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However, ARI is frequently calculated as the inverse of AEP for the annual maximum series in this case it represents the average period between years in which a given precipitation magnitude is exceeded at least once.ĬASCADE, RESIDUAL ADD-BACK (CRAB) - The HDSC-developed spatial interpolation procedure for deriving grids of precipitation frequency estimates from grids of mean annual maxima and point precipitation frequency estimates for a given duration.ĬONSTRAINED OBSERVATION - A precipitation measurement or observation bound by clock hours and occurring in regular intervals.
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RETURN PERIOD, AVERAGE RETURN PERIOD) - Average time between cases of a particular precipitation magnitude for a specified duration and at a given location the term is associated with the analysis of partial duration series. The first element of the grid corresponds to the upper-left corner of the grid.ĪVERAGE RECURRENCE INTERVAL (ARI a.k.a.
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The grid is written as a series of rows, which contain one ASCII integer or floating point value per column in the grid. ANNUAL EXCEEDANCE PROBABILITY (AEP) - The probability associated with exceeding a given amount in any given year once or more than once the inverse of AEP provides a measure of the average time between years (and not events) in which a particular value is exceeded at least once the term is associated with analysis of annual maximum series (see also AVERAGE RECCURENCE INTERVAL).ĪNNUAL MAXIMUM SERIES (AMS) - Time series of the largest precipitation amounts in a continuous 12-month period (calendar or water year) for a specified duration at a given station.ĪSCII GRID - Grid format with a 6-line header, which provides location and size of the grid and precedes the actual grid data.