There are gaps in all the datasets used here:

  • The observed water level data are predominantly in the alluvium (which hosts the most commonly utilised groundwater resource in the Namoi subregion) and not in the Permian units where the coal resource development is occurring and drawdowns will be greatest.
  • The nested piezometers are predominatly in the alluvium, nested piezometers are necessary for monitoring of vertical hydraulic gradients that could be generated by extracting groundwater at depth (e.g. coal seam gas or underground coal mines).
  • The measured hydraulic properties are dominated by the hydraulic conductivity with very little information on the storage properties.
  • The recharge described here is only the dryland diffuse recharge. No attempt has been made at understanding recharge due to flooding or irrigation, these will be incorporated in the groundwater modelling through outputs of the river modelling (in companion product 2.6.1 for the Namoi subregion (Aryal et al., 2018)).
  • The role of faults as conduits or barriers to flow has not been investigated here.
  • Groundwater quality has not been assessed in this product.

More information on data gaps will be provided in later products, because the modelling and analysis contributes to identifying further gaps. Likewise, recommendations for monitoring will be reported in later products including the impact and risk analysis (product 3-4) for the Namoi subregion.

Last updated:
6 December 2018
Thumbnail of the Namoi subregion

Product Finalisation date