The County can only remove trees from creeks that they maintain. Usually these are improved (concrete lined or earth trapezoidal) channels. Some creeks are maintained only for capacity, not erosion or other damage.
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The Flood Control District has over 2,000 data points where the flow rates have been calculated. Most of these are the “design” flow rates based on General Plan build out2. Depending on the watershed size, the flow rate could be for the 10-year, 25-year, 50-year or 100-year flood. For information on the flow rates that the Flood Control District has for these data points call the County Public Works Department, Flood Control Division at (925) 313-2000 or email your request.
Call the Contra Costa Clean Water Program hotline at 1(800)No-Dumping or report online.
Grass clippings or other yard waste smothers natural vegetation and can add excessive nutrients to the creek. When the yard waste decays it introduces high nutrient levels, which reduces oxygen levels in the water, harming aquatic life in the creek. The material can also float downstream, lodge against trees, and become a major obstruction to stormwater flows. Current State regulations prohibit the discharge, dumping or release of potential pollutants into watercourses. This includes grass clippings and yard waste.
County ordinances require that proposed work in creeks in unincorporated areas be reviews and allowed only by a County Drainage Permit. The Contra Costa County Flood Control and Water Conservation District (FC District) boundaries cover all of Contra Costa County. Within FC District right of ways (where FC District faculties were built and are maintained) a FC District Encroachment Permit is required. Within it's right of way FC District can dictate construction standards and methods, hydraulic and hydrology calculation methods, and other standards such as freeboard standards. The County has adopted the FC District standards and so in the unincorporated areas the FC District standards are used. FEMA will require you to use the FCD flow rates in any FEMA study. Other State and Federal entities have authority to control work with in creeks and riparian areas. When you apply for a Drainage Permit or FC District Encroachment Permit, we ensure that the permits are obtained from those entities as well.
If you have more questions call (925) 313-2000 and ask for Flood Control staff or email us.