Friday , August 18 2017
Home / Articles / Agri Engineering / Runoff Coefficient

Runoff Coefficient




  • Runoff Coefficient is the ratio of between the peak runoff rate and intensity of rainfall.

    The Rational Method is based upon following Two Assumptions:

    1. Rainfall occurs at uniform intensity for duration at least equal to the time of concentration of watershed.

    2. Rainfall occurs at a uniform intensity over the entire area of watershed.
    The value of ‘C’ runoff coefficient in the rational formula should be taken from following table.

     

    vegetative cover and land Slope

    Soil Texture

     

    Sand Loam

    Clay and Silt Loam

    Silty Clay

    1. Wood Land

     

     

     

    0 – 5 % slope

    0.10

    0.30

    0.40

    5 – 10% slope

    0.25

    0.35

    0.60

    10 – 30% slope

    0.30

    0.50

    0.60

    2. Pasture land

     

     

     

    0 – 5 % slope

    0.10

    0.30

    0.40

    5 – 10% slope

    0.16

    0.36

    0.55

    10 – 30% slope

    0.22

    0.42

    0.60

    3. Cultivated Land

     

     

     

    0 – 5 % slope

    0.30

    0.50

    0.60

    5 – 10% slope

    0.40

    0.60

    0.70

    10 – 30% slope

    0.52

    0.72

    0.82

    Source

    About admin

    Check Also

    Water resources of Pakistan under current changing climatic scenario

    Report Issue: * Suggest Edit Copyright Infringment Claim Article Invalid Contents Broken Links Your Name: …

    Leave a Reply

    Be the First to Comment!

    Notify of
    avatar
    wpDiscuz