Precipitation is measured throughout the world at discrete points. Thus, to obtain volumetric values requires interpolation and integration over areas. This is termed as: Depth - Area - Duration. These relations are important to water resource designers and are still in use today as they can be applied to readily available data. The study area is Yazd - Ardekan plain. Data used for the estimation of Depth - Area - Duration were as follows: (l) Precipitation - monthly, daily and hourly (2) Topographic information (3) Weather maps and upper atmosphere data (4) Storm data. Depth - Area- Duration relationships were obtained through a statistical analysis of the largest record of precipitation in the region (30 years of daily rainfall at dense networks of rain gauges in Yazd province). Precipitation Depth - Area - Duration relationships were derived for 24, 48, 72 and 96 hours. The resulting average rainfall depth may then be used as input data to various models or formulas to make run - off calculations.
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