Development of criteria for draining shallow watertables in the Isis irrigation area

Abstract

This project was proposed to the Sugar Research Council because qualitative data suggested a significant problem with waterlogging and salinity in hydromorphic sedimentary soils in the Bundaberg to Maryborough region. Also there were no quantitative data to indicate elevation of watertables in areas of hazard, nor were there any criteria to determine an approach to management of shallow watertables in the region.

Objectives

(1) Quantify the seasonal persistence of perched watertables in various soil types in relation to previously recognised soil morphological features associated with prolonged wetness.

(2) Determine the areas within which drainage schemes are required.

(3) Develop drainage design criteria/models for recognisable soil type x environmental situations to overcome the need for site specific investigations when farm and community drainage works are indicated.

(4) Acquire baseline water quality data for use in assessment of environmental impact of drainage works.