Because we will be simulating the PMF and other low-frequency events to spillway adequacy and inundation extents, knowing the critical duration and reproducing volumes or peaks that match the critical duration is of primary consideration (in this location, peak flows are of primary consideration). Performance metrics that measure goodness-of-fit, like Nash-Sutcliffe efficiency, indicate if we are accurately reproducing the hydrologic response. The Percent-Bias metric indicates over or under-prediction of runoff volume.
