Unlike the projects for structures, the percentage displayed for the stream project represents the amount of blockage. When the stream is completely blocked, the obstruction is 100%. As the villagers clear the obstruction, the percentage decreases until the stream is completely cleared, and the percentage of blockage is zero. Debris will continue to accumulate, however, so if the stream is not kept clear by the villagers, the percentage of obstruction will gradually increase until the stream is once again blocked.
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