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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.
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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.
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Define: deficiency
deficiency[dfns]npl-cies1.
- the state or quality of being deficient
- a lack or insufficiency; shortage
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Interpretation of DataPrevious slide