Home
Back
Formula Used:
| From: | To: |
The formula calculates the area of catchment based on equilibrium discharge and duration of excess rainfall. It provides a mathematical relationship between these hydrological parameters to determine the geographical area that contributes water flow to a particular point.
The calculator uses the formula:
Where:
Explanation: The formula establishes the proportional relationship between catchment area, steady discharge rate, and rainfall duration, with 2.778 as the conversion factor.
Details: Accurate catchment area calculation is crucial for hydrological studies, flood prediction, water resource management, and designing drainage systems and water storage facilities.
Tips: Enter equilibrium discharge in m³/s and duration of excess rainfall in seconds. Both values must be positive numbers greater than zero for accurate calculation.
Q1: What is equilibrium discharge?
A: Equilibrium discharge is the steady flow rate that a well can sustain from an aquifer over an extended period without causing significant drawdown or depletion of the aquifer.
Q2: How is duration of excess rainfall measured?
A: Duration of excess rainfall is the time during which continuous rain is observed, or occurs, at a given point or within a given area, typically measured in seconds.
Q3: What units should be used for input values?
A: Equilibrium discharge should be in cubic meters per second (m³/s) and duration of excess rainfall should be in seconds for consistent results.
Q4: What are typical values for catchment areas?
A: Catchment areas can vary significantly from small urban watersheds of a few square meters to large river basins covering thousands of square kilometers.
Q5: Are there limitations to this formula?
A: This formula provides an estimation and may need adjustment based on specific hydrological conditions, soil types, and topography of the catchment area.