Dealing with salinity in Wheatbelt Valleys - Department of Water

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Hatton and Ruprecht Figure 1: Drainage Basins of Western Australia strongly influenced by the surface hydrology of wheatbelt valleys. The Avon drains through to the Swan. The Ninghan basin potentially drains into the Yarra Yarra, which potentially flows through to the Moore River. Figure 2: Mean annual rainfall isohyets for south-western Australia (from Pen 1999). – 2 –
Since the mid 1970s annual rainfall for areas such as Narrogin have had below average conditions (Figure 3). The number of wet years (Figure 4) has reduced significantly since the 1950s and since 1975 none has Annual rainfall (mm) 500 450 400 Hatton and Ruprecht occurred for the Avon River. The number of wet years, defined as above the 1-in-10 year average recurrence interval has also reduced significantly in the last 50 years (Figure 4). 350 1880 1890 1900 1910 1920 1930 1940 Year 1950 1960 1970 1980 1990 2000 Wet years (number) 6 5 4 3 2 1 0 10 year backward moving mean (greater than long term mean) 10 year backward moving mean (less than long term mean) Figure 3: Decadal variability in rainfall for Narrogin Post Office. Wet years defined as above 1-in-10 year annual recurrence interval 1900-1925 1925-1950 1950-1975 1975-2000 Figure 4: Wet years for the Narrogin Post Office in 25–year segments, based on annual rainfall. The Drainage Network The second distinctive feature of the Wheatbelt systems is the fact that their headwaters start out in an older landscape with remarkably low gradients, and the rivers do not steepen until they approach the younger parts of the system in the vicinity of the Meckering Line. The best and most recent treatments of the evolution of these rivers are in Salama (1994; 1997) and Beard (1999). The Lockhart-Pingrup River for instance, falls 51 m over – 3 – 200 km (0.00026) from Lake Chinocup (near Pingrup) to the Caroline Gap; while the Yilgarn River to the Avon River at Toodyay falls 345 m over 420 km (0.00082), and then falls 140 m over only 90 km (0.0023) from Toodyay to the coast at Fremantle (Beard 1999). Salama (1997) and Beard (1999) estimated mean grades of 0.35 m km –1 and 0.38 m km –1 respectively for the Yilgarn River from head of channel to the confluence with the Avon. A key feature of this grade, however, is that it is interrupted by large, essentially flat playas that drop
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Foreword Dealing with Salinity in W
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1Day one: Monday 30th July. Field t
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Papers Dealing with Salinity in Whe
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Ali and Coles biggest challenges fa
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Ali and Coles erosion, maintenance
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Ali and Coles expected under these
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Ali and Coles Coles, N.A. & Ali, M.
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Commander, Schoknecht, Verboom and
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Page 23 and 24: Commander, Schoknecht, Verboom and
Page 41 and 42: APPRECIATING AND CREATING OUR HISTO
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Page 49 and 50: 1990s, the wheatbelt valleys in par
Page 51 and 52: REFERENCES Agstats (1997). Agricult
Page 53 and 54: George and Coleman two to four fold
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Page 65 and 66: George and Coleman advantages of so
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Page 69 and 70: George and Coleman Venture Economy
Page 71 and 72: George and Coleman Lawrence, C. (19
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Page 77 and 78: Effect of clearing on runoff The ot
Page 79 and 80: Salinity Monthly streamflow (ML) 10
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Page 85 and 86: THE FUTURE In looking at the future
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Page 89 and 90: Keighery, Halse and McKenzie Terres
Page 91 and 92: Keighery, Halse and McKenzie Wetlan
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Page 97 and 98: Lloyd number of legal cases pending
Page 99 and 100: Lloyd 0 -500 -1000 -1500 -2000 -250
Page 101 and 102: Lloyd Table 3. Sheep grazing days i
Page 103 and 104: Lloyd Hectares project to provide w
Page 105 and 106: INTRODUCTION The Lake Chinocup Catc
Page 107 and 108: agriculture) in various stages, the
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Page 119 and 120: REFERENCES Dawes, W.R., Stauffacher
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Pannell Proposals to construct majo
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Pannell been conducted for the Cent
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Pannell investments in long-term la
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Pannell Pannell, D.J. (2001). Dryla
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Porter, Bartle and Cooper Table 1:
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Porter, Bartle and Cooper operation
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Porter, Bartle and Cooper Increase
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Porter, Bartle and Cooper support i
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Porter, Bartle and Cooper that is a
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CASE STUDY - TOOLIBIN LAKE AND CATC
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• The distribution, storage and m
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Secondly, there is a set of practic
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within three categories: relationsh
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CONCLUSIONS Actions to protect and
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FIELD TOUR LOCATIONS FIELD TOUR NOT
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COLES FARM “Avon River Basin Over
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Conference Outcomes Dealing with Sa
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with Salinity in Wheatbelt Valleys:
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with Salinity in Wheatbelt Valleys
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Photo Gallery 2 Dealing with Salini
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APPENDIX 1 BACKGROUND HYDROLOGY AND
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WHEATBELT HYDROLOGY Flow in the Yil
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Flow (ML) STREAM SALINITY Salt Rive
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APPENDIX 2 WATER MANAGEMENT OPTIONS
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APPENDIX 3 MANAGING WATER AND SALIN
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SUMMARY- TIMELINE OF RECENT SIGNIFI
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RECENT HISTORY OF WATER AND SALINIT
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Figure 1. Hydrological cross-sectio
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Depth (m) 316 315 314 313 312 311 M
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FURTHER INVESTIGATIONS AND MANAGEME
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Dealing with salinity in Wheatbelt Valleys - Department of Water

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