Discussion
The hydrographs which are obtained by directly measuring the runoff rates from watersheds are called as-
Answer: C
They are called Natural hydrographs.
A natural hydrograph is plotted directly from the observed discharge of a stream, by measuring runoff rates at the outlet of a watershed over time during and after a storm.
Unit, dimensionless and synthetic hydrographs are derived ones. A unit hydrograph is computed from natural hydrographs for 1 cm of excess rainfall, and a dimensionless hydrograph expresses discharge and time as ratios to their peak values. 'Basic hydrograph' is not a standard type.
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