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    Hydrology: Civil Engineering Faculty Hydraulics Division

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    Benay Diyarbakırlı
    The document provides two examples of analyzing precipitation data. The first example gives precipitation readings from a gauge over time and asks to draw the curve showing total precipitation over time and the hyetograph showing intensity over time. The second example provides annual precipitation readings from 8 gauges from 1951-1968 and asks to check for inconsistencies using a double mass curve and homogenize measurements before a certain date.

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    Hydrology: Civil Engineering Faculty Hydraulics Division

    Uploaded by

    Benay Diyarbakırlı
    15 views1 page
    The document provides two examples of analyzing precipitation data. The first example gives precipitation readings from a gauge over time and asks to draw the curve showing total precipitation over time and the hyetograph showing intensity over time. The second example provides annual precipitation readings from 8 gauges from 1951-1968 and asks to check for inconsistencies using a double mass curve and homogenize measurements before a certain date.

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    Exercises 2

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    The document provides two examples of analyzing precipitation data. The first example gives precipitation readings from a gauge over time and asks to draw the curve showing total precipitation over time and the hyetograph showing intensity over time. The second example provides annual precipitation readings from 8 gauges from 1951-1968 and asks to check for inconsistencies using a double mass curve and homogenize measurements before a certain date.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    15 views1 page

    Hydrology: Civil Engineering Faculty Hydraulics Division

    Uploaded by

    Benay Diyarbakırlı
    The document provides two examples of analyzing precipitation data. The first example gives precipitation readings from a gauge over time and asks to draw the curve showing total precipitation over time and the hyetograph showing intensity over time. The second example provides annual precipitation readings from 8 gauges from 1951-1968 and asks to check for inconsistencies using a double mass curve and homogenize measurements before a certain date.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 1

    ITU

    CIVIL ENGINEERING FACULTY HYDRAULICS DIVISION


    HYDROLOGY
    Examples –2 Analysis of Precipitation

    1. P1 precipitation gage has recorded the reading below during a storm. Accordingly
    a) Draw the curve which shows the variation of total precipitation with
    respect to time.
    b) Draw the curve showing the variation of precipitation intensity with
    respect to time (hyetograph).

    Time 02:16 02:20 02:22 02:25 02:27 02:30 02:32


    Total Precipitation (mm) 0,5 3,0 8.0 13.0 18.0 23.0 25.5

    2. The precipitation gage has recorded the reading below between 1951-68 years.
    a) Check the number of 8 precipitation gage with double mass curve.
    b) Homogenize the measurements of 8 precipitation before that date.

    Year 1 2 3 4 5 6 7 8 9 10
    1951 52 76 80 57 61 72 102 103 114 107
    1952 43 58 62 47 45 60 80 91 92 92
    1953 52 66 72 55 53 65 89 89 96 100
    1954 73 94 99 78 77 100 137 159 139 152
    1955 37 55 55 41 41 49 72 95 76 82
    1956 42 54 51 48 47 56 70 101 78 80
    1957 51 63 69 59 55 64 96 134 112 108
    1958 52 65 67 59 53 61 86 105 94 89
    1959 46 60 66 52 51 58 87 117 99 100
    1960 52 74 79 58 55 71 96 135 108 110
    1961 51 68 70 56 56 68 106 125 108 110
    1962 53 73 71 56 55 72 103 131 112 109
    1963 47 66 63 55 55 65 99 120 102 103
    1964 43 61 60 48 44 62 87 110 94 93
    1965 50 65 64 59 56 65 87 108 98 96
    1966 55 75 79 60 55 78 106 138 118 113
    1967 60 80 84 69 65 83 120 166 131 132
    1968 52 64 64 58 56 65 88 118 109 100

    HINTS:
    dP P
     i 
    dt t
    The curve showing the variation of precipitation intensity with time, is called hyetograph.
     Double Mass Curve Method: The annual precipitation of that gage is plotted on one
    axis, and the average annual precipitation of all the other gages in that region is plotted
    on the other axis, moving backwards in time and adding the annual precipitation of
    each year cumulatively.
     To homogenize the measurements before that date, they are multiplied by the ratio of
    the slopes of the lines before and after that date.

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