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Category Archives: Dragonfly
Macro-invertebrate Sampling: Spring 2006
This is the third time that macro-invertebrates have been sampled in the Majura Dams as part of Project Dragonfly. They were first sampled in spring 2005 to provide a benchmark against which future samples could be compared. As well as our first dragonfly nymph, we found quite a variety of other [...]
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Dam dimensions
Dimensions of the dams as measured in May 2005
Lower dam:
Long axis 53m, short axis 37m – approximated to a circle of diameter 45m
Radius = 23m
Circumference = 145m
Water surface area = 1660sqm
Deepest point = 2m
Volume = 1/3 area x depth = 1000 m3
Average filter zone width = 3m
Filter zone area = ((radius + fz width) 2 [...]
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Dragonfly: first planting
Our first planting day was held on the 9th of October. It was a great success and we’d like to thank all of those people who put in many hours to get the plants in. About 9300 plants in total were planted. We were also helped by a group of Australian [...]
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Macro-invertebrate sampling: Autumn 2006
Macro-invertebrates were sampled in spring 2005 to provide a benchmark against which future samples could be compared. As well as our first dragonfly nymph, we found quite a variety of other macro-invertebrates including water boatmen (true bugs), mayfly nymphs, caddisflies, midge larvae, yabbies and freshwater shrimp. See the earlier report for more detail.
We sampled again [...]
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Water quality
The water quality of both dams is being monitored by ACT Parks & Conservation. Monthly data will be collected over the 18 months of the project to measure how revegetation of the dams affects the water quality.Upper Dam
Date
07/09/05
13/10/05
Time
13:20
09:20
Air Temp (deg C)
18
17
Water temp (deg C)
16
16
Dissolved Oxygen (DO)
11.8
9.8
DO % Saturation
140
98
Orthophosphates (mg/L)
0.02
0.05
pH
8.2
9.5
Turbidity (NTU)
35
35
Electrical Conductivity
68
74
Lower Dam
Date
07/09/05
13/10/05
Time
13:45
09:45
Air [...]
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Macro-invertebrate Sampling Autumn 2006
Macro-invertebrates were sampled in spring 2005 to provide a benchmark against which future samples could be compared. As well as our first dragonfly nymph, we found quite a variety of other macro-invertebrates including water boatmen (true bugs), mayfly nymphs, caddisflies, midge larvae, yabbies and freshwater shrimp. See the earlier report [...]
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Second planting day
Our second planting was held on the 20th and 27th of October. About 3000 plants in total were planted mainly in the dryer eroded areas around the dams. FOMM members and volunteers were helped by ACT Parks and Conservation rangers and Warren Saunders of Seeds and Plants Australia.
For more information please email dragonfly@majura.org.
Following is a [...]
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Photographs
Blue Gum Water Watch
Planting Day: 9 October 2005 (Steve Bittinger)
Planting Day: 9 October 2005
Photo Points: for monitoring
Trial planting day: 25 September 2005
August 2005 (high water levels)
May 2005 (low water levels)
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About the dams
The dams are located along a gully in the drainage line between Mt Majura and Mt Ainslie. Overflow from the higher of the two dams flows into the lower dam, overflow from the lower dam flows into the Hackett stormwater system, and eventually into Sullivans creek. Although Mount Majura was originally part of a sheep [...]
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