This document discusses how gendered local irrigation institutions in Nepal shape access to water, particularly during times of scarcity. It analyzes two farmer managed irrigation systems (AFMIS and GFMIS) and finds that AFMIS, which lacks a formal water users' committee and allocation rules, leads to inequitable access for women and lower castes who must divert water at night. In contrast, GFMIS, which has an inclusive water users' committee and fixed rotation schedule, improves access for all farmers, including women from marginalized groups. The study concludes that formal, inclusive irrigation institutions are important for decreasing the vulnerability of marginalized populations during water shortages.