标题：Water Quality Assessment of Various forms of Rainwater and Statistical Studies on Physico-Chemical Characteristics of Stormwater in Coimbatore, India
摘要：Rain water harvesting, irrespective of the technology used, essentially means harvesting and storing waterin days of abundance, for use in lean days. It has been construed as the most sustainable method formanaging water scarcity situations, incorporating all type of water demands. Though rainwater is consideredas a contamination free source, human activities particularly in the industrial and agricultural sectors pollutethis pure form of water. The quality of various forms of rainwater, viz. direct rainfall, rooftop water andstormwater were assessed by analysing various physico-chemical parameters. The physico-chemicalcharacteristics of stormwater were further subjected to statistical and correlation analyses. The resultsshowed that the direct rainwater samples collected were pure and safe as drinking water. The surfacestormwater runoff samples collected from the study location, which is mainly an urban and industrialisedcatchment, contained undesirable amount of sediment load and other chemical parameters; most of themare not within safe limits for drinking and irrigation use. The electrical conductivity and sediment concentrationin samples collected from roofs were slightly above the desirable limit for drinking purpose. The mean,standard deviation (SD) and coefficient of variation (CV) of various physico-chemical parameters of stormwaterwere computed and compared. Similarly correlation coefficients were worked out to find out the relationshipamongst physico-chemical characteristics of the water samples and a large number of significant correlationswere obtained.
