Marin Water has given the public an additional two months to weigh in on its controversial plan to raise the Nicasio Reservoir spillway, a move some fear would flood several residences along with the school grounds. The project is one of several being considered to increase the district’s storage capacity to cope with future drought. Members of the Nicasio Land Owners Association believe Marin Water is underestimating the potential impacts. The district will now take…