Hydrologic Data Collection and Water Quality Sampling The web address to this site is http://www.ars.usda.gov/spa/hydro-collection Publications Related to Measurement Uncertainty: Harmel, R.D. , D.R. Smith, K.W. King, and R.M. Slade. 2009. Estimating storm discharge and water quality data uncertainty: A software tool for monitoring and modeling applications. Environmental Modelling & Software 24:832-842. Publication Harmel, R.D. and P.K. Smith. 2007. Consideration of measurement uncertainty in the evaluation of goodness-of-fit in hydrologic and water quality modeling. Journal of Hydrology 337:326-336. Publication Harmel, R.D. , R.J. Cooper, R.M. Slade, R.L. Haney, and J.G. Arnold. 2006. Cumulative uncertainty in measured streamflow and water quality data for small watersheds. Transactions of ASABE 49(3):689-701. Publication Publications Related to Methods: Toor, G. S., R.D. Harmel, B. E. Haggard, and G. Schmidt. 2008. Evaluation of regression methodology with low-frequency water quality sampling to estimate constituent loads for ephemeral watersheds in Texas. J. Environ. Qual. 37: 1847-1854. Publication Harmel, R. D., K.W. King, B.E. Haggard, D.G. Wren, and J.M. Sheridan. 2006. Practical Guidance for Discharge and Water Quality Data Collection on Small Watersheds. Transactions of ASABE 49(4):937-948. Publication Harmel, R.D. and B.E. Haggard. 2006. Edge-of-Field and Small Watershed Data Collection to Support Phosphorus Modeling. In: Modeling Phosphorus in the Environment, D.E. Radcliffe (ed), pp. 383-401. Publication King, K.W., R.D. Harmel , and N.R. Fausey. 2005. Development and sensitivity of a method to select time- and flow-paced storm event sampling intervals for headwater streams. Journal of Soil and Water Conservation 60(6):323-331. Publication Harmel, R.D. and K.W. King. 2005. Uncertainty in measured sediment and nutrient flux in runoff from small agricultural watersheds. Transactions of ASAE 48(5):1713-1721. Publication King. K.W. and R.D. Harmel. 2004. Comparison of Time-Based Sampling Strategies to Determine Nitrogen Loading in Plot-Scale Runoff: Technical Note. Transactions of ASAE 47(5):1457-1463. Publication Harmel, R.D. , K.W. King, and R.M. Slade. 2003. Automated Storm Water Sampling on Small Watersheds. Applied Engineering in Agriculture 19(6):667-674. Publication King, K.W. and R.D. Harmel . 2003. Considerations in Selecting a Water Quality Sampling Strategy. Transactions of the American Society of Agricultural Engineers 46(1):63-73. Publication Harmel, R.D. , K.W. King, J.E. Wolfe, and H.A. Torbert. 2002. Minimum Flow Considerations for Automated Storm Sampling on Small Watersheds. Texas Journal of Science 54(2):177-188. Publication       Last Modified: 11/23/2009