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Hydrology Test 1
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  • Question 1/9
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    A catchment has an area of 100 hectares (1 hectare = 10000 m2) and runoff coefficient of 0.4. Due to a 5 cm rainfall event over the catchment, the stream flow at the outlet lasts for 10 h. What is the value off average streamflow (in m3/hour) at the outlet of the catchment for this event?
  • Question 2/9
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    The ratio of actual evapo-transpiration to potential evapo-transpiration is in the range:
  • Question 3/9
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    In the case of large rivers, a number of equidistant vertical sections of the total width of flow are identified, for the purpose of finding by numerical integration, the total discharge on any day. On each section, the mean velocity is taken as the arithmetic average of two typical depths on that section. Then the mean velocity is worked out for that section. Usually, the mean velocity of any section, corresponds to which one of the following? (V represents the point velocity at the given section and the depth such as 0.1d, 0.2d.... etc.)
  • Question 4/9
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    According to IS 4987: 1994, in a region with an average elevation of one kilometre from sea level, the network density shall be one rain gauge 

  • Question 5/9
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    A catchment area has 4 rain gauges installed, with an annual average rainfall of 110 cm and a standard deviation of 25 cm. If an error of 0.10 is allowed in the estimation of mean rainfall data, the additional number of rain gauges required are
  • Question 6/9
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    A hydraulic structure is to be designed for a 40 year returns period. The design team allows a maximum risk of failure of 30%. The maximum design life of the structure is
  • Question 7/9
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    Rain fall intensities in mm/hr at half an hour interval during a 4-hour storm were: 5, 9, 20, 13, 6, 8, 16 and 3 mm/hr. If the corresponding observed runoff is 27.45 million m3 from a basin having an area of 1830 Km2? The ϕ-index for storm is 
  • Question 8/9
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    The velocity of the streamflow when measured using a current meter at a point A is found to be 5 m/s when the current meter rotates at 50 rev/s and the velocity at another point B measured using same current meter is found to be 3 m/s when the current meter rotates at 40 rev/s. The velocity of the stream at a section 50 m downstream of point B where the same current meter rotates at 60 rev/sec is – (in m/s up to 2 decimal places)
  • Question 9/9
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    A lake had a water surface elevation of 100.00 m above datum at the beginning of a certain month. The average inflow for the lakes from the surface runoff is 5 m3/s whereas 6 m3/s of the water was utilized by the municipal body to deliver to public during the same tenure. Cumulative rainfall and evaporation for the month was measured as 150 mm and 50 mm respectively. Calculate the fluctuation of the lake level comparing at the start and end of the month (in mm up to two decimal places), if the cross-sectional area of the lake is 5000 hectares.
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