Explain the Rational method of peak runoff estimation. Write its assum

Question

Explain the Rational method of peak runoff estimation. Write its assumptions.

07 Jan 2025

Answer :

Word Count : 586

The Rational Method is a widely used technique for estimating peak runoff in small catchments or watersheds, especially for urban drainage design. This method helps in calculating the maximum rate of flow (discharge) that a specific area will experience during a rainfall event. The peak runoff is essential for designing stormwater management systems, such as culverts, drainage channels, and retention basins, ensuring they can handle the flow without causing flooding or erosion.

The formula for the Rational Method is given as:

\[
Q = C \times I \times A
\]

Where:
- \( Q \) is the peak discharge (cubic feet per second, cfs, or cubic meters per second, cms).
- \( C \) is the runoff coefficient, which accounts for the land use and surface characteristics (ranging from 0 to 1).
- \( I \) is the rainfall intensity (in _______ ___ __________ ____ ________ ________ ____ __________ ______.
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1.	Describe the entire process of hydrologic cylcle along with line diagram.
2.	Define infiltration. Describe the procedure of its measurements. Enlist different factors affecting infiltration.
3.	Explain the Rational method of peak runoff estimation. Write its assumptions.
4.	Define groundwater pollution. Describe the sources and impact of groundwater pollution.
5.	Write short notes any four of the following: (i) Runoff (ii) Evapotranspiration (iii) Seepage Losses (iv) Water budget (v) Disinfection Process at household level