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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.
Geography
ScanSolve AI Answer
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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