BEST AVAILABLE DATA: THE DANGER OF USING UNQUALIFIED NEAR REAL-TIME HYDROLOGIC DATA FOR SCIENCE

Computer applications developed in the last 2 decades have simplified surface-water analysis techniques so that anyone with a computer and the right software can process large quantities of streamflow data in a short period of time. Often these data are immediately posted to websites so they can be used for such diverse purposes as managing irrigation systems, regulating hydro-electric projects, and providing forecasters and early responders with flood warnings. Unfortunately, far too often the hydrologic data derived from such analyses are never subsequently reviewed for quality; instead, they are accepted as the best available data and find their way into analyses and publications for many water-related studies and projects.

This presentation will include a brief overview of the science of hydrographics and the importance of using established, accepted protocol for data collection and processing. Examples of several common problems with near real-time hydrologic data will also be discussed so users will be aware of errors associated with hydrologic data that have not been quality assured.

Helpful references:

Pelletier, P.M., 1988, Uncertainties in the single determination of river discharge: a literature review: Can. J. Civ. Eng. 15(5): 834-850.

Rantz, S.E. et al. 1982. Measurement and Computation of Streamflow: U.S.Geological Survey Water-Supply Paper 2175, 631 pp.