Drinking water Technology, Eawag, developed a method by which hazard maps could be produced for geogenic toxic substances in groundwater. This provides an efficient way of determining which wells should be tested. Parameters for drinking water quality typically fall within three categories: Physical and chemical parameters include heavy metals, trace organic compounds, total suspended solids (TSS), and turbidity. Microbiological parameters include Coliform bacteria, "E. coli", and specific pathogenic species of bacteria (such as cholera-causing "Vibrio cholerae"), viruses, and protozoan parasites. Chemical parameters tend to pose more of a chronic health risk through buildup of heavy metals although some components like nitrates/nitrites and
Smother crop thus providing green fertilizer. A good smother crop must compete strongly with weeds but minimally with the crop. Smother crops reduce dependence on chemical weed control. Some secondary benefits of such crops are helping nitrogen fixation in soil (if legumes are used) and reducing soil erosion. Alfalfa, rye, buckwheat, sorghum, Sudan grass, foxtail millet, sweetclover, clover and silage corn are some examples of smother crops. Smother crop A smother crop is a thick, rapidly growing crop that is used to suppress or stop the growth of weeds. Smother crops have better root systems that help them compete with weeds for