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Glenelg River Human Impacts

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Glenelg River Human Impacts

Read the field briefing, then use evidence to identify human impacts and recommend a practical response. The figures below are simplified classroom data, not official monitoring results.

Field briefing: a river under pressure

The Glenelg River flows through south-western Victoria and into South Australia before reaching the sea. Its freshwater habitats support native fish, frogs, waterbirds and river plants. People also rely on the river for farming, recreation and local communities. Several pressures can affect river health. Water taken for irrigation may reduce flow, especially during dry periods. Clearing plants along the banks can leave soil exposed; rain then washes sediment into the river. Town surfaces such as roads and roofs direct stormwater into drains, which may carry litter, fertilisers and other pollutants. Boats, camping and fishing can disturb wildlife or damage riverbank vegetation if people leave rubbish or use sensitive areas carelessly. These pressures do not affect every place in the same way. Rainfall, river flow, land management and the location of activities all matter. Good decisions use evidence and consider both ecological health and community needs.

Evidence station: compare two sites

A student team sampled two fictional sites during the same week. Site A has a wide strip of native plants beside the river. Site B is beside cleared grazing land. These results are invented for this activity.

Measure

Site A: vegetated bank

Site B: cleared grazing land

Water clarity (1 = very cloudy; 5 = very clear)

Bank erosion observed

Low

High

Native plant cover along bank

Mostly continuous

Patchy

1.Which site had clearer water, and what two observations in the table support a possible link between bank vegetation and river condition?

2.Complete this chain using the field briefing: clearing bank plants → exposed soil → → a likely effect on aquatic habitat.

3.After heavy rain, a drain beside a new housing area empties into a creek that joins the Glenelg River. Which explanation best describes a possible impact?

Stormwater can carry litter and pollutants from hard surfaces into waterways.
Housing automatically increases native fish numbers.
Rainwater entering a drain cannot affect river water quality.
The drain will stop all sediment from reaching the river.

4.Match each human activity to its most direct possible pressure on the river.

Taking river water for irrigation
Removing bank vegetation
Leaving rubbish at a campsite

More erosion and sediment
Reduced river flow
Pollution and possible harm to wildlife

5.True or false: The comparison between Sites A and B proves that grazing caused all the differences in water clarity and erosion. Explain your choice.

6.During a dry season, less water remains in a river reach after water is taken for irrigation. Describe two possible ecological consequences.

7.In the Site A and Site B table, name one recorded observation and one inference a student could make from it.

8.Choose one pressure from the briefing and recommend a realistic action to reduce it. Explain who could help and how you would tell whether the action worked.

9.Suggest one way to improve the student team's comparison so it gives stronger evidence about bank vegetation and water condition.