CEIE 340 Lecture 4 Precipitation

CEIE 340 Lecture 4 Precipitation - Precipitation Water...

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1 Water Resource Engineering CEIE 340 Sayedul H. Choudhury, Ph.D. Precipitation Today’s Topics s Rainfall Characteristics s Estimating Missing Rainfall Data s Average Areal Rainfall s Development of a Design Storm s Probable Maximum Precipitation
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2 Hydrologic Cycle Precipitation s May take many forms, including rain, snow, sleet, hail, and mist s Only rain and snow are important in hydrologic design s Hydrologic design requires a knowledge of when and where rainfall occurs at extreme intensities and volumes. s Important characteristics of rainfall include intensity (rate), duration, time interval, and spatial variation.
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3 Hyetograph s A graph of the rainfall intensity or volume as a function of time Types of Storms s Actual Storm : Based on historic data at a specific location s Design Storm : Based on synthetic data (a hyetograph with preselected characteristics) s Most hydrologic designs use the design- storm approach s Generally, the regulations and the type application dictate where an actual storm or a design storm should be used
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4 Rainfall Characteristics s Volume : The amount of rainfall during an entire storm s Duration : The length of time over which a storm occurs s Frequency : The frequency of occurrence of storms that have the same volume and duration s Intensity : The volume of rainfall per unit time interval (i.e. rate of rainfall) s (inverse of the time interval) Volume/Depth s The amount of rainfall during an entire storm. s Volume is often expressed as depth – uniform depth over the watershed
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5 Frequency s The frequency of occurrence of storms that have the same volume and duration s Expressed as exceedence probability or
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CEIE 340 Lecture 4 Precipitation - Precipitation Water...

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