boulton_solution_initial

Source: R/boulton_utilities.R

Function to calculate the initial values of the hydraulic parameters of the Boulton model

boulton_solution_initial(ptest)

Arguments

ptest

A pumping_test object

Value

A list with:

  • a: Slope of the straight line fitted to the drawdown data using the Cooper-Jacob approach

  • t0: Intercept of the straight line fitted to the drawdown data using the Cooper-Jacob approach (early time)

  • t1: Intercept of the straight line fitted to the drawdown data using the Cooper-Jacob approach (late time)

  • phi: Delay parameter. Dimensionless parameter defined as $$\phi = \frac{\alpha_{1} r^{2} S}{T}$$ where \(\alpha_{1}\) is a fitting parameter without a physical estimation, \(r\) is the distance between the pumping and observation well, \(S\) is the storage coefficient and \(T\) is the transmissivity.

References

Boulton, N. The drawdown of the water-table under non-steady conditions near a pumped well in an unconfined formation. Proceedings of the Institution of Civil Engineers, 1954, 3, 564-579

Examples

data(boulton)
ptest <- pumping_test("Well1", Q = 0.03, r = 20, t = boulton$t, s = boulton$s)
boulton.sol <- boulton_solution_initial(ptest)