Table 1 gives measurements from a school investigation of infiltration on two surfaces near a hot desert town in Arizona. Fig. 1 shows the two test plots af...

Assessment: Geography 9230 | Paper 1 Mock 01 | Written Paper 1 Subject: Geography - 9230

Question 1 Report

9230-p1-hotdesert-12-infiltration-plots

Table 1 gives measurements from a school investigation of infiltration on two surfaces near a hot desert town in Arizona. Fig. 1 shows the two test plots after the same short rainfall event. Plot A has compacted ground beside a car park, whereas Plot B has loose sandy soil with shrubs.

PlotWater infiltrated in 10 minutes (mm)Surface runoff after 10 minutes (mm)
A, compacted ground215
B, sandy soil115

(a) Which plot has the greater surface runoff? [1]
(b) Outline why compacted ground can increase flash-flood risk. [2]
(c) Draw arrows on Fig. 1 to show surface runoff on Plot A. [2]

Answer Details

(a) Plot A [1] (b) Compaction reduces pore spaces/infiltration [1]; more water flows over the surface quickly into channels [1]. (c) Two arrows downslope/across the compacted Plot A towards a lower edge/channel [2]

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