Results

Zero flow threshold

The assessment supported the use of a threshold of 0.04 ML/day as the zero flow threshold with a Pearson correlation coefficient of 0.64 (Table 2). Thresholds of 0.03, 0.04 and 0.05 ML/day all showed good overlap with observed flow data so the higher correlation score was used to identify the best value. A higher correlation was not expected from this data due to the accuracies associated with Source Modelling and the issues with limiting the data at 365 days.
Table 2: Pearson correlation coefficient results for the different flow thresholds used when compared back to the observed flow data for the number of flowing days.