The falling of moisture from the atmosphere to the earth's surface in any form (such as rain, snow, or hail) is called:

The ratio of rainfall in a particular year to the Average Annual Rainfall (AAR) is defined as the:

A unit hydrograph represents a direct runoff hydrograph resulting from one unit depth of:

The peak of the outflow hydrograph will occur at the point of intersection of the inflow and outflow curves in which of the following cases?