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A graphical screening method for assessing stream water quality using specific conductivity and alkalinity data.

Abstract：

:In areas of varying geology, it is difficult to infer water quality from specific conductance or electrical conductivity (EC) data without an understanding of the expected range of EC values based on local bedrock composition. This paper describes a user-friendly graphical screening method that addresses this issue by plotting the EC against concurrent alkalinity data, which correlates well with the presence of carbonate bedrock under natural conditions, and thus serves as an index of bedrock type. The upper limit of EC vs. alkalinity expected in a stream is determined using regional groundwater quality data, based on the assumption that stream chemistry reflects groundwater under baseflow conditions. Stream samples with EC/alkalinity values that consistently plot above this limit are considered impacted by anthropogenic sources. The effect of dilution and runoff on the EC vs. alkalinity plot of stream samples is considered using a simple baseflow/storm runoff-mixing model. The graphical method's utility as a screening tool is demonstrated by application to stream chemistry data from watersheds of southeastern Pennsylvania and northwestern New Jersey in several distinct geologic settings; however the method is general and widely applicable to watersheds in humid temperate regions. Its use is intended for watershed stewards of both professional and nonprofessional qualification.

journal_name

J Environ Manage

journal_title

Journal of environmental management

authors

Kney AD,Brandes D

doi

10.1016/j.jenvman.2006.01.014

subject

Has Abstract

pub_date

2007-03-01 00:00:00

pages

519-28

issue

4

eissn

0301-4797

issn

1095-8630

pii

S0301-4797(06)00065-X

journal_volume

82

pub_type

杂志文章

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