Which of the following is not correct in connection with canal lining?
Question 2Multiple Correct Options
The concentration of Na, Ca and Mg are 21, 3 and 1.5 meq respectively and the electrical conductivity is 200 micro mho/cm at 25◦C .
Which one of the following statements is true?
i. Correction due to earth’s curvature is always negative
ii. Correction due to refraction is always negative
iii. Combined correction due to curvature and refraction is always negative
A closed traverse has the following lengths and bearings:
The length CD and bearing AB couldn’t be measured due to some obstruction to chaining and local attraction. What are the exact length of CD and bearing of AB?
Which of the following statement is not correct?
Flow depth and bed slope of a wide rectangular alluvial canal are 3.8 m and 1.5 × 10–4 respectively. The velocity is found out to be 1.9 m/s. The mean size of the sediment particles is 1.6 mm. What is the ratio of rugosity coefficient given by Strickler’s formula to the actual rugosity coefficient?
A flow of 150 l/s was supplied for 8 hours from a tank to irrigate 2 ha of land. It was found that the actual delivery rate at the farm was less than 150 l/s. If the conveyance loss was 864 m3and percolation and runoff in the field were 240 and 760 m3 respectively, then the water application efficiency of this system is __________%.
What is the actual area covered (in km2) by a 20 cm × 20 cm size vertical aerial photograph, if the longitudinal overlap and side overlap are 60% and 40% respectively the scale of the photography is 1 : 20000.