The Marin Municipal Water District’s water supply projects can’t be phased as the staff had hoped. Staff presented an update on its pipeline projects to the operations committee at its meeting on Friday. The update included construction cost estimates on three water conveyance options, and news on how they could be built. … The utility is exploring whether to connect pipelines in Petaluma and Cotati to its reservoirs in order to fortify its supply. The pipelines would transport treated Russian River water into Marin reservoirs through a 9-mile aqueduct along the Highway 101 corridor from Petaluma to the North Marin Water District in Novato. The district would send the water to the Marin Municipal Water District’s distribution system.