Question

Depth-Area-Duration curves of precipitation are drawn as

• A. minimizing envelopes through the appropriate data points
• B. maximizing envelopes through the appropriate data points
• C. best fit mean curves through the appropriate data points
• D. best fit mean straight lines through the appropriate data points

Answer 1

The correct option is B maximizing envelopes through the appropriate data points

The maximum depth area curve for a given duration D is prepared by assuming the area distribution of rainfall for smaller duration to be similar to the total storm. The procedure is then repeated for different storms and the envelope curve of maximum depth area for duration D is obtained. A similar procedure for various values of D results in a family of envelope curves of maximum depth vs area, with duration as the third parameter. These curves are called DAD curves.