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B
Obtained after deducting from rainfall water what has infiltrated and/or evaporated, from the total rainfall.
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C
excluding the base flow in surface channels after the rainfall.
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D
flown (or flowing) through all channels over a specified period of time.
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Solution
The correct option is B Obtained after deducting from rainfall water what has infiltrated and/or evaporated, from the total rainfall. According to water balance,
Runoff + Evapotranspiration + Infiltration/ Recharge = Precipitation