Discussion
The shape of falling limb of a hydrograph is dependent on ______.
Answer: C
The falling limb depends on basin characteristics only.
The falling (recession) limb of a hydrograph begins after the peak, once rainfall has stopped adding to the flow. From then on the discharge is the catchment draining its stored water, from surface, channel and groundwater storage, and its shape is set by the properties of the basin: its size, shape, slope, drainage density, soils and geology. This is why a recession curve can be described by a basin constant and is independent of the storm that produced it.
The rising limb and the peak are the parts that depend on both basin and storm characteristics, such as rainfall intensity, duration and its movement across the basin. Storm characteristics alone, or the direction of the rainfall, do not govern the recession.
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