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Most of reservoirs have serious siltation problem, as a result less than half storage of the original design is available. Modification to the reservoir sludge as a starting point to create environmentally products, using of modified sludge developed a revolutionary, environmentally friendly material: bi-birth sludge leather. Sludge leather is highly breathable and waterproof and can replace traditional leather. bi-birth sludge leather is an innovative environmental product for today's environment, rising awareness of animal protection and leather and fur utilization in a considerable degree.