# GATE Questions & Answers of Infiltration

## What is the Weightage of Infiltration in GATE Exam?

Total 3 Questions have been asked from Infiltration topic of Hydrology subject in previous GATE papers. Average marks 1.33.

The infiltration rate $\style{font-family:'Times New Roman'}f$ in a basin under ponding condition is given by $\style{font-family:'Times New Roman'}{f=30+10\;e^{-2t}}$, where, $\style{font-family:'Times New Roman'}f$ is in mm/h and t is time in hour. Total depth of infiltration (in mm, up to one decimal place) during the last 20 minutes of a storm of 30 minutes duration is ______

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During a storm event in a certain period, the rainfull intensity is 3.5 cm/hour and the $\style{font-family:'Times New Roman'}{\mathrm\Phi}$ -index is 1.5 cm/hour. The intensity of effective rainfall (in cm/hour, up to one decimal place)  for this period is _____________

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The infiltration capacity of a soil follows the Horton's exponetial model, $\style{font-family:'Times New Roman'}{f=c_1+c_2e^{-kt}}$. During an experiment the inital infiltration capacity was observed to be 200 mm/h. After a long time the infiltration capacity was reduced to 25 mm/h. If the infiltration capacity after 1 hour was 90 mm/h. the value of the decay rate constant, k (in h-1 up to two decimal places) is ____________.