Reservoir sustainability indexing/estimation is introduced in this paper. capable of handling sparse data. It innovates by interconnecting a set of three variables: estimating Environmental Water Requirements (EWRs) by conceptual rules; estimating Reliability. Resilience and Vulnerability (RRV) criteria by using EWRs; and thereby calculating Sustainability Indexes (SI). https://www.nacrack.com/mega-pick-As-for-Me-and-My-House-Wall-Decal-in-Hebrew-Yahauh-flash-find/