Climate Central: In states like Missouri, last summer's drought was downright scary. Farmers saw their corn shrivel in the fields, ranchers ran out of feed for their cattle, and commerce on the Mississippi River slowed to a crawl, as barges struggled to avoid newly exposed rocks on the low-flowing river. But this spring brought relief. And now, after one of the wettest springs on record, life will return to a different sort of normal for many Midwestern farmers, as they deal with the problem of having too much water....