Fig. 1 shows a desert road crossing a wadi in Oman. It is dry for most of the year, but local residents reported that it filled rapidly after a storm in the...

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

Question 1 Report

9230-p1-hotdesert-07-wadi-road

Fig. 1 shows a desert road crossing a wadi in Oman. It is dry for most of the year, but local residents reported that it filled rapidly after a storm in the mountains. Table 1 gives rainfall measured at two stations during the same storm. The road engineer is assessing flash-flood risk.

StationRainfall in 2 hours (mm)Distance upstream (km)
Mountain station5724
Wadi crossing60

(a) Which station recorded the greater rainfall total? [1]
(b) Outline why the road at the wadi crossing may flood even when little rain falls there. [2]
(c) Draw a warning sign position on Fig. 1 where drivers should stop before entering the channel. [1]

Answer Details

(a) Mountain station [1] (b) Heavy rain falls upstream/in the mountains [1]; runoff travels down the wadi and concentrates at the crossing [1]. (c) Warning sign placed on either road approach before the low channel crossing [1]

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