Territory Stories

Modelling dry season flows and predicting the impact of water extraction of flagship species



Modelling dry season flows and predicting the impact of water extraction of flagship species


Georges, Aurthur; Webster, Ian; Guarino, Fiorenzo; Jolly, Peter; Thoms, Martin; Doody, Sean; CRC for Freshwater Ecology (Australia); University of Canberra. Applied Ecology Research Group


E-Publications; E-Books; PublicationNT; 57/2002; National River health program




Daly River


The aim of this project is to contribute to recommendations on environmental flows to ensure that they are consistent with maintaining the biota of the Daly River, given competing demands of agriculture, recreation and tourism, conservation and Aboriginal culture. Our focus is on flow, connectivity and water temperatures.


Made available by via Publications (Legal Deposit) Act 2004 (NT); Submitted to the Northern Territory. Department of Infrastructure Planning and Environment

Table of contents

1. Project Details -- 2. Executive Summary -- 3. Interpretation of the Brief -- 4. Variation of the Brief -- 5. Background -- 6. The Daly Drainage -- 7. The Pig-nosed turtle -- 8. Analysis of Historical Flow Data -- 9. Analysis of Contemporary Flow Data -- 10. Modelling Flow Reduction -- 11. Water Temperature Versus Flow -- 12. Impact on Flagship Species -- 13. References




Environmental Flows; Modelling; Biota

Publisher name

Northern Territory Government

Place of publication



Final Report


57/2002; National River health program


75 pages ; 30 cm

File type



Attribution International 4.0 (CC BY 4.0)

Copyright owner

Northern Territory Government



Parent handle


Citation address


Page content

44 (50%), no intermediate pools, 2 large pools (33%) and 1 very large pool (17%) (Figures 25 & 26). Under these flow conditions 7.5% (5.5 km) of the study reach would be fragmented into small pools, 23% (17.0 km) would be fragmented into large pools and 69% (51.2 km) would be fragmented into very large/continuous pools. Figure 25. Frequency of occurrence of the five pool length categories under simulated flow conditions in the Daly River, Northern Territory. Red bars represent small pools, green bars represent intermediate pools and blue bars represent large pools. Figure 26. Percent of the Daly River that fragmented into small, intermediate and large pool length categories. Only 7.5% percent of the Daly River fragmented into pools less than 2.5km long. The largest pool under this Low flow condition (31.7 km) extends from behind control point 18 to control point 5. The next largest pool (20.0 km) extends from behind control point 26 Cattle Creek to Control point 22, but this is continuous. The third largest pool (9.5) is the furthest upstream pool and it extended from behind control point 3 to Dorisvale crossing. The smallest substantial pool (1.7 km) extends from control point 3 to control point 4.