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Message: <blockquote data-quote="Umbran" data-source="post: 1292279" data-attributes="member: 177">The geology isn't the big issue.  A druid has pretty good mastery over elements - Soften Earth, Stone Shape, Lower Water, Transmute Rock to Mud, Wall of Stone, Move Earth, Earthquake, and the various Summon Nature's Ally spells should give the druid reasonable ability to control the situation and/or close the tunnel.Especially when you figure that it takes a while to fill an entire prairie.  Say the tunnel is a standard 10' square job.  Assuming I've done my math right, if the water moves through the tunnel at about 22 miles per hour (which is quick for water - faster than most of us can run on the flat), then it'll take an entire day to make a modest lake ten feet deep and one mile square.  How many square miles is an entire prairie?  How long before the druid notices what's up and stops it using the above spells?</blockquote>