Discuss the concept of hydrograph. Explain the Unit Hydrograph with its applications and limitations.

A hydrograph is a graphical representation of the variation in discharge or flow rate of a river or stream over time at a specific location. It typically consists of time plotted on the x-axis and discharge (flow) on the y-axis. Hydrographs are essential in hydrology and water resources management as they provide insights into the response of a watershed to rainfall, helping in flood forecasting, water resource planning, and infrastructure design.

A hydrograph generally consists of three main components:

1. Rising Limb - The initial increase in discharge due to rainfall or snowmelt.

2. Crest Segment - The peak of the hydrograph representing the highest flow.

3. Recession Limb - The declining flow after the peak, indicating the depletion of stored water.

Factors affecting the shape and size of a hydrograph include rainfall intensity, duration, antecedent soil moisture, land use, vegetation cover, and watershed ____ _______ _______ _____ ____ ___ ____ _______ _________ _________ ____.
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