Environmental Monitoring and Assessment

, Volume 63, Issue 1, pp 95–113 | Cite as

Designing a Spatially Balanced, Randomized Site Selection Process for Regional Stream Surveys: The EMAP Mid-Atlantic Pilot Study

  • Alan T. Herlihy
  • David P. Larsen
  • Steven G. Paulsen
  • N. Scott Urquhart
  • Barbara J. Rosenbaum
Article

Abstract

In 1993, the U.S. Environmental Protection Agency (EPA), as part of the Environmental Monitoring and Assessment Program (EMAP), initiated a sample survey of streams in the mid-Atlantic. A major objective of the survey was to quantify ecological condition in wadeable streams across the region. To accomplish this goal, we selected 615 stream sites using a randomized sampling design with some restrictions. The design utilized the digitized stream network taken from 1:100,000-scale USGS topographic maps as the sample frame. Using a GIS, first- through third-order (wadeable) stream segments in the sample frame were randomly laid out in a line and sampled at fixed intervals after a random start. We used a variable probability approach so that roughly equal numbers of first-, second-, and third-order stream sites would appear in the sample. The sample design allows inference from the sample data to the status of the entire 230,400 km of wadeable stream length in the mid-Atlantic study area. Of this mapped stream length, 10% was not in the target population because no stream channel existed (4%), the stream channel was dry (5%), or the stream was not wadeable (1%). We were unable to collect field data from another 10% of the mapped stream length due to lack of access (mostly landowner denials). Thus, the field data we collected at 509 sites allows inference to the ecological condition for 184,600 km of the mapped stream length in the region.

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References

  1. Cassel, C.M., Sarndal, C.E. and Wretman, J.H.: 1977, Foundations of Inference in Survey Sampling, John Wiley & Sons, New York, 192 pp.Google Scholar
  2. Cochran, W.G.: 1977, Sampling Techniques, 3rd ed., John Wiley & Sons, New York, 428 pp.Google Scholar
  3. Herlihy, A.T., Stoddard, J.L. and Burch-Johnson, C.: 1998, ‘The Relationship Between Stream Chemistry and Watershed Land-Cover Data in the Mid-Atlantic Region, U.S.’, Water Air Soil Pollut. 105, 377-386.Google Scholar
  4. Horn, C.R. and Grayman, W.M.: 1993, ‘Water-quality modeling with the EPA reach file system’, J. Water Resources Plan. Manage. 119, 262-274Google Scholar
  5. Hynes, H.B.N.: 1975, ‘Edgardo Baldi Memorial Lecture: The Stream and Its Valley’, Verh. Inernat. Verein. Limnol. 19, 1.Google Scholar
  6. Kaufmann, P.R., Herlihy, A.T., Mitch, M.E., Messer, J.J. and Overton, W.S.: 1991, ‘Chemical Characteristics of Streams in the Eastern United States: I. Synoptic Survey Design, Acid-Base Status and Regional Chemical Patterns’, Water Resour. Res. 27, 611-627.Google Scholar
  7. Kish, L.: 1965, Survey Sampling, John Wiley & Sons, New York, 643 pp.Google Scholar
  8. Larsen, D.P., Thornton, K.W., Urquhart, N.S. and Paulsen, S.G.: 1994, ‘The Role of Sample Surveys for Monitoring the Condition of the Nation's Lakes’, Environ. Monit. Assess. 32, 101-134.Google Scholar
  9. Landers, D.H., Overton, W.S., Linthurst, R.A. and Brakke, D.F.: 1988, ‘Eastern Lake Survey: Regional Estimates of Lake Chemistry’, Environ. Sci. Technol. 22, 128-135.Google Scholar
  10. Lazorchak, J.L., Klemm, D.J. and Peck, D.V. (eds.): 1998, Environmental Monitoring and Assessment Program — Surface Waters: Field Operations and Methods for Measuring the Ecological Condition of Wadeable Streams, EPA/620/R-94/004F, U.S. EPA, Washington DC.Google Scholar
  11. Messer, J.J., Linthurst, R.A. and Overton, W.S.: 1991, ‘An EPA Program for Monitoring Ecological Status and Trends’, Environ. Monit. Assess. 17, 67-78.Google Scholar
  12. Overton, W.S., White, D. and Stevens, D.L., Jr.: 1991, Design Report for EMAP, the Environmental Monitoring and Assessment Program, EPA/600/3-91/053, U.S. EPA, Washington DC.Google Scholar
  13. Paulsen, S.G., Hughes, R.M. and Larsen, D.P.: 1998, ‘Critical Elements in Describing and Understanding Our Nation's Aquatic Resources’, J. Amer. Water Works Assoc. 34, 995-1005.Google Scholar
  14. Stehman, S.V. and Overton, W.S.: 1994, ‘Environmental Sampling and Monitoring’, pp. 263-305 in G.P. Patil and C.R. Rao (eds.), Handbook of Statistics 12, Elsevier Science, Amsterdam.Google Scholar
  15. Stevens, D.L., Jr.: 1994, ‘Implementation of a National Environmental Monitoring Program’, J. Environ. Manage. 42, 1-29.Google Scholar
  16. Stevens, D.L., Jr.: 1997, ‘Variable Density Grid-Based Sampling Designs for Continuous Spatial Populations’, Environmetrics 8, 167-195.Google Scholar
  17. Urquhart, N. S., Paulsen S.G. and Larsen, D.P.: 1998, ‘Monitoring for Regional and Policy-Relevant Trends Over Time’, Ecol. Applic. 8, 246-257.Google Scholar
  18. USEPA: 1994, National Water Quality Inventory: 1992 Report to Congress, EPA/841/R-94/001, Office of Water, Washington DC.Google Scholar
  19. Vannote, R.L., Minshall, G.W., Cummins, K.W., Sedell, J.R. and Cushing, C.E.: 1980, ‘The River Continuum Concept’, Can. J. Fish. Aq. Sci. 37, 130-137.Google Scholar

Copyright information

© Kluwer Academic Publishers 2000

Authors and Affiliations

  • Alan T. Herlihy
    • 1
  • David P. Larsen
    • 2
  • Steven G. Paulsen
    • 2
  • N. Scott Urquhart
    • 3
  • Barbara J. Rosenbaum
    • 4
  1. 1.Department of Fisheries & WildlifeOregon State University, c/o USEPACorvallisUSA
  2. 2.U.S. Environmental Protection Agency, NHEERL-WEDCorvallisUSA
  3. 3.Department of StatisticsOregon State UniversityCorvallisUSA
  4. 4.OAO Corp.c/o U.S. EPACorvallisUSA

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