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

41 The corresponding morphology for each of the three pool size classes is presented in Table 9. Apart from length, their profiles were very similar, a reflection of the relatively common morphology of the river across the study site. Table 9. 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 1.60.4 (1.0-2.0) N=11 75.520.5 (43.8-113.2) N=11 58.03.0 (53.5-62.7) N=11 58.53.1 (53.8-63.0) N=11 1.70.3 (1.2-2.3) N=11 Intermediate 5.11.2 (3.3-6.3) N=5 83.317.2 (58.3-100.8) N=5 59.52.2 (55.7-61.2) N=5 60.02.3 (56.0-61.6) N=5 1.80.3 (1.4-2.1) N=5 Large 10.21.0 (9.2-11.1) N=3 81.611.6 (68.7-91.3) N=3 59.41.5 (57.8-60.8) N=3 59.81.6 (58.1-61.3) N=3 1.80.2 (1.6-2.0) N=3 70% Reduction (7.6 cumecs) When 7.6 cumecs of flow occurs at Dorisvale Gauging Station, 12 breaks occur in the Daly River between Dorisvale Crossing and Cattle Creek (Table 10). This translates into one break point for every 6.14 km of river. Table 10. Location of breakpoints on the Daly River under modelled flow conditions. Upstream flow was 7.6 cumecs at Dorisvale Crossing and downstream flow was 12.8 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 Riffle 16.54 765700 8418696 3.34 Cp15 B B yard 33.38 758756 8430438 16.84 Cp17 43.62 751885 8433540 10.25 Cp18 44.87 750816 8432984 1.24 Cp19 46.67 749665 8431792 1.80 Cp20 48.62 749081 8433494 1.95 Cp22 54.17 747717 8437410 5.55 Cp23 Jinduckin 55.91 746875 8437186 1.74 *Cp26 73.27 738867 8445392 >17.80 *Maximum depth greater than 0.5m Under these flow conditions (7.6 cumecs), the 12 break points identified above produce 11 pools in the Daly River, between Dorisvale Crossing and Cattle Creek. Notably there were


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