Runoff Coefficient For Peak Rate Of Runoff Calculator

Formula Used:

\[ \text{Runoff Coefficient for Burkli Zeigler} = \frac{455 \times \text{Peak Rate of Runoff for Burkli Zeigler}}{\text{Intensity of Rainfall in Burkli Zeigler} \times \sqrt{\text{Slope of the ground} \times \text{Drainage Area}}} \]

Peak Rate of Runoff for Burkli Zeigler:

m³/s

Intensity of Rainfall in Burkli Zeigler:

m/s

Slope of the ground:

m/1000m

Drainage Area:

m²

Runoff Coefficient for Burkli Zeigler:

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1. What is the Runoff Coefficient for Burkli Zeigler?

The Runoff Coefficient for Burkli Zeigler is a dimensionless coefficient that relates the amount of runoff to the amount of precipitation received. It is used in hydrological calculations to estimate peak runoff rates from rainfall events.

2. How Does the Calculator Work?

The calculator uses the Burkli Zeigler formula:

\[ \text{Runoff Coefficient} = \frac{455 \times \text{Peak Rate of Runoff}}{\text{Intensity of Rainfall} \times \sqrt{\text{Slope of the ground} \times \text{Drainage Area}}} \]

Where:

Peak Rate of Runoff — Maximum discharge rate during runoff (m³/s)
Intensity of Rainfall — Amount of rainfall per unit time (m/s)
Slope of the ground — Ground slope measurement (m/1000m)
Drainage Area — Total surface area contributing to runoff (m²)
455 — Empirical constant in the Burkli Zeigler formula

Explanation: The formula calculates the runoff coefficient by considering peak runoff rate, rainfall intensity, ground slope, and drainage area characteristics.

3. Importance of Runoff Coefficient Calculation

Details: Accurate runoff coefficient estimation is crucial for hydrological modeling, flood prediction, urban drainage design, and watershed management. It helps in understanding how much rainfall becomes surface runoff versus infiltration.

4. Using the Calculator

Tips: Enter peak runoff rate in m³/s, rainfall intensity in m/s, ground slope in m/1000m, and drainage area in m². All values must be positive numbers greater than zero for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical range for runoff coefficients?
A: Runoff coefficients typically range from 0 (all rainfall infiltrates) to 1 (all rainfall becomes runoff), with urban areas having higher coefficients (0.7-0.95) and natural areas having lower coefficients (0.05-0.3).

Q2: How does ground slope affect runoff coefficient?
A: Steeper slopes generally result in higher runoff coefficients as water has less time to infiltrate and flows more quickly over the surface.

Q3: What factors influence the runoff coefficient?
A: Soil type, land use, vegetation cover, antecedent moisture conditions, and rainfall intensity all significantly influence the runoff coefficient.

Q4: When is the Burkli Zeigler method most appropriate?
A: The Burkli Zeigler method is particularly useful for small to medium-sized watersheds and is commonly applied in urban drainage design and flood estimation studies.

Q5: How does this differ from other runoff estimation methods?
A: The Burkli Zeigler method provides a specific approach that incorporates slope and drainage area directly into the runoff coefficient calculation, making it particularly suited for areas with significant topographic variation.