In preparation for future droughts, Marin Water has begun implementing a plan to raise water levels in the Nicasio Reservoir by modifying its spillway. The project is one of many being contemplated as the district implements its water supply roadmap, a document approved last year that outlines ambitious plans for increasing supply. In the aftermath of the 2020-2021 drought, Marin Water began contemplating a variety of short- and long-term measures for increasing storage. Modifying the…