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Extra info for A review of the USGS National Water Quality Assessment Pilot Program

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Once collected, monitoring data can be used to evaluate the model, and if warranted, to guide its improvement. This in turn may lead to additional monitoring requirements. This iterative use of models is an essential element of a processoriented assessment, and is discussed further in the Analytical Framework section later in this report. Summary The committee believes that an assessment of the long-term trends in the water quality of lakes (including impoundments) and estuaries should be part of any long-term national water quality assessment.

Chicot-Evangeline 30. Lower Tennessee River Basin USGS Central Region 31. Eastern Iowa Basins 32. Ozark Plateau 33. Central Oklahoma 34. Trinity River Basin 35. Balcones Fault Zone 36. Central Nebraska 37. Kansas River Basin 38. Upper Arkansas River Basin 39. Central High Plains 40. Southern High Plains 41. South Platte River Basin 42. North Platte River Basin 43. Cheyenne and Belle Fourche Basins 44. Yellowstone Basin 45. Upper Colorado Basin 46. Rio Grande Valley 47. Northern Rockies Intermontane Basins 48.

Please use the print version of this publication as the authoritative version for attribution. NAWQA DESIGN EVALUATION 26 2 NAWQA Design Evaluation INTRODUCTION As discussed in the previous chapter, the scope of a truly national water quality assessment is enormous, both in scale and complexity. Hence, it is essential that the scope of NAWQA be defined judiciously in recognition of the overall budgetary constraints, the organizational strength of the USGS, and the salient characteristics of the physical and cultural systems that define water quality.

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