AWWA SOURCES55707

This study reviewed issues related to the implementation of a groundwater mound monitoring well (GMMW) concept; specifically, how to locate it under uncertain hydrogeological conditions of the mound. For this, a recharge site was selected in the City of Mesa, Arizona, that is characterized with near surface lenses of low permeability scattered throughout the mound. A geostatistical simulation technique was used for generating hydrogeological fields for the mound under the example site, using soil boring logs and other relevant data found in previous studies for the same site. More than 50 hydrogeological fields were generated and used for modeling. A software of vs2d was used for identifying the earliest wave of infiltration to the GMMW for each hydrogeological field generated. To provide a wide range of understanding and insight and also to conduct sensitivity analysis, five scenarios were formulated with varying parameter values and different initial and boundary conditions and each of them is modeled with the 50 fields. The study results are as follows: for this shallow recharge basin with a 40 feet vadose zone, the travel times of the earliest infiltration waves from surface to the GMMW were less then a day or so; the data requirement for estimating hydrogeologic condition was burdensome and expensive; it was difficult to locate one or a few GMMW's for sampling the earliest waves of the recharged water with more than a certain level of likelihood because of hydrogeologic and other uncertainties; and, all these results indicate that monitoring with the GMMW is practically limited. Includes 11 references, tables, figures.

Product Details

Edition:

Vol. - No.

Published:

01/01/2002

Number of Pages:

20

File Size:

1 file , 950 KB