PE Exam Practice Problem #42: Water Resources | Open Channel Flow - Mannings Equation

Welcome to SolvedIn6: Free practice problems for the Professional Engineering Exam! Each question is styled after those created by the NCEES, and is usually solved in under 6 minutes, which is the average time you will have to solve each question on the Professional Engineering Exam.
The problem we are working on today is on the subject of open channel flow. All we have to do is perform the following steps:
Step 1: Find the total volume of water behind the dam
Step 2: Use Mannings Equation to find the flow rate of water in the channel.
Step 3: Divide the water volume by the flow rate to get the time it will take to empty the dam.
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