2.5.1.2 Water balance uncertainty

The water balance terms summarised here are a different set of model outputs to the hydrological response variables generated at model nodes, which are reported in companion product 2.6.1 (surface water numerical modelling; Zhang et al., 2018) and companion product 2.6.2 (groundwater numerical modelling; Herron et al., 2018) for the Hunter subregion. The range, as represented by the 10th and 90th percentile values for each groundwater balance term, summarises the results of 229 of the 1450 original simulations of the groundwater model. This subset of model simulations was chosen through the uncertainty analysis described in Section 2.6.2.8 of Herron et al. (2018). The chosen 229 groundwater simulations are those in which the watertable level and streamflow meet observation data most closely.

The range, as represented by the 10th and 90th percentile values for each surface water balance term reflects the top 10% of the original 3000 model simulations, evaluated against annual streamflow observations at 17 Hunter subregion gauges. The gauges chosen for evaluating model performance had at least 25 years of daily data and included unregulated and regulated parts of the river system.

Last updated:
18 January 2019