# Engineering Hydrology Questions and Answers – Flood Control – Set 5

This set of Engineering Hydrology Multiple Choice Questions & Answers (MCQs) focuses on “Flood Control – Set 5”.

1. How does flood insurance help in managing the harsh effects of flood?
a) Minimize impact of loss
b) Government funds
c) Policy for protection
d) Relocation and compensation

Explanation: Flood insurance provides a framework through which the loss due to flood can be distributed over a large number of individual, thus reducing the impact of loss burden on one person or family.

2. As per CWC, what is the flood situation when water level is between the warning and danger line?
a) Extreme
b) Severe
c) Above normal
d) Normal

Explanation: Above normal or moderate flood situation is when the water level touches or exceeds the warning line but remains below the danger line. A yellow signal is issued with notice in this flood situation.

3. Approximately how many number of CWC flood forecasting stations are present in India?
a) 175
b) 215
c) 250
d) 275

Explanation: The CWC has a National Flood Forecasting and Warning Network which comprises of 275 flood forecasting stations spread across nine major inter-state river systems and 24 states/union territories. This is as per the records of 2018.

4. As of 2012, which of the following states does not have a CWC flood forecasting station?
a) Gujarat
b) Maharashtra
c) Karnataka

Explanation: The 175 forecasting stations cover 17 states/union territories. These do not include states like Rajasthan, Arunachal Pradesh, Tamil Nadu, Kerala, etc. As of 2018, CWC flood forecasting stations have been setup in states like Tamil Nadu and Karnataka.

5. As of 2012, what is the approximate percentage of inflow type forecasting stations of CWC in India?
a) 10%
b) 20%
c) 30%
d) 40%

Explanation: The CWC has 175 flood forecasting stations out of which 147 are of river stage forecast and 28 are of inflow type forecast. So the percentage of inflow forecast station of the total is 16%. This is as per the data of 2012.

6. How many lines are there in a CWC level forecast station?
a) 2
b) 3
c) 4
d) 5

Explanation: The level forecast type stations in India have three lines or levels to identify the flood. These are the warning line, danger line and highest flood level from bottom to top. Depending on the flood level position with respect to these lines, the flood is suitably categorized.

7. As per the level forecast of CWC, what color signal is issued for a severe flood level?
a) Yellow
b) Orange
c) Red
d) Purple

Explanation: A severe flood is the case when the water level touches or exceeds the danger level but remains below the highest flood level. The CWC issues an orange bulletin with a special flood message in this case.

8. Long-range forecasts use satellite data to predict the flood events days in advance.
a) True
b) False

Explanation: Long-range forecasting uses radars and meteorological data form satellites with the aim of predicting the behavior of critical weather systems, the rain potential and occurrence time, without compromising on the reliability of the information.

9. Given below are the elevations of the lines in a level flood forecast station in North India.

Line Elevation from MSL (in m)
Warning line 101.55
Danger line 106.42
Highest flood line 108.67

A flood event occurred in which the water level was recorded to have an elevation of 108.75 m. What is the type of flood situation as per CWC?
a) Low flood
b) Moderate flood
c) Severe flood
d) Extreme flood

Explanation: The given flood event exceeds the existing highest flood level for the forecast station by (108.75 – 108.67) = 0.08 m or 8 cm. Hence, it is a situation of extreme flood with a red bulletin to be issued.

10. What is an unprecedented flood situation at forecasting station as per CWC?
a) Flood level crosses the HFL of the station
b) Flood level crosses danger line of station
c) Flood inflow exceeds all previous inflows
d) Flood level crosses previous HFL of all stations

Explanation: An unprecedented flood situation is the most extreme event in which the water level at a station crosses the highest flood level recorded at any level forecasting station across the country.

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