Home
Back
S-Curve Addition Formula:
| From: | To: |
S-Curve Addition is a method or concept related to the analysis and interpretation of pumping test data and used for the construction of S-curves in hydrogeology and hydrology studies.
The calculator uses the S-Curve Addition formula:
Where:
Explanation: This formula calculates the difference between the S-curve value at a specific time and the ordinates of the unit hydrograph, which is essential for analyzing groundwater behavior and runoff responses.
Details: S-Curve Addition is crucial for understanding groundwater drawdown/recovery patterns and analyzing hydrological responses to rainfall events. It helps in constructing accurate S-curves for pumping test interpretation and hydrograph analysis.
Tips: Enter both S-Curve at Time 't' and Ordinates of Unit Hydrograph values in hours. Both values must be non-negative numbers. The calculator will compute the difference between these two values.
Q1: What is an S-curve in hydrogeology?
A: An S-curve represents the cumulative drawdown or recovery of groundwater levels over time during pumping or injection tests, showing the aquifer's response to these activities.
Q2: What are ordinates of unit hydrograph?
A: Ordinates of unit hydrograph are the runoff discharge values over time after a unit input of effective rainfall, showing how runoff responds and peaks after a storm event.
Q3: When is S-curve addition used?
A: S-curve addition is used in pumping test analysis, groundwater modeling, and hydrological studies to construct composite S-curves and analyze aquifer responses.
Q4: What are typical units for these measurements?
A: Both S-curve values and unit hydrograph ordinates are typically measured in hours, though specific applications may use different time units.
Q5: Can this calculator handle negative results?
A: Yes, the calculator can produce negative results if the ordinates value exceeds the S-curve value, which may indicate specific hydrological conditions.