AWWA QTC97052

This paper presents the results of a study of two major watersheds in southern California that was conducted to determine the relative levels, sources, and seasonal patterns of Cryptosporidium and Giardia in source lakes used as reservoirs for drinking water. A water sampling strategy was developed based on the potential sources of these pathogens in both watersheds and the major creeks draining into the lakes. The potential sources identified included wildlife, wastewater facilities, residential development, recreational use and livestock grazing. The sampling frequency and method of sampling were determined by the type of water flow and susceptibility to storm events. Monthly monitoring based on 100 L filtered samples was conducted to compare the seasonal occurrence of pathogens. Storm event samples were collected in devices positioned in creeks at gauging stations. The data obtained during this study will be used to review Metropolitan Water District of Southern California's current source water monitoring program and to assist in the implementation of watershed management strategies to control protozoa in source waters before they reach the reservoirs.

Product Details

Published:

01/01/1997

ISBN(s):

0898679583

Number of Pages:

9

File Size:

1 file , 38 KB