Fig. 6.1 shows information about four drainage basins which provide most of the water supply for the state of California, USA.

1. (a)(i)Which one of the four drainage basins has: the largest annual precipitation the smallest volume of annual runoff?[2]
2. (a)(ii)Using information from Fig. 6.1, decide which one of the following statements is true. Tick (✔) one box. | | tick (✔) | |---|---| | Irrigation will be most needed in the north. | | | Surface water supply will be used most in the east. | | | Irrigation will be most needed in the south. | | | Groundwater will be used most in the north. | |[1]
3. (b)Fig. 6.2 shows the water use and population of California.
4. (b)(i)What was the population of California in 1990? million[1]
5. (b)(ii)How much water was used for agriculture in 1980? billion m³[1]
6. (c)Fig. 6.3 provides more information about water supply in California. Using Fig. 6.3, suggest which one of the following statements is true. Tick (✔) one box. | | tick (✔) | |---|---| | Cost will be a problem if desalinated water is used for agriculture. | | | Groundwater is the main source used in California. | | | Recycled water is of high quality. | | | Surface water is not important to California. | |[1]
7. (d)Suggest two possible environmental impacts of uncontrolled pumping of groundwater for use in irrigation. 1 2[2]

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.