jay ann's report

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The double-mass curve (Hindall 1991), a

cumulative plot of one hydrologic variable versus

another over time (Fig. 3-3), is another easy

graphical technique for examining trends in a time

series. Although the double mass curve in Fig. 3-3

shows a plot of precipitation versus streamflow,

one could also plot a hydrologic time series known

to be stationary versus the time series for another

river. If the time series for the second river is

stationary, the double mass plot will appear as a

straight line. In the case of the trend illustrated in

Fig. 3-3, the slope should be relatively constant

over all of the years if the flow trend was related to

precipitation.

The break in slope in Fig. 3-3 indicates a change in

water yield from the watershed, because the

amount of runoff from each precipitation event

increased during that time period. (The change in

runoff resulted from the 1968 failure of two small

flood control reservoirs in the headwaters.)Back to previous slide


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continuation to the Adjustment of Streamflow Data topic


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continuation to Mean Annual Runoff


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Define: Conduit a natural or artificial channel through which

something (as a fluid) is conveyed

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Define: Runoff GEOGRAPHYwater not absorbed by soil: rainfall that

does not soak into the soil but flows into surface

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Define: reservoirAreservoir , artificial

lake or impoundment from a dam is used tostorewater. Reservoirs may be created in river

valleys by the construction of a dam or may bebuilt by excavation in the ground or byconventional construction techniques such asbrickwork or cast concrete.

The term reservoir may also be used to describenaturally occurring underground reservoirs suchas those beneath an oil orwater well.

PreviousSlide
http://en.wikipedia.org/wiki/Damhttp://en.wikipedia.org/wiki/Waterhttp://en.wikipedia.org/wiki/Damhttp://en.wikipedia.org/wiki/Oil_wellhttp://en.wikipedia.org/wiki/Water_wellhttp://en.wikipedia.org/wiki/Water_wellhttp://en.wikipedia.org/wiki/Oil_wellhttp://en.wikipedia.org/wiki/Damhttp://en.wikipedia.org/wiki/Waterhttp://en.wikipedia.org/wiki/Dam


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Define: Diversion

change of direction: a change in the direction orpath of

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Define: Levee Alevee, dike (or dyke), embankment, floodbank

or stopbankis an elongated naturally occurring ridge orartificially constructed fill or wall, which regulates waterlevels. It is usuallyearthen and often parallel to the

course of a river in its floodplain or along low-lyingcoastlines.

natural embankment beside river: a naturalembankment alongside a river, formed by sedimentduring times of flooding

artificial embankment beside river: an artificialembankment alongside a river, built to prevent floodingof the surrounding

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http://en.wikipedia.org/wiki/Fill_dirthttp://en.wikipedia.org/wiki/Soilhttp://en.wikipedia.org/wiki/Parallel_(geometry)http://en.wikipedia.org/wiki/Riverhttp://en.wikipedia.org/wiki/Floodplainhttp://en.wikipedia.org/wiki/Floodplainhttp://en.wikipedia.org/wiki/Riverhttp://en.wikipedia.org/wiki/Parallel_(geometry)http://en.wikipedia.org/wiki/Soilhttp://en.wikipedia.org/wiki/Fill_dirthttp://localhost/var/www/apps/conversion/current/tmp/scratch8226/Stream%20flow%20final.avi


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These data are continuous records of discharge, frequently

measured in permanent structures such as flumes and weirs.

BACK
http://localhost/var/www/apps/conversion/current/tmp/scratch8226/Stream%20flow%20final.avihttp://localhost/var/www/apps/conversion/current/tmp/scratch8226/Stream%20flow%20final.avihttp://localhost/var/www/apps/conversion/current/tmp/scratch8226/Stream%20flow%20final.avi


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Define: deficiency

deficiency[dfns]npl-cies1.

- the state or quality of being deficient

- a lack or insufficiency; shortage

Back to Adjustment ofStreamflow Data slide


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Interpretation of DataPrevious slide

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