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2015-2016 Maintenance & Storm Preparedness Zone 10: Inverness
Date
Watershed Reference

Winter Weather Outlook

The National Weather Service's Climate Prediction Center anticipates that there will be a strong El Niño this upcoming winter and their latest precipitation outlook for December through March indicates that Marin is likely to receive higher than average amounts of precipitation. Additionally, due in part to warmer than average ocean waters, tides could be significantly higher than predicted.

Maintenance Overview

Regardless of predictions, the Marin County Flood Control & Water Conservation District (District) prepares for every year as though it is an “El Niño year.” Although two major flooding years in Marin's history occurred during years with El Niño episodes (1997/98 and 1982/83), it is not unusual to experience major flooding in the absence of El Niño, such as in 2005/06. Flooding can even occur during a drought year such as last year, when the County suffered some of its worst flooding damage since 2006.

It is for these reasons that the District follows a consistent system of facility and creek maintenance each year which mitigates the risk of flooding. We conduct regular inspections of the creeks, floodwalls, and levees within our jurisdiction, and frequently test our pumps, motors, and generators. Creeks, drainage ditches, pipes, trash racks, and pump wet wells are cleared of vegetation, sediment, and trash in the fall and throughout the winter as needed. A flood control zone-specific update regarding maintenance, storm preparedness and response in your local area is provided below.

Pump Station Maintenance

There are no District operated pump stations in Flood Control Zone 10 - Inverness.

Vegetation Maintenance

Conservation Corps North Bay performs vegetation maintenance work in creeks in the flood zone as requested by the Advisory Board to Zone 10, and as permitted by property owners.

Sediment Removal

Sediment removal is performed by the County's Road Maintenance crew in areas where they have right-of-way. Crossings under Sir Francis Drake at First, Second, and Third Valley Creeks, Dream Farm Creek, Fish Hatchery Creek, Hagerty Gulch, and Redwood Canyon Creek are cleaned every 5 years. Various parts of Old Bear Valley Creek near Sir Francis Drake are cleaned every 1-5 years.

Levee/Floodwall Maintenance & Rodent Control

There are no District-owned levees or floodwalls in Zone 10.

Precipitation and Stream Gauge Maintenance

The District owns several precipitation and stream gauges throughout the County which help inform us of water levels in creeks and heavy rainfall in real-time. The nearest rain gauges are at Point Reyes Station and Oceana Marin. For more information on the gauges visit https://marin.onerain.com/home.php. Preventative maintenance on the gauges is performed twice annually - September/October and February/March - and as needed. A grant has recently been awarded to upgrade the gauge software and is expected to be underway after this rainy season.

Storm Response

Before, during, and after storms, the Conservation Corps North Bay inspects and clears facilities as needed. They are also available for sandbagging and/or tarping levees and creek banks if requested. The District has a fleet of portable pumps which are maintained and tested prior to the winter season and some are pre- deployed in key locations.

The District is evaluating and has received a bid for temporary removable flood barriers which could be deployed quickly and in lieu of sandbags at flood threatened locations. The barriers are made of high strength plastic and achieve their stability by filling them with water.