Page 161 - VEWH Seasonal Watering Plan 2020-21
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Table 4.3.1 Potential environmental watering actions and objectives for the Wimmera system (continued)
4.3 Wimmera system
 Potential environmental watering action
  Functional watering objectives
  Environmental objectives
 Summer/autumn fresh (two to four freshes of five to
50 ML/day for two to seven days during December to May)
• Provide variable flows in the low-flow season for fish movement
• Maintain water quality and increase habitat availability for waterbugs and platypus
                  Winter/spring fresh (five freshes of 55 ML/day for two to seven days during June to November)
    • Stimulate and facilitate fish and platypus movement by increasing flow rates and water depth
• Maintain water quality and improve habitat quality for waterbugs
• Maintain soil moisture for streamside vegetation and a near-permanent wetted stream channel for aquatic vegetation
• Prevent the growth of terrestrial plants in the stream bed
                MacKenzie River (reach 3)
    Year-round low flow (10 ML/ day or natural, year-round)
  • Maintain edge habitats and deeper pools and runs for waterbugs
• Maintain soil moisture for streamside vegetation and a near-permanent wetted stream channel for aquatic vegetation
• Prevent the growth of terrestrial plants in the stream bed
• Maintain pool habitat for native fish and crayfish populations
• Facilitate the dispersal of juvenile platypus into the Wimmera River during autumn/winter
           Summer/autumn freshes (three to four freshes of 35 ML/day for two to seven days each during December to May)
 • Provide variable flows in the low-flow season for fish movement
• Maintain water quality and increase habitat availability for waterbugs
           Small winter/spring fresh (one to five freshes of 35 ML/day for two to seven days during June to November)
    • Stimulate fish movement by increasing flow rates and water depth and increase habitat availability for platypus and waterbugs
• Maintain water quality
• Maintain soil moisture for streamside vegetation and a near-permanent wetted stream channel for aquatic vegetation
                  Large winter/spring fresh (one fresh of 190 ML/day for one to two days during June to November)
      • Disturb biofilms present on rocks or woody debris, to stimulate new growth and provide food for waterbugs
• Maintain water quality
• Maintain soil moisture for streamside vegetation and a near-permanent wetted stream channel for aquatic vegetation
• Stimulate fish movement by increasing flow rates and water depth and increase habitat availability for platypus
               Victorian Environmental Water Holder | Seasonal Watering Plan 2020–21 | 159
 
































































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