1.We built a weir weir is not permanent, natural materials, primarily for slow water in the dry season, but was not built to retain water. The flow of water at the upstream face, there is water. All the time, whether it permeate through the FAI.2. The height of the dam, not very high altitude, about 40% of the height of the highest water level in the creek or stream. The water can overflow through the weir. All the time, to keep the ecosystem, upstream face.
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