Skills for Study Level 2 Teacher's Book - Cambridge University Press

water sources is that considerable time and effort must be spent collectingthe water. The time that is lost might instead have been put to more profitableeconomic or educational use (Hutton and Haller, 2004), and therefore lack ofaccess to water is not just a symptom of poverty, but may in fact perpetuate it 2 .Rainwater harvesting (i.e. collecting rainwater in tanks on the rooftop of afamily home), is one potential method of increasing supplies of domesticdrinking water. However, freshly fallen rainwater may often be contaminated bysuch things as chemicals in the atmosphere, dust blown onto the water whenit settles on the rooftop, or even bird droppings (Marston, 2006). Consequentlythe water must be sterilized before use 1 . Two possible methods of sterilizationare pump filtering, or sterilization by exposure to direct sunlight 4 . This reportcompares the two methods in order to recommend a system that is suitable foruse in poor rural communities in the developing world 3 .8bAnswersAppendix 4• Groundwater reuse and large-scale seawater desalination.• Options are mentioned briefly in the introduction, then in more detail in theseparate section ‘Options for increased water supply in arid regions’.Appendix 5• Desalination and reuse of treated waste water.• Options are mentioned briefly in the introduction. The options are thenoutlined in more detail as part of the ‘Background’ section.9 Feasibility/recommendation reports – requirements9aAnswersmust, should / should not, can, will / will not.Should occurs most frequently.9bAnswersAppendix 4The requirements are explained, to an extent, in the introduction andbackground sections. The author points out that there is a need for a reliable,sustainable water source.Appendix 5The requirements are explained in the background section.10 Feasibility/recommendation reports – comparison/evaluationof options10aAnswersExample A: the three different options (tap water, vending machine andwater cooler) are evaluated individually, with different features discussedfor each one.Example B: this is divided into sections for the features (cost, acceptability andease of supply) and each section compares the three options on that feature.Unit 2 Part E ∙ Reporting in writing 72