Nevertheless, seeding can be worth while. The benefit—cost ratio of appropriate seeding in wheat areas may be 3-4, in terms of extra crop yield, and the financial benefit of the extra rainfall onto catchments of hydroelectric-power schemes in Tasmania is several times the cost of seeding. Figure 9—3 shows an extra 20-40 per cent of rainfall in the targeted area.
Cloud seeding has been carried out for drought relief in New South Wales and for inducing rain to lower the bushfire hazard in Victoria. Also, cloud seeding has been tried in Russia for hail reduction (Section 9.8). In addition, it has been tried off Florida in experiments on defusing hurricanes; the hope is to induce precipitation and thus create stirring which can remove the atmospheric instability energising the hurricane. Unfortunately, the hail-reduction experiments proved unimpressive, and practical difficulties of experiments within the violence of hurricanes make it hard to demonstrate success there.
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