Skip to main content

CADDIS: A System to Help Investigators Determine the Causes of Biological Impairments in Aquatic Systems

Buy Article:

$17.50 plus tax (Refund Policy)

Or sign up for a free trial

Abstract:

Over a thousand water bodies in the United States are listed by states as biologically impaired. For many of these, the cause of the impairment is also reported as “unknown”. Before an appropriate Total Maximum Daily Load (TMDL) can be formulated, the cause of the biological impairment, for example, excess fine sediments, nutrients, or toxic substances, must be determined. Defensible causal analyses require knowledge of the mechanisms, symptoms, and stressor-response relationships for various specific stressors as well as the ability to use that knowledge to draw appropriate conclusions. This paper describes the first version of the Causal Analysis/Diagnosis Decision Information System (CADDIS). CADDIS is a web-based decision support system that will help investigators in the regions, states and tribes find, access, organize and share information useful for causal evaluations in aquatic systems. It is based on the USEPA's Stressor Identification process, which is a formal method for identifying causes of impairments in aquatic systems. Current features of CADDIS include a step-by-step guide to conducting a causal analysis, downloadable worksheets and examples, a library of conceptual models, and links to helpful information. Future plans include modules on deriving empirical stressor-response relationships; stressor-specific tolerance values; and databases and syntheses of relevant literature on sediments and toxic metals. Future versions will be developed incrementally and iteratively, and frequent user input and feedback will be essential to the system's success.

Document Type: Research Article

DOI: https://doi.org/10.2175/193864705783967584

Publication date: 2005-01-01

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Ingenta Connect is not responsible for the content or availability of external websites
  • Access Key
  • Free ContentFree content
  • Partial Free ContentPartial Free content
  • New ContentNew content
  • Open Access ContentOpen access content
  • Partial Open Access ContentPartial Open access content
  • Subscribed ContentSubscribed content
  • Partial Subscribed ContentPartial Subscribed content
  • Free Trial ContentFree trial content
Cookie Policy
X
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more