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the eastern portion of the watershed, which accounts for about 70 percent of the watershed’s overall flows that could yield peak flows up to 100 times higher than pre-fire conditions. Left untreated, fans will become impaired and degrade significantly, creating massive head cuts and clogging downstream drainages with sediment. Although no project can completely eliminate sediment, these measures will help to arrest erosion (known as head cutting) and thus the alluvial fan can continue to spread out floodwater, causing some sediment to drop out instead of allowing it to travel downstream and fill up off-forest drainage structures and impact private properties.
This $200,000 project, which is funded in part by a U.S. Forest Service (USFS) Regional Advisory Committee (RAC) grant of approximately $158,000, was originally scheduled for completion by the end of June. Early completion is primarily due to the extensive experience of the project’s design and construction teams, as well as that of the Flood Control District’s engineering, inspection and construction management teams, which was derived from designing and installing long-term flood mitigation measures in the Schultz Flood area.