Question

A well of 0.30 m diameter is pumped at a rate of 6000 m3/day for a long enough time that steady state conditions apply. an observation well located 30 m from the pumped well has been drawn down by 0.10m. another well at 100 m is drawn by 0.50 m. the well extends completely through an unconfined aquifer 30.0 m thick. determine:

a. the hydraulic conductivity k, and

b. the drawdown at the well

Answer 1

Contaminants in the ground waterSome of the most toxic contaminants are inorganic: lead, chromium, zinc, arsenic, cadmium, manganese,copper, barium, and Nickel.Many of the organic chemicals causing contamination in water do not dissolve well in the water.They arecalled non-aqueous phase liquids (NAPL). The presence of NAPL makes the task of restoring an aquifervery difficult or even impossible.The NAPL can be divided into two categories:Dense NAPL (DNAPL) thosedenserthan water. Examples of DNAPL include chlorinated solvents suchas trichloroethylene, tetrachloroethylene, polychlorinated biphenyl (PCBs),pesticides, polycyclic aromatichydrocarbons (PAHs).