Lecture 17

Lecture 17 - FLASH FLOODS If you're in a dry gully and you...

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http://www.geo-outdoors.info/flash_floods.htm FLASH FLOODS If you're in a dry gully and ou start to see a trickle of you start to see a trickle of water like in this photo, MOVE QUICKLY for high ground. Even if it's a clear, ater sunny day, this trickle of water means it rained HARD somewhere up tream and e gully is Water esources stream and the gully is about to flood . The consequences can be deadly. Resources ngineering Engineering - Lecture 17 1 Prepared by T. Wagener & P. Reed Penn State University
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Hydrologic Processes 2
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Unit Hydrograph The transfer function that describes the 3 characteristic response of a given watershed to a unit volume of excess rainfall.
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ontent Content ydrologic losses and rainfall excess 1. Hydrologic losses and rainfall excess (review) ainfall noff analysis using unit 2. Rainfall-runoff analysis using unit hydrograph approach 3. Synthetic unit hydrograph 4. S-Hydrographs 4
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ecap: aseflow uickflow Recap Baseflow & Quickflow Quickflow 5 Baseflow
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ecap: aseflow uickflow Recap Baseflow & Quickflow Figure 8.1.3b (p. 249) Sources of streamflow on a hillslope profile during a dry period rom Mosley and McKerchan (1993)) 6 ( b ) Sources of streamflow on a hillslope profile during a dry period (from Mosley and McKerchan (1993)). Figure 8.1.3c (p. 249) ( c ) Sources of streamflow on a hillslope profile during a rainfall event (from Mosley and McKerchan (1993)).
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Hydrologic Losses & Rainfall Excess 7
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ainfall Excess Rainfall Excess Rainfall excess, or effective rainfall , is that rainfall that is either retained on the land surface nor infiltrated into neither retained on the land surface nor infiltrated into the soil. Rainfall excess is the volume of water from rainfall that is vailable r overland flow available for overland flow.
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Lecture 17 - FLASH FLOODS If you're in a dry gully and you...

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