The maximum average depth due to one day storm over an area of 100 km2 is 100 mm. Depth-Area-Duration (DAD) curves indicate that for the same area of 100 km the maximum average depth for a 3 hour storm will be A. 100 mm B. More than 100 mm C. Less than 100 mm D. None of the above

The correct answer is: C. Less than 100 mm

A DAD curve is a graphical representation of the relationship between depth, area, and duration of rainfall. It is used to estimate the maximum average depth of rainfall for a given area and duration.

The maximum average depth of rainfall for a one-day storm over an area of 100 km2 is 100 mm. This means that if a storm lasted for one day and covered an area of 100 km2, the average depth of rainfall would be 100 mm.

However, a 3-hour storm is shorter than a one-day storm. This means that the maximum average depth of rainfall for a 3-hour storm will be less than the maximum average depth of rainfall for a one-day storm.

In addition, a 3-hour storm is more intense than a one-day storm. This means that the rainfall will be more concentrated in a shorter period of time, which will also result in a lower average depth of rainfall.

Therefore, the maximum average depth of rainfall for a 3-hour storm over an area of 100 km2 will be less than 100 mm.