Hello all, In a recent discussion a few points came up regarding ensuring accuracy and limiting variables in SCADA and field data to be used in calibration & validation of a model. For our past clients, we have ensured that days chosen for calibration with an EPS model should be dry, high-usage weekdays, with no additional uncountable flow (flushing, etc). In a recent case, rain was prevalent throughout the data collection period and rainy days were used for both calibration and validation cases. The argument against using rainy days for system calibration is that irrigation usage may be suppressed, thus deviating from the target 'Average Day' case. Does anyone have ideas regarding additional effects that a rainy day may have on system behavior and customer usage? Would these effects be great enough to invalidate the test case? Obviously it is a very different story for runoff, sewer, and surface water models, but this particular example is a pressure pipe distribution system. Are there any other variables, environmental or otherwise, that are considered critical to control for when obtaining good calibration data?Thanks, Jeremy