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

42 no very large pools. There were 6 small pools (55%), 2 intermediate pools (18%) and 3 large pools (27%) (Figures 23 & 24). Under these flow conditions 14.2% (10.5 km) of the study reach would be fragmented into small pools, 12.1% (8.9 km) would be fragmented into intermediate pools and 49.5% (36.5 km) would be fragmented into large pools. There were no breakpoints between Jinduckin Creek and Cattle Creek leaving 17.8km of continuous river at the bottom end of our study area. Figure 23. 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 24. Percent of the Daly River that fragmented into small, intermediate and large pool length categories. Only 14% percent of the Daly River, fragmented into pools, which were less than 2.5km long. The largest pool under this Low flow condition (16.8 km) extends from behind control point 15. The next largest pool (10.2 km) extends from behind control point 17 to control point 15. These two pools are separated only by the shallow depth at control point 15 km. The third largest pool (9.5) is the furthest upstream pool and it extended from behind control point 3 to