📊 Input Data
Format: Time From (min), Time To (min), Water Drop (cm) — one reading per line, comma or tab separated
Horton's Equation: f(t) = fc + (f0 - fc) × e-kt
Where f0 = initial rate, fc = final rate, k = decay constant
Where f0 = initial rate, fc = final rate, k = decay constant
📈 Analysis Results
Enter your double ring infiltrometer data and click Analyze to see results.
Initial Rate (f₀)
--
cm/hr
Steady Rate (fc)
--
cm/hr
Decay Constant (k)
--
hr⁻¹
Derived Horton's Equation
f(t) = -- + -- × e--.--t
R² = --
--
Based on steady-state infiltration rate
| Time From (min) | Time To (min) | Interval (min) | Cumulative Time (hr) | Drop (cm) | Cumulative Drop (cm) | f Observed (cm/hr) | f Calculated (cm/hr) | f - fc | ln(f - fc) |
|---|
Linear Regression: ln(f - fc) vs Time
Method: The decay constant k is determined from the slope of the linear regression line when plotting ln(f - fc) against time. The equation ln(f - fc) = ln(f0 - fc) - kt gives a straight line with slope = -k.