Table 8.1 Limits of acceptable change in the ecological character of Lake Albacutya (see Explanatory Notes below #) Critical Baseline condition and range of natural Limits of acceptable change Basis for Confidence parameter variation determination level Short term (0 10 years) Medium term (25 to 50 years) – Critical components and processes Morphology - The lakebed is comprised of a suitable Attribute retained without As for short term. Expert opinion. High substrate enabling it to hold water for significant change as a result of lakebed extended periods to depths of over 6 m human interference. when full, while allowing some seepage to recharge the groundwater aquifer. The single natural inlet creek allows Attribute retained without High As for short term. unimpeded flows from . significant change as a result of human interference. The sill of the single natural discharge Attribute retained without High As for short term. creek allows water to accumulate in the significant change as a result of lake to a depth of over 6 m. human interference. The lake margins have an elevation Attribute retained without High As for short term. significantly higher than the discharge creek significant change as a result of bed human interference. The average return period for Hydrology Lake Albacutya fills intermittently from river Not applicable Expert opinion Low flows from the upper catchment, and once and shallow floods of at least nine full, holds water for several years. Modelling documented months duration will be no more literature - of natural conditions indicates that the than eight years. Ecological Medium recurrence interval for 6 months Associates, duration overflow events is 6 years, and The average return period for 2004. for 24 months duration overflow events of 24 months overflow events is 10 years. duration will be no more than 20 years.
Table 8.1 Limits of acceptable change in the ecological character of Lake Albacutya (see Explanatory Notes below #) Critical parameter Baseline condition and range of natural variation Limits of acceptable change Basis for determination Confidence level Short term (0 – 10 years) Medium term (25 to 50 years) Critical components and processes Morphology - lakebed The lakebed is comprised of a suitable substrate enabling it to hold water for extended periods to depths of over 6 m when full, while allowing some seepage to recharge the groundwater aquifer. The single natural inlet creek allows unimpeded flows from . The sill of the single natural discharge creek allows water to accumulate in the lake to a depth of over 6 m. The lake margins have an elevation significantly higher than the discharge creek bed Attribute retained without significant change as a result of human interference. Attribute retained without significant change as a result of human interference. Attribute retained without significant change as a result of human interference. Attribute retained without significant change as a result of human interference. As for short term. As for short term. As for short term. As for short term. Expert opinion. High High High High Hydrology Lake Albacutya fills intermittently from river flows from the upper catchment, and once full, holds water for several years. Modelling of natural conditions indicates that the recurrence interval for 6 months duration overflow events is 6 years, and for 24 months duration overflow events is 10 years. Not applicable The average return period for shallow floods of at least nine months duration will be no more than eight years. The average return period for overflow events of 24 months duration will be no more than 20 years. Expert opinion and documented literature - Ecological Associates, 2004. Low Medium
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