Dear Rubina, I prefer to look ...

Dear Rubina, I prefer to look at this issue from a slightly different perspective, one that is more holistic for metering water usually means it needs to be rationed. In order to properly answer your question one needs requirements - as some of the esteemed commentators have stated before. With this information you can look at the many solutions available for metering water. I on the other hand prefer to work with an open solution that can accommodate any meter and can be integrated with weather monitoring, power usage and communication so that large areas can benefit from its deployment - the result is also reduced cost per farmer, better metrics and added benefits such as alerts to wastage. Those keen can also incorporate said systems with GIS etc to enable additional protection to the farmer and environment - we currently are doing this for growth patterns and warning of invasive species while adding layers showing attempts to correct or improve situations. The same system can incorporate green energy systems and real time reporting to help optimize the use of this valuable resource. We also use sophisticated systems to dramatically reduce the amount of water needed to grow intense amounts and are planning for an experimental location that would target rice production. Simple metering systems can also be used that are basically free but they lack accuracy. The other area for opportunity is recycling of water and the reduction of fertilizer though processes that reduce water use and build soil. All the best.