3.2.3 Longer-term surface trends The length of recorded data at most gauging stations in the Lake Eyre Basin is short relative to the inter-annual variation that occurs. This, and gaps in the recorded data from some stations, limit the identification of long-term changes in river flows (refer to Appendix 1 for location of gauging stations). The gauging station at Cullyamurra on Cooper Creek has been operating for a relatively long time (since 1973) and this 43-year record demonstrates the very high variability typical of Basin rivers (Figure 7). The hydrograph at this gauging station is dominated by large flood events and does not exhibit any significant trend in annual streamflow over time. Nor can hydrologic models be used to identify changes in runoff and streamflow in the Basin for similar reasons, i.e. insufficient duration of records for model calibration and high levels of uncertainty in model outputs. Figure 7. Hydrograph of Cooper at Cullyamurra gauging station showing daily discharge in megalitres per day between 1973 and 2015.
3.2.3 Longer-term surface trends The length of recorded data at most gauging stations in the Lake Eyre Basin is short relative to the inter-annual variation that occurs. This, and gaps in the recorded data from some stations, limit the identification of long-term changes in river flows (refer to Appendix 1 for location of gauging stations). The gauging station at Cullyamurra on Cooper Creek has been operating for a relatively long time (since 1973) and this 43-year record demonstrates the very high variability typical of Basin rivers (Figure 7). The hydrograph at this gauging station is dominated by large flood events and does not exhibit any significant trend in annual streamflow over time. Nor can hydrologic models be used to identify changes in runoff and streamflow in the Basin for similar reasons, i.e. insufficient duration of records for model calibration and high levels of uncertainty in model outputs. Figure 7. Hydrograph of Cooper at Cullyamurra gauging station showing daily discharge in megalitres per day between 1973 and 2015.
state-basin-condition-assessment-2016-3.docx