"The lower Namoi Valley is an alluviated valley which occupies an area of 5100 km in northern New South Wales. The valley contains a sequence of non-marine alluvial deposits of Tertiary and Quaternary age which have a maximum thickness of 120 metres. The deposits have been subdivided into three geological formations on the basis of age, lithology and distribution. they contain many aquifer zones that have widely varying salinities.

This report was prepared in 1985 and in a draft form has provided the basis for hydrogeological assessment, mapping and modelling since that time. Due to current interest in this area there is a need to provide the data and findings in the report to the wider community, It is on this basis that the report is presented.

The approach of this report is to integrate three interrelated disciplines; geology, hydrodynamics and hydrochemistry, and apply them to the unconsolidated sediments of the lower Namoi Valley."