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1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />Drain Gauge User's Manual <br />4. Collecting Data <br />tion systems, the flushing events must be identified from <br />the time series data from the drain gauge water depth sen- <br />sor (Figure 11). The data will be characterized by filling <br />and flushing events. A total count of the readily -apparent <br />flushing events is multiplied by 1 mm to calculate the total <br />drainage during the period of interest <br />Drain Gauge Under Rotatoes <br />140 <br />120 <br />100 <br />4 80 <br />�_ <br />cE � <br />c <br />40 <br />20 <br />0 <br />55 60 65 70 75 SO <br />Tirrs� <br />d�� <br />Figarre 7 7: Typical time series data from Drain Gauge water depth sensor <br />during vet conditions. <br />A sample program for use with CSI data loggers is <br />included at the end of this manual. <br />If drainage resolution of less than 1 mm is desired, the <br />drainage can be calculated from the volume of solution <br />accumulated in the siphon chamber. The volume of solu- <br />tion in the siphon chamber can be calculated using the <br />generic drain gauge calibration function: <br />Vol (cm3) = 0.33 * mV - 9.8 <br />25 <br />