Irrigation Engineering
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

140 mm
90 mm
50 mm
60 mm

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Irrigation Engineering
As per Lacey’s theory, the silt factor is

directly proportional to square root of average particle size
directly proportional to average par¬ticle size
inversely proportional to average par¬ticle size
not related to average particle size

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