P1 Hydrological regime Short Term Wetland wetting frequency, flushing frequency and flushing Refer to LAC for details. LAC have been identified for C1 C8 – – Medium Term volume are maintained as follows: Values measured at these wetlands on the basis S1, S2 existing gauging stations that they are the best in the lower reaches of indicators of freshwater flows the Rivers or otherwise in into the broader system. the wetlands themselves. Level C - LAC based on Tilleard and Ladson (2010) to ‘Hydrological Analyses Support Determination of Environmental Water Requirements in the This is ’. a threshold-based LAC that is based on modeling and ecological assessments. Note that these values should be From Tilleard and Ladson (2010); note that larger flushing considered as indicative only volumes (~20GL) are identified as being needed for Dowd and the at this stage, and should be Heart Morasses following saline flood events in the Lake constantly reviewed. Wellington system (for example, when the wetlands are filled with Tilleard and Ladson (2010) saline water from Lake Wellington and this corresponds with low indicate no work has been flows in the Latrobe River). done for wetlands on the Mitchell (Macleod Morass); McLennan Straits ( , ); or . P2 Waterbird breeding Short Term Abandonment or significant decline (greater than 50 per cent) in Recommended baseline Level C - The use of the site C6 the productivity of two or more representative breeding sites monitoring program by these species is well (based on two sampling episodes over a five year period) within should comprise a documented. However, there any of the following site groupings: minimum two annual are no empirical data sampling periods describing breeding rates. , and - Australian pelican. separated by at least one Baseline data will need to be Bunga Arm and little tern and fairy tern. – year (and within a 5 year collected to assess this LAC. Macleod Morass, Sale Common and Dowd Morass black – period). swan, Australian white ibis, straw-necked ibis, and little black cormorant. Critical Services/Benefits
P1 Hydrological regime Short Term – Medium Term Wetland wetting frequency, flushing frequency and flushing volume are maintained as follows: From Tilleard and Ladson (2010); note that larger flushing volumes (~20GL) are identified as being needed for Dowd and the Heart Morasses following saline flood events in the Lake Wellington system (for example, when the wetlands are filled with saline water from Lake Wellington and this corresponds with low flows in the Latrobe River). Refer to LAC for details. Values measured at existing gauging stations in the lower reaches of the Rivers or otherwise in the wetlands themselves. LAC have been identified for these wetlands on the basis that they are the best indicators of freshwater flows into the broader system. Level C - LAC based on Tilleard and Ladson (2010) ‘Hydrological Analyses to Support Determination of Environmental Water Requirements in the ’. This is a threshold-based LAC that is based on modeling and ecological assessments. Note that these values should be considered as indicative only at this stage, and should be constantly reviewed. Tilleard and Ladson (2010) indicate no work has been done for wetlands on the Mitchell (Macleod Morass); McLennan Straits ( , ); or . C1 – C8 S1, S2 P2 Waterbird breeding Short Term Abandonment or significant decline (greater than 50 per cent) in the productivity of two or more representative breeding sites (based on two sampling episodes over a five year period) within any of the following site groupings: , and - Australian pelican. Bunga Arm and – little tern and fairy tern. Macleod Morass, Sale Common and Dowd Morass – black swan, Australian white ibis, straw-necked ibis, and little black cormorant. Recommended baseline monitoring program should comprise a minimum two annual sampling periods separated by at least one year (and within a 5 year period). Level C - The use of the site by these species is well documented. However, there are no empirical data describing breeding rates. Baseline data will need to be collected to assess this LAC. C6 Critical Services/Benefits
21-ecd-ch-4-5.docx