Cross section, scour chain and particle size data for Gulungul and Ngarradj Creeks: 2006 to 2009

2010

Internal Report 574
Saynor M, Houghton R, Erskine W, Smith B & Crisp E
Supervising Scientist Division
Department of the Environment, Water, Heritage and the Arts

About the report

Stream channel stability studies have been conducted in Gulungul and Ngarradj Creeks in the Magela Creek catchment for several years to establish baseline conditions against which mining impact can be assessed.

Data have been collected in the Ngarradj catchment since 1998 and were scaled following the 2004 dry season measurements. Data collection in Ngarradj Creek was increased again following Cyclone Monica in April 2006 and the large flood in February 2007. Bed material samples and cross sections were surveyed from only a few selected locations in 2008 and 2009. This report contains cross section and bed material samples from Ngarradj Creek for the period 2006 to 2009.

There are 12 permanently monumented (marked) cross sections installed on Gulungul Creek that have been surveyed during the dry seasons of 2002 to 2009. An additional cross section (DG12) has been generated using the data obtained from velocity area river gaugings for the culvert at the Arnhem Highway. Bed material grab samples for particle size analysis were collected each year at each of the cross sections (excluding DG12).

Scour chains were installed and measured at some of the cross sections to provide information about the scour and fill that occurs during each wet season. Cyclone Monica impacted on the Gulungul Catchment in 2006 and there was a large flood during the 2007 wet season in late February/early March. This report contains data collected during the dry season Gulungul Creek for the period 2006 to 2009.