The Nicasio Land Owners Association has a simple message for Marin Water as the agency prepares to raise the level of the Nicasio Reservoir: slow down.

Elevating the reservoir’s spillway is one of several projects the district is planning to increase its storage capacity to cope with droughts. But association members fear raising the level could exacerbate flooding along the banks of Halleck and Nicasio Creeks, which they say occurs routinely during the rainy season.