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defluoridationremoval of excess fluoride from water (5) |
diffuse pollutionpollution from non-point sources (4) |
diffusionprocess by which something moves
naturally from a region of high concentration to one of low concentration (11) |
disease outbreakunexpected rise in the number of
cases of a disease (14) |
disinfectionelimination of micro-organisms that
can cause disease (5) |
distribution mainspipes that take water from a service
reservoir to other areas for use (1) |
drinking water laddersteps in improvement of quality of
water supply (3) |
drinking water standardsset of limits for the amounts of
specified substances in drinking water (9) |
drip-feed irrigationform of irrigation where water is put
at the base of a plant, using narrow pipes (1) |
droughtlack of rain that lasts for a long
period of time (14) |