AWWA JAW53375

Dynamic variations in the chemical and isotopic character of the lower MissouriRiver can be explained primarily in terms of the relative contribution of lowerbasin waters in the river, which can be computed from gauging station data tovary from <5 to 86%. The endmember representing the lower basin component has anaverage electrical conductivity of 261 uS, a pH of 7.8, an alkalinity of 111mg/L, sulfate (SO4) of <5 mg/L, total organic carbon (TOC) of 5.9 mg/L, and ao18O value of -6.1, mostly similar to shallow meteoric groundwaters in Missouri.The endmember representing the upper basin has an average electrical conductivityof 814 uS, a pH of 8.2, an alkalinity of 191 mg/L, SO4 of 216 mg/L, TOC of 3.0mg/L, and a o18O value of -11.6. The normalized volumetric contributionsfacilitate geographic deliniation of nonpoint source pollutants such as TOC andoffer new ways to predict water quality and estimate annual loads. Includes 33 references, tables, figures.

Product Details

Edition:

Vol. 93 - No. 2

Published:

02/01/2001

Number of Pages:

11

File Size:

1 file , 580 KB