The fencing will go up along flood control channels in Garden Grove, Santa Ana and Westminster.
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In some cases, existing fences that have been cut away will be reinforced.
The fencing plan follows this summer's arson fires in the Santiago Creek area of Santa Ana.
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One fire caused $20,000 in damage.
MORE: Police arrest arson suspect accused of starting 14 fires in Orange County
OC police arrest arson suspect accused of starting 14 fires