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You could consider connecting multiple tanks to a wet well sump located below the level of your tanks. This would allow a single pump, the wet well being supplied by gravity, connected to your intended distribution system. This would allow either a submersible or surface mounted pump to be used. It is difficult to comment on the cost effectiveness of these options without knowing what kind of piping network would be required to connect, but a single pumping station would probably cheaper and certainly less complicated to run and maintain. It would also be fairly simple matter to provide extra storage to the network after it had been established. I would suggest you check out the IUCN website on rainwater harvesting, you will be able to have a look at appropriate guttering and associated collection efficiencies. Commercial pump suppliers, such as Davis and Shirliff (Offices in Tanzania https://www.dayliff.com/) websites will generally have performance data on their pumps for download. Regards Cody