During heavy storms like the area had in January and March, the sediment and brush impediments have a damming effect. Water will flow along the path of least resistance, and when the channel is clo…
SALINAS – With the economic impact from the January and March flooding estimated at $1 billion, many growers are left feeling frustrated because they say much of the damage to their croplands could have been prevented.
Growers understand the dynamics of flow capacity so they historically have gone into the channel in the summer and cut back brush – including an invasive species called Arundo – and cleared the built-up sand and other sediments. In doing so the flow capacity is increased and the river is more likely to stay between its banks.
The stream maintenance program that Bates oversees allows growers to get into these secondary channels and remove brush and sediment. The idea is that when the main channel reaches certain flood stages the water conveys into the secondary channels that have been cleared for greater flow capacity. This diversion of river flow allows the main channel to stay within its banks and off cropland.
Norm Groot, the executive director of the Monterey County Farm Bureau, said the diminished capacity flow is key to flooding, and to open up any of that flow capacity is a lengthy and expensive process. Public agencies have also noted the damage caused in areas of the river that are overgrown with Arundo. Arundo can grow tall and thick and have impacts on the entire river ecosystem. Worse, it’s not a native plant.
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