f one week the water level was 1.0 foot above sea level. The water pumped during the week was consistently fresh with no signif
There is a water supply well in an unconfined sand aquifer in Cape Cod near the shore. It has a screened section that extends from 25 to 45 feet below sea level. Without pumping, the water level in the well is 7.0 feet above sea level. The well was pumped at a steady discharge, and by the end of one week the water level was 1.0 foot above sea level. The water pumped during the week was consistently fresh with no significant change in salinity. Density of seawater is 1.025 g/cm3. Density of freshwater is 1.000 g/cm3
a) sketch the problem and estimate the level of the saltwater interface at the location of the well before and after the week of pumping.
b) proceed with the calculation as if the conditions related to the Ghyben-Herzberg equation apply.
c) Using the equation above, does the problem violate any of the following and if so why: The interface between the fresh and saltwater is sharp with no mixing, There is no resistance to vertical flow in the saltwater or the freshwater (hydrostatic principles apply), or At the shoreline, the freshwater head equals sea level.
Step by step
Solved in 3 steps with 3 images
