Refer to the Topographic Map extract and answer the questions that follow. 7.4.1 Name the type of river at A. 7.4.2 Explain the purpose of the human-made feature at B. 7.4.3 Name drainage patterns C and D. 7.4.4 Discuss the reasons for the development of the respective drainage patterns C and D. 7.4.5 Explain why the location of the Blyderivierpoort Dam is ideal.

Question 1

Answer · 2026-03-16T02:47:52.645Z

7.4.1 Arch dam 7.4.2 Drainage pattern of C: Dendritic Drainage pattern of D: Trellis 7.4.3 C (dendritic): Reason 1: Uniform underlying geology with similar resistance to erosion. Reason 2: Lack of structural control (horizontal strata). D (trellis): Reason 1: Alternating layers of hard and soft rock. Reason 2: Folded strata providing structural control. 7.4.4 Reason 1: Located in a narrow gorge (evident from closely spaced contours) which minimises construction costs and material required for the wall. Reason 2: Underlain by hard, impermeable bedrock which prevents water seepage/leakage.

Question 2

7.4.1 Arch dam 7.4.2 Drainage pattern of C: Dendritic Drainage pattern of D: Trellis 7.4.3 C (dendritic): Reason 1: Uniform underlying geology with similar resistance to erosion. Reason 2: Lack of structural control (horizontal strata). D (trellis): Reason 1: Alternating layers of hard and soft rock. Reason 2: Folded strata providing structural control. 7.4.4 Reason 1: Located in a narrow gorge (evident from closely spaced contours) which minimises construction costs and material required for the wall. Reason 2: Underlain by hard, impermeable bedrock which prevents water seepage/leakage.

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