4. Solve Problem 6.25 in the text, or see below. (Equation 4-3 referred to in the problem is the specific energy equation.) 25. Water is flowing in a 5.0-foot-wide rectangular channel

with a quantity of 100 cfs. Plot a graph of D, versus E by choosing a variety of flow depths D, and for each flow depth computing the corresponding value of E using Equation 4-3. Use the graph you plotted to determine critical depth in the channel.