strictly true, I THINK! It is possible to have a negative pressure head beneath the confining layer in FEMWATER (a large Q pumping well will desaturate an area with appropriate boundary head conditions that are just at the elevation of the base of the confining layer) and another negative pressure head in the unsaturated zone. This is an example of two water tables. A water table occurs where pressure head is zero and unsaturated zone occurs where pressure head is negative (suction). I tested this on a little test model and it ran steady state. Does anyone else agree with me?
  4. HI Michael Thanks for that tip, let me try that. Regards
  5. Hi Femwater requires initial conditions in a steady state run to be assigned as pressure heads. There is an option in GMS6.5 to generate the initial pressure heads using total heads. However in a multiple aquifer model with a confined aquifer, one can have two different total heads at the same XY location resulting from a nest of piezometers at the same location, one being a water level in the confined lower aquifer and another being the water table level in the upper unconfined aquifer. This situation therefore implies that the total head dataset should have a z value in it. For the lower confined aquifer that z value should be in the vicinity of the bores screens, and in the femwater model in the vicinity of the nodes within the material of interest over which the real bore is screened. For the upper aquifer the total head dataset should have a z value in it that is in the vicinity of nodes in the upper unconfined material. What experience have others had with modelling this and what formats have they chosen for files as input into GMS. I think its tricky trying to get the z value elevation right to match the relevant material node and am not sure GMS can even handle this, although when i used it years ago I think it did. Regards ALD
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