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Need help estimating an area under a curve

  1. Dec 3, 2008 #1
    1. The problem statement, all variables and given/known data
    The graph is the graph of the rate of increase or decrease of the river throughout a 9 day period. At day 0 the height is at 111 feet. What day is the river crest at 114.4 feet.

    2. Relevant equations

    3. Attempt at Solution

    I know you have to estimate the area under the curve, I used rectangles and got a estimate between the 4th and 5th day. I am just asking if anyone got something similar to that or if I am way off. Thank you in advance
  2. jcsd
  3. Dec 3, 2008 #2


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    If you have the raw data there are a few numerical techniques that can do better ( see Newton-Raphson) but if you just have that chart then the best you can do is to count squares/triangles on paper - for more accuracy you just need smaller squares.
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