Territory Stories

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

Details:

Title

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

Creator

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

Collection

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

Date

2002-11-20

Location

Daly River

Abstract

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.

Notes

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

Language

English

Subject

Environmental Flows; Modelling; Biota

Publisher name

Northern Territory Government

Place of publication

Palmerston

Edition

Final Report

Series

57/2002; National River health program

Format

75 pages ; 30 cm

File type

application/pdf

Use

Attribution International 4.0 (CC BY 4.0)

Copyright owner

Northern Territory Government

License

https://creativecommons.org/licenses/by/4.0/

Parent handle

https://hdl.handle.net/10070/885434

Citation address

https://hdl.handle.net/10070/885435

Page content

43 Dorisvale Crossing and is 24.2 km upstream from the second largest pool. These three pools and the continuous section of river below Jinduckin Creek are likely to be the main refuges for riverine biota under extreme low flow conditions. The smallest substantial pool (1.2 km) extends from control point 18 to control point 19. The corresponding morphology for each of the three pool size classes are presented in Table 11. Apart from length, their profiles were very similar, a reflection of the relatively common morphology of the river across the study site. Table 11. Morphological parameters for pools among 3 pool size classes. Means are given with standard deviations. Size Class Length (m) Flow area (m2) Top width (m) Wetted perimeter (m) Maximum depth (m) Small 1.70.3 (1.2-2.0) N=6 98.321.5 (76.6-135.5) N=6 60.71.3 (59.1-62.4) N=6 61.41.4 (59.7-63.0) N=6 2.10.3 (1.8-2.7) N=6 Intermediate 4.41.6 (3.3-5.6) N=2 84.33.1 (82.1-86.5) N=2 61.00.4 (60.7-61.3) N=2 61.50.3 (61.3-61.7) N=2 1.90.1 (1.8-1.9) N=2 Large 12.24.1 (9.5-16.8) N=3 83.710.4 (73.4-94.1) N=3 59.81.1 (58.8-61.0) N=3 60.31.2 (59.2-61.5) N=3 1.80.2 (1.7-2.0) N=3 60% Reduction (10.5 cumecs) When 10.5 cumecs occur at Dorisvale Gauging Station, 7 breaks occur in the Daly River between Dorisvale Crossing and Cattle Creek (Table 12). This translates into one break point for every 10.53 km of river. Table 12. Location of breakpoints on the Daly River under modelled flow conditions. Upstream flow was 10.5 cumecs at Dorisvale Crossing and downstream flow was 17.0 cumecs at Cattle Creek. Breakpoints refer to sections of the river that would inhibit movement of pig-nosed turtles (<0.5 m). Landmark Distance (km) Easting Northing Pool length (km) Cp1 Dorisvale 0.00 775734 8410582 0.00 Cp3 9.46 770965 8415100 9.46 Cp4 11.17 769734 8416517 1.71 Cp5 13.20 767888 8416689 2.03 Cp18 44.87 750816 8432984 31.67 Cp19 46.67 749665 8431792 1.80 Cp22 54.17 747717 8437410 7.50 *Cp26 73.70 738867 8445392 >19.54 *Maximum depth greater than 0.5m Under this flow condition (10.5 cumecs), the 7 break points identified above produce 6 pools in the Daly River, between Dorisvale Crossing and Cattle Creek. There were 3 small pools


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