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The community participation is a crucial factor in getting these kinds of projects to come together, as well as the financing from many sources that require significant cooperation and teamwork. It requires not only design and engineering, but also an ability to implement the construction of these kinds of wetlands and water swales so that they work with the local ecology and the Los Angeles River itself, not to mention the myriad City and County regulations that must be satisfied in these situations. In a watershed, many important public policy and water regulation structures must be dealt with. This can be a very long process that is difficult to fund.