Logging and development have encroached on catchment areas, reducing their capacity to retain rainwater.
These have traditionally played the role of water-catchment areas, absorbing any overflow from the river.
With torrential rain in Bangladesh and in the rivers' catchment areas in India, the annual deluge has begun.
Employers find they can often recruit cheaper and better employees as telecommuters by going outside their normal catchment areas.
It will replace St Sampson's secondary, and help prepare for the redrafting of catchment areas when St Peter Port School closes.
BBC: NEWS | Europe | Guernsey | Residents air school road worries
Soil erosion in the catchment areas leads to the silting of river beds, which soon offsets the protective value of embankments.
Two weeks ago parents in the La Houguette and Vauvert catchment areas were asked to consider alternative schools as places were oversubscribed.
Catchment areas are particularly pertinent when a school is in high demand.
Guernsey's Director of Education, Alan Brown, said about 17 children needed to move from their first choice due to over capacity in their catchment areas.
It is popularly believed that education laws passed by the previous government abolished rigid catchment areas and gave parents the right to choose where their children go to school.
Among his recommendations: improving protection of catchment areas, implementing a national water policy, replacing the creaky pipes that carry the precious liquid to people's homes, and making wasters pay more for water.
Brighton and Hove council introduced a system that uses a ballot as a tie-break in determining places in its eight secondary schools - with a particular problem in two catchment areas which each have two secondary schools very close to one another.
Even relatively water-rich countries of the region, such as Malaysia, Indonesia, Bhutan and Papua New Guinea, now face water supply and quality constraints in their major cities because of population growth, growing water consumption, environmental degredation, damaging agricultural activities, poor management of water catchment areas, industrialization, and groundwater overuse.
Critics have warned that any new law could end up being used more widely than originally intended - similar to the controversial Regulation of Investigatory Powers Act, which has not just been used to tackle serious crime by police but also been used by local authorities to check on children's school catchment areas.
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