To give you a taste, here are two classic problem types whose solutions are detailed in the manual:
If you cannot find the official solution manual, do not despair. There are excellent alternatives:
In fluid mechanics, it is very easy to make a sign error (e.g., forgetting to convert pressure head or mismatching units of meters to kilopascals). The solution manual provides a cross-check. Students need to see where they dropped a negative sign or misapplied the continuity equation.