Double Mass Curve and DAD Analysis

Q. Depth-Area-Duration curves of precipitation are drawn as

1. minimizing envelopes through the appropriate data points
2. maximizing envelopes through the appropriate data points
3. best fit mean curves through the appropriate data points
4. best fit mean straight lines through the appropriate data points

Q. Depth-Area-Duration curves would seem to resemble

1. arcs of circle concave upwards with duration increasing outward
2. first quadrant limbs of hyperbolae with duration increasing outward
3. third quadrant limbs of hyperbolae with duration decreasing outward
4. first quadrant limbs of hyperbolae with duration decreasing outward

Q. Steep rise in the flow-mass curve during a certain period indicates:

1. Very high evaporation losses during that period
2. Flash floods during that period
3. Sudden spurt in irrigation demand during that period
4. Sudden rise in demand for water to meet hydropower generation

Q. Consider the following with respect to 'double-mass curve'
1. Plot of accumulated rainfall with respect to two chronological orders
2. Plot for estimating multiple missing rainfall data
3. Plot for checking the consistency of the rainfall data
4. Plot of accumulated annual rainfall of a station vs. accumulated rainfall of a group of stations

Which of these statements are correct?

1. 1 and 3
2. 2 and 3
3. 3 and 4
4. 1 and 4

Q. Inconsistency of rainfall data can be checked by which one of the following?

1. Normal ratio method
2. Mass curve method
3. Double-mass curve method
4. Depth duration frequency curve

Q. The double mass curve technique is adopted

1. To find the number of raingauge required
2. To check the consistency of raingauge records
3. To estimate the missing rainfall data
4. To find the average rainfall over a number of years

Q. A Double-Mass-Curve Analysis is useful in

1. Consistency analysis
2. Frequency Analysis
3. Storage Computation Analysis
4. Guessing missing data in cases of non-homogeneous terrain

Q. The double mass analysis is adopted to

1. Estimate the missing rainfall data
2. Obtain intensities of rainfall at various durations
3. Check the consistency of data
4. Obtain the amount of storage needed to maintain a demand pattern

Q. For which one of the following purposes is the double mass curve used?

1. Checking on the consistency of precipitation records.
2. Prediction of annual precipitation
3. Defining which periods of storm should be analyzed to obtain the maximum useul information from storm rainfall records.
4. For estimating the capacity of a reservoir.

Q.

The Enhanced Fujita scale rates the intensity of tornadoes based on wind speed and damage caused. An EF5 tornado is estimated to have wind speeds greater than $200$ miles per hour. Write and graph an inequality that represents this situation.

Q. The areal characteristics of a rain storm are represented by a-

1. DAD curve
2. Hyetograph
3. Mass curve
4. Double mass curve

Q. Double mass curves are used

1. to check on the consistency of precipitation records
2. as basis for storm rainfall analysis
3. to determine average rainfall over an area
4. to indicate rainfall distribution