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The Kuichlings formula when the storm occurs once in 10 years is _____
  • a)
    R = 2667/(t + 50)
  • b)
    R = 260/(t + 20)
  • c)
    R = 2667/(t + 20)
  • d)
    R = 260/t
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The Kuichlings formula when the storm occurs once in 10 years is _____...
The Kuichlings formula when the storm occurs once in 10 years is R = 2667/(t - 20)

To understand the formula, let's break it down step by step:

1. The Kuichlings formula:
The Kuichlings formula is a method used to determine the peak flow rate of a stormwater runoff. It calculates the peak flow rate based on the time of concentration (t) and other factors such as the catchment area and the intensity of the storm.

2. R and t:
In the formula, R represents the peak flow rate in cubic feet per second (cfs), and t represents the time of concentration in minutes. The time of concentration is the time it takes for water to travel from the furthest point in a catchment area to the outlet.

3. Storm occurrence:
The given question mentions that the storm occurs once in 10 years. This means that the formula is specifically designed to calculate the peak flow rate for a storm event with a 10-year recurrence interval.

4. The formula:
Based on the given information, the correct formula is R = 2667/(t - 20). Let's understand the components of the formula:

- 2667: This is a constant value used in the formula. It represents the average rainfall intensity in cubic feet per second per square mile for a 10-year storm event.

- (t - 20): This is the time of concentration minus 20 minutes. The value of 20 minutes is subtracted to account for the initial abstraction or the time it takes for the water to start flowing after the rainfall begins.

5. Application and interpretation:
To apply the formula, you need to know the time of concentration for a specific catchment area. Once you have the value of t, you can plug it into the formula to calculate the peak flow rate (R) for a 10-year storm event.

The formula is derived based on empirical data and statistical analysis of rainfall patterns. It provides a reliable estimate of the peak flow rate, which is crucial for designing stormwater management systems, such as culverts, drains, and detention basins, to handle the expected runoff during a storm event.
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Community Answer
The Kuichlings formula when the storm occurs once in 10 years is _____...
According to Kuichling, when the storm occurs once in 10 years, the rainfall intensity R is given by R = 260/(t + 20) and when it occurs once in 15 years, it is given by R = 3048/(t + 20) where t is the duration of storm in minutes.
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