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Are the pumping rates interpolated between time periods? I have pump totalizer data on irregular time steps and I am trying to make sure that I am representing them correctly in the pump time series. In the example below I show the date and the totalizer readings in (gals). I convert the total gals to an average gpm computed over the time period since the last reading, then to a ft3/day for input into modflow. Does modflow interpolate the flow between time steps, or does it use a specified flow rate for each time step until another one is specified (stepped pump rate). For example is the pump rate on 3/13/12 in the example below 0.00 ft3/day, or is it 77.33 ft3/day? I want to make sure that I get the mass balance for pumped volume correct. Date gals) (gpm) (ft3/day) 3/12/12 0.0 0.0 0.0 3/15/12 5,212.0 1.2 -232.3 3/16/12 8,674.0 2.4 -462.8 3/19/12 9,752.0 0.2 -48.0