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particular year and allows updates of the model to always use the same year so that there is not a <br />moving baseline for calculating drawdown. <br />Available Head Calculations <br />Available head is not measured it is calculated using the model. The available head is the difference <br />between the water level and the upper bedrock surface of the aquifer. <br />Havailable = ElevationModel 2010 pumping — Elevationtop of geologic formation <br />If the calculated available head (Havailable) is greater than 10 feet then the aquifer is considered <br />confined and the 50% head analysis takes place. <br />I f Havailable > 10 feet then: <br />The elevation of the top of the geologic formation (Elevationtop of geologic formation) is added to 50% of <br />the calculated available head (Havailable) to calculate the 50% head elevation (Havailable elevation). <br />1 <br />Havailable elevation = Elevationtop of geologic formation + 2 * Havailable <br />If the modeled head (ElevationModel 2040 pumping)is less than the 50% head elevation <br />(Havailable elevation) then that cell is flagged. <br />I f Havailable elevation < ElevationModel 2040 pumping <br />The 2010 pumping data from the DNR SWUDS database is input into MM3 and the output is used to <br />define the water level. The cumulative reported 2010 pumping is divided by 365 days to get average <br />daily pumping which is then input into the model. Note: If an area has 10 feet of head or less it is <br />considered unconfined and removed from the analysis Also MM3 is a steady-state model and does not <br />account for seasonal or operational variation. <br />