Dealing with salinity in Wheatbelt Valleys - Department of Water

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Photo Gallery 3 Dealing with Salinity in Wheatbelt Valleys Processes, Prospects and Practical Options Photos courtesy of Colin Terry to view the full slide show click here BACK QUIT NEXT
APPENDIX 1 BACKGROUND HYDROLOGY AND SALINITY NOTES FOR WHEATBELT TOUR by John Ruprecht and Peter Muirden (Water and Rivers Commission) The Swan and Avon Rivers have a large catchment area of 125,000 km² which stretches from Dalwalinu in the north, Southern Cross in the north east and Lake King in the south east down to the mouth at Fremantle. Most of the catchment area to the mouth of the Swan (73 %) is upstream of Yenyening Lakes (east of Beverley) which is made up of an ancient and very flat landform called the Yilgarn System. The Yilgarn System is likely to have originally flowed out into the Southern Ocean in a series of rivers including the Gairdner, Fitzgerald and Phillips. Following a rise in landform on the South Coast, the whole system now flows out to the west and into the Avon River through the Caroline Gap south of Kellerberrin. This gap is located just downstream of the confluence of the Lockhart and Yilgarn Rivers, where they join to become the Salt River flowing southwest through the Yenyening Lakes and out into the Avon River. The north of the Yilgarn System is drained by the Yilgarn River which originates north-east of Southern Cross with Lake Seabrook and Lake Deborah, but with tributaries to the north and south-east. It flows in a south-westerly direction past Merredin to its confluence with the Lockhart River south of Kellerberrin. Its catchment area is 55,900 km². In the south of the Yilgarn system, the land is drained by three major rivers which join south of Kondinin into the Lockhart River an which have a total catchment area of 32,400 km²: • the mainstream Lockhart River originates at Lake Magenta and winds its way northwest to Newdegate, Kondinin, Corrigin and Bruce Rock, before joining the Yilgarn River south of Kellerberrin. • the Camm River to the east draining from Lake King through Hyden to Kondinin where it meets the Lockhart River. • The Pingrup River which arises near Lake Cairlocup and flows North to Lake Grace and the Lockhart River. • Flows have been measured in the Yilgarn and Lockhart Rivers since 1976 and contrary to popular belief flow occurs every year (although some years the flow is very small). For instance, on the Lockhart River, the annual flow was in excess of 10 GL in seven out of the 25 years of record, while in 10 years it was less than 1 GL. The Avon River itself, originates at Yealering and upstream of the confluence with the Salt River at Yenyening Lakes has a catchment area of 3,200 km². From there it flows past Beverley, York and Northam before the confluence with the Mortlock River. Excluding the Salt River (Yenyening) catchment (91 500 km²) the Avon River at Northam is 8 100 km² while the Mortlock River adds a further
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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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APPRECIATING AND CREATING OUR HISTO
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services. The Government responded
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WHEATBELT VALLEYS IN DIFFICULTIES T
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argue that they were really abnorma
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1990s, the wheatbelt valleys in par
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REFERENCES Agstats (1997). Agricult
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George and Coleman two to four fold
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George and Coleman surface, the vas
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George and Coleman for example in t
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George and Coleman current trends c
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George and Coleman While not as div
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George and Coleman SPECIES Table 5:
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George and Coleman advantages of so
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George and Coleman this volume). In
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George and Coleman Venture Economy
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George and Coleman Lawrence, C. (19
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Hatton and Ruprecht WATCHING THE RI
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Since the mid 1970s annual rainfall
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Effect of clearing on runoff The ot
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Salinity Monthly streamflow (ML) 10
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The ratio of the salt outputs to in
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- 11 - Hatton and Ruprecht Table 4:
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THE FUTURE In looking at the future
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McFarlane, D.J., George, R.J. & Far
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Keighery, Halse and McKenzie Terres
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Keighery, Halse and McKenzie Wetlan
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Keighery, Halse and McKenzie specie
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Keighery, Halse and McKenzie enviro
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Lloyd number of legal cases pending
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Lloyd 0 -500 -1000 -1500 -2000 -250
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Lloyd Table 3. Sheep grazing days i
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Lloyd Hectares project to provide w
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INTRODUCTION The Lake Chinocup Catc
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agriculture) in various stages, the
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- 3,477 ha of remnant vegetation or
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Scientists talk of up to 30% of the
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6320000 6300000 6280000 6260000 624
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Although the waterlogged area under
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eliminates drainage through the nex
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REFERENCES Dawes, W.R., Stauffacher
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Pannell ECONOMICS, SOCIETY AND ENVI
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Pannell • the area of land protec
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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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Page 149 and 150: CASE STUDY - TOOLIBIN LAKE AND CATC
Page 151 and 152: • The distribution, storage and m
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Page 157 and 158: CONCLUSIONS Actions to protect and
Page 159 and 160: FIELD TOUR LOCATIONS FIELD TOUR NOT
Page 161 and 162: COLES FARM “Avon River Basin Over
Page 163 and 164: Conference Outcomes Dealing with Sa
Page 165 and 166: with Salinity in Wheatbelt Valleys:
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Page 197: Photo Gallery 2 Dealing with Salini
Page 201 and 202: WHEATBELT HYDROLOGY Flow in the Yil
Page 203 and 204: Flow (ML) STREAM SALINITY Salt Rive
Page 205 and 206: APPENDIX 2 WATER MANAGEMENT OPTIONS
Page 207 and 208: APPENDIX 3 MANAGING WATER AND SALIN
Page 209 and 210: SUMMARY- TIMELINE OF RECENT SIGNIFI
Page 211 and 212: RECENT HISTORY OF WATER AND SALINIT
Page 213 and 214: Figure 1. Hydrological cross-sectio
Page 215: Depth (m) 316 315 314 313 312 311 M
Page 218 and 219: FURTHER INVESTIGATIONS AND MANAGEME
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