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RUNOFF ESTIMATION BY USING RATIONAL METHOD: A REVIEW

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Shyamsunder Burra at Lovely Professional University
Shyamsunder Burra
Kannala Vishnuvardhanreddy
Kannala Vishnuvardhanreddy
Kannala Vishnuvardhanreddy
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ABSTRACT The rational method is used to evaluate the surface runoffs on peak stages occurred at small areas like field lands, parking spots, public parks etc. This method does not provide any accurate infiltration rate. In this method we observe especially water movements and their inputs through hydrological cycle. By using of this method there is no timing collaboration between the peak flow. KEYWORDS: Rational Method
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RUNOFF ESTIMATION BY USING RATIONAL METHOD: A REVIEW
Burra Shyamsunder, Kannala Vishnuvardhanreddy, Dr Sandeepmenon
Research Scholar, Department of Agronomy, School of Agriculture, Lovely Professional University, Jalandhar, Punjab,
India - 144411
ABSTRACT
The rational method is used to evaluate the surface runoffs on peak stages occurred at small areas like field lands, parking
spots, public parks etc. This method does not provide any accurate infiltration rate. In this method we observe especially
water movements and their inputs through hydrological cycle. By using of this method there is no timing collaboration
between the peak flow.
KEYWORDS:
Rational Method
Article History
Received: 17 Mar 2021 | Revised: 19 Mar 2021 | Accepted: 24 Mar 2021
INTRODUCTION
Rational method was first used in 1889 developed by Emil Kuichling. The Rational equation is easiest method to obtain
peak runoff from watershed. The most common and quickest method of runoff estimation. The rational method is the
oldest method still probably the most widely used method for design of storm drains. This method is for small areas,
especially the size of the drainage basin fixed to a few acres
1
RUNOFF ESTIMATION BY USING RATIONAL METHOD
Rational Equation: Q = CIA
Where, Q = peak discharge, CFS
C = Runoff Coefficient (Rational Method)
I = Rainfall Intensity, mm/hour
A = Drainage Area
International Journal of Applied and
Natural Sciences (IJANS)
ISSN (P): 2319–4014; ISSN (E): 2319–4022
Vol. 10, Issue 3, Apr–May 2021; 1–4
© IASET
2
Burra Shyamsunder, Kannala Vishnuvardhanreddy, Dr Sandeepmenon
Impact Factor (JCC): 6.3238 NAAS Rating 3.73
Table 1: Calculation of C Value
Land Use Area Value of C Area* C
Final Value of C
Agriculture 2750.11 0.0605 166.382
Built-up 46.25 0.0625 2.89063
Forest 2.336 0.15 0.3504
Grassland 5.14 0.0175 0.08995 0.06
Wastelands 526.95 0.05 26.3475
Water bodies 103.81 0.095 9.86195
Wet lands 1.11 0.9 0.999
Other 39.19 0.2 7.838
Total 3474.89 214.759
Table 2: Calculation of Runoff from Rational Formula
Month Average Rainfall of all
Stations (mm) Average Intensity of
Rainfall(mm) Area (km2) Q = CIA(mm)
June 134.054 0.335 69.874
July 212.897 0.515 107.390
August 136.965 0.331 3474.92 69.0885
September 96.261 0.240 50.175
October 16.193 0.039 8.1697
Figure 1
LIMITATIONS
• It suppose that rainfall intensity is constant over the whole watershed throughout the period of the storm, which is
very rare.
• The foremost losses due to decline storage and foremost infiltration are not allowed.
• Runoff coefficient changes with regards to season as well as rainfall attributes, which is not allowed in rational
formula.
• The considerable flaw to the Rational method is that it generally allows only one point on the runoff hydrograph.
Runoff Estimation by using Rational Method: A Review
3
www.iaset.us editor@iaset.us
Figure 2
CONCLUSIONS
This is a simple method to estimate the runoff in small areas by using `c’ value or runoff coefficient. It is much easier to
represent variation in hydrological responses within that area. It is also used to calculate accurate evaluations than other
models.
REFERENCES
1. University Cooperation of Atmospheric Research. https://www.ucar.edu/privacy-notice.
2. David B. Thompson. The Rational Method, Texas Tech University
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