Hydrogeologist workbench (ANSQUICK) > Stream-aquifer interactions

Hydraulic resistance of the river bottom is determined using measurements of water levels in the river and the two observation wells that are located along the line, that is perpendicular to the river. It is recommended that the first well is located at a distance from the river equal to the aquifer thickness. The second well is ideally located at the distance of 50-100 m from the first well.

"Stream bank" tab of "Monitoring data" dialog box.

Explanatory table for the tab "Stream bank"

"dL, m" text box	Information field displaying the calculated hydraulic resistance of river bed
"Ho, m" text box	Water level in the river
"H1, m" and "H2, m" text box	Hydraulic heads in the first and the second observation wells
"r1, m" and "r2, m" text box	Distances from the river to the first and the second observation wells

References

Опытно-фильтрационные работы. Под редакцией В.М. Шестакова и Д.Н. Башкатова. М.: Недра, 1974.

The solution assumes instantaneous water level rise in the river/lake. It can account for hydraulic resistance of the river bed, no-flow boundaries and downward leakage through the aquifer bottom.

"Flood" tab of "Monitoring data" dialog box.

Explanatory table for the tab "Flood"

"s, m" text box	Information field displaying the calculated change of water level in an observation well
"so, m" text box	Instantaneous change of water level in the river/lake
"t, day" text box	Time since the instantaneous change of water level
"r, m" text box	Distance from the river to an observation well
"r2, m" text box	Distance from the river to the second (perpendicular) river that is used for "Quadrant" aquifer option (see "Quadrant" option below)
"L, m" text box	Distance from the river to the no-flow boundary, that is parallel to the river, when "Boundary" option is selected.
"a, m^2/day" text box	Hydraulic diffusivity of the aquifer
"k, m/day" text box	Hydraulic conductivity of the aquifer. This parameter is used when hydraulic resistance of the river bed is included in calculations
"B, m" text box	Leakage factor. This parameter is required when option "Leaky" is checked.
"m', m" and "k', m/day" text box	Thickness and hydraulic conductivity of the river bottom. These parameters are required to account for hydraulic resistance of the river bottom.
"dL, m" text box	Information field displaying the calculated hydraulic resistance of the river bottom. If a value is entered in this field, the hydraulic conductivity of the river bottom, k', is recalculated
"Stream bank" option	When this option is checked, the solution accounts for hydraulic resistance of the river bed
"Boundary" option	This option switches on and off no-flow boundary that is parallel to the river
"Quadrant" option	This option switches on and off the second river, that is perpendicular to the first river
"Leaky" option	This option accounts for leakage through the bottom of the aquifer

References

Hall F.R., Moench A.F. Application of the convolution equation to stream-aquifer relationship // Water Resources Research. 1972. Vol. 8, N 2. P. 487–493.

Teloglou I.S., Bansal R.K. Transient solution for stream-unconfined aquifer interaction due to time varying stream head and in the presence of leakage // Journal of Hydrology. 2012. Vol. 428–429. P. 68–79.

"Flood-2" tab of "Monitoring data" dialog box.

Explanatory table for the tab "Flood-2"

"s, m" text box	Information field displaying changes of water level in a monitoring well: v – velocity of water level rise in the river, m/day; ε – recharge rate, m/day.
"ε, m/day" text box	Recharge rate
"t, day" text box	Time since beginning of changing water level in the river
"so, m" text box	Information field displaying water level changes in the river at a specific time t: s = vt
"v, m/day" text box	Velocity of water level change in the river
"r, m" text box	Distance from the river to a monitoring well
"a, m^2/day" text box	Hydraulic diffusivity of the aquifer
"S, –" text box	Confined storage coefficient of the aquifer
"T, m^2/day" text box	Information field that displays transmissivity of the aquifer: T = aS

References

Основы гидрогеологических расчетов. Ф.М. Бочевер, И.В.Гармонов, А.В.Лебедев, В.М.Шестаков. М., Изд-во «Недра», 1969.

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Stream-aquifer interactions

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Stream-aquifer interactions