A Stream Hydrograph: Over days and years, a stream's discharge varies greatly. When it's raining or during springtime snow melt, discharge will be higher than during dryer periods. A graph that displays how a stream discharge changes over time is called a Hydrograph.

You are going to construct a hydrograph from the data in the table below. The data is for the Russian river, near Guernerville in coastal northern California in early 1994. Drag the red symbol that represents discharge on a certain date from the table to the graph. Once you correctly plot up the 8 given points, click the "Add More Data" button to automatically plot up another 12 points from the same time period. Click the "Connect Points" button and then answer the questions below. (Only one point needs to be plotted in this "Demo" version.)

1. From the hydrograph above what is the approximate discharge before the storm even? cfs
2. What is the maximum discharge of the stream from the storm? cfs
3. For approximately how many days did the Russian River's discharge exceed 3000 cfs? days

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