CVEN9630: A slug test analysis was performed on a piezometer in a sandy unit. Fig. 1 shows the water level response after the pressure: Groundwater Hydrology Assignment, UNSW

Question 1

A slug test analysis was performed on a piezometer in a sandy unit. Fig. 1 shows the water level response after the pressure in a piezometer is released. Measurements depicted by the dots in Fig. 1 are also recorded in Table 1. The construction details of the piezometer are as follows: The outside casing and screen diameter (2∙ 𝑅) is 6 cm, while the casing wall thickness is 5 mm. The screen length is 1.5 m. The mean aquifer grain size d50 = 1 mm.

Use the data provided in the table to calculate the hydraulic conductivity of the aquifer.
Calculate the maximum velocity at which the water enters the piezometer screen.
Does Darcy’s law apply? If not, how else could the slug test be evaluated?

Question 2

The objective is to use an Excel spreadsheet to investigate various boundary conditions for a simple rectangular confined aquifer. The aquifer heads and flow are modeled using a finite difference scheme based on the analysis of Frank and Reilly [1987]. In Excel, you need to set up an aquifer model of an area 1100 m wide (in the x-direction) by 1400 m long (in the y-direction). Use a finite difference discrimination where ∆x = ∆y = 100 m. Your model will then be 12 nodes wide in the x-direction (extending from node 0 to node 11) and 15
nodes long in the y-direction (extending from node 0 to node 14). Assume that the aquifer transmissivity is 300 m2/day. The upper left corner is labeled A, and the other corners are B, C, and D (in a clockwise direction).

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