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My employee is constructing a cover for my garden. There is not a peak in the middle. The water will drain to one side of the garden. On one side, the tubos set in concrete are 7 feet high. On the opposite side he set tubos 6 feet high. The space between the two sides is 12 feet. There will be carriolas welded every four feet from one side to the other for the 30-foot length of the garden to support a plastic cover. He just welded the first carriola today from the 7-foot side across to the 6-foot side. I called a halt to the procedure because it sure looks to me that a one-foot difference between 12 feet will not provide sufficient drainage of the rain. He may have to remove that first carriola and cut the 6-foot tubos to a shorter length. Can someone please give me the correct advice about how much shorter the one side should be in order to provide proper drainage of the rain? I looked on the internet and all the information about "ratios," etc. is beyond my comprehension. Thanks!