Two monitoring wells are installed along the flow path with the following characteristics. If a chemical tracer with a retardation factor of 5 takes 50 days to arrive at well 2, what would be the hydraulic gradient (unitless)? Porosity: 0.5 Hydraulic conductivity (K): 1000 m/day Distance between two wells: 5000 feet

With an observation well situated is 69.7 ft away from the pumping well (which is pumping at the rate of 305 gal/min). The aquifer is confined, and the depth has been measured from well logs and is 150 ft. please show using this data how to calculate transmissivity (T), the hydraulic conductivity (K) and Storativity (S) for the aquifer. Thank You s (m) t (sec) 20.7 4074.3 30.76 6054.6 46.3 9054.6 67.33 13254.6 107.26 21114 152.67 30054 209.37 41274 305.38 60114 451.68 88914 671.44 132174 946.07 186234 1321.9 260214

12 Determine the quantity of seepage under the dam cross section shown in m3/s/m if the soil has hydraulic conductivity, k=0.0001 meter cube per second. Note the numbers in the figure from left to right are:2.0m, 1.8m, 2.4m and 8.0 m, respectively. 2.00m 8.00 m 1.80 m Datum 12.40m 777 Enter your answer

DETERMINE: a. Rate of seepage into the well during pumping

Environmental Enginee... During a recuperative test, the water is pumped out 2.8 m initially and allowed to recuperate. It was observed that the water level rises by 1.45m in 80 minutes. If the diameter of the well is 3.45m, determine by what amount the diameter need to be increased to get a yield of 5 litre per sec under a depression head of 1.65m.

ENVIRONMENTAL ENGINEERING ( Practice Questions)   a). Suppose a well 0.36m in diameter has been pumped at a rate of 3,000cu.m/day for a long enough time that steady-state conditions apply. An observation well located 30m from the pumped well has been drawn down by 1.0m, and another well at 120m is drawn down by 0.4m. The pumped well extends completely through an unconfined aquifer 60.0m thick. GIVEN: For an unconconfined aquifer, Q =      πK(h2c1 – h2c2) / [Ln(r1 / r2)] Determine the hydraulic conductivity, K. (7 marks)   (ii) Estimate the drawdown at the pumped well. State any assumptions made.                           b). A confined aquifer 40.0 m thick has two monitoring wells spaced 400m apart along the direction of groundwater flow. The difference in water level in the wells is 4.0m (the difference in piezometric head). The hydraulic conductivity is 40m/day. Estimate the rate of flow per meter of distance perpendicular to the flow.    C). Suppose the aquifer, which has a…