A hydrograph representing one cm of run off from a rainfall of some unit duration and specific area distribution is known as

Related MCQs

• Instantaneous unit hydrograph is a hydrograph of i) unit duration ii) unit rainfall excess iii) infinitely small duration iv) infinitely small rainfall excess The correct answer is
• The peak of a 4 hour flood hydrograph is 240 m3/sec . If the rainfall excess is 80 mm and base flow which is constant is 40 m3/sec, then the peak of 4-hours unit hydrograph will be
• The unit hydrograph of a specified duration can be used to evaluate the hydrograph of storms of
• The graphical representation of average rainfall and rainfall excess (i.e. rainfall minus infiltration) rates over specified areas during successive unit time intervals during a storm is known as
• The unit hydrograph due to a storm may be obtained by dividing the ordinates of the direct runoff hydrograph by
• S-hydrograph is used to obtain unit hydrograph of
• The best unit duration of storm for a unit hydrograph is
• Variability of rainfall is i) largest in regions of high rainfall ii) largest in coastal areas iii) largest in regions of scanty rainfall The correct answer is
• Assertion A : To estimate the rainfall over a catchment, the number of raingauges required per unit area is large for hilly areas. Reason R : Rainfall gradient is steep. Select your correct answer according to the coding system given below :
• The rainfall on five successive days were measured as 100 mm, 80 mm, 60 mm, 40 mm and 20 mm respectively. If the infiltration index or the storm loss rate for the catchment area is earlier estimated as 50 mm/day, the total surface run off will be