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Rainwater harvesting research is being conducted in much wider perspectives from agriculture to using in house toilets. The study has assessed the research activity by different countries with the help of Activity Index (AI) and the collaboration and its impact. The SCOPUS publication records are made use of for the analysis of RWH research activities. The quality of the publications is analysed in terms of citations received to the papers and Spain has come on the top having 42 citations per paper. Cross-field relative activity in rainwater harvesting research is measured and it was interesting to note that among the leading countries conducting RWH research, a few developed countries are below world average of RWH activity. Out of the 141 countries which have at least one publication on RWH, 132 (94%) have at least one paper written in collaboration with other countries. US is the collaboration hub of many countries and the strength of collaboration of India, China, UK, Brazil is noteworthy. It was also found that there is a positive correlation between the collaboration strength and impact of papers. The results are relevant to know the relative of strength of different countries in RWH as well as boosting the collaboration among countries and researcher mobility.