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United States Department of Agriculture

Agricultural Research Service

Daren Harmel

Supervisory Agricultural Engineer


Publications (Clicking on the reprint icon Reprint Icon will take you to the publication reprint.)
Environmental impacts of in-house windrow composting of broiler litter prior to land application in subtropical/semi-arid conditions - (Peer Reviewed Journal) - (26-Feb-14)
Evaluating, interpreting, and communicating performance of hydrologic/water quality models considering intended use: A review and recommendations - (Peer Reviewed Journal)
Harmel, R.D., Smith, P.K., Migliaccio, K.W., Chaubey, I., Douglas-Mankin, K.R., Benham, B., Shukla, S., Munoz-Carpena, R., Robson, B.J. 2014. Evaluating, interpreting, and communicating performance of hydrologic/water quality models considering intended use: A review and recommendations. Environmental Modelling & Software. 57:40-51.
A framework for propagation of uncertainty contributed by parameterization, input data, model structure, and calibration/validation data in watershed modeling - (Peer Reviewed Journal)
Yen, H., Wang, X., Fontane, D.G., Harmel, R.D., Arabi, M. 2014. A framework for propagation of uncertainty contributed by parameterization, input data, model structure, and calibration/validation data in watershed modeling. Journal of Environmental Modeling and Software. 54:211-221.
Re-defining and quantifying inorganic phosphate pools in the Soil and Water Assessment Tool - (Peer Reviewed Journal)
Haney, R.L., White, M.J., Arnold, J.G., Haney, E.B., Harmel, R.D. 2013. Re-defining and quantifying inorganic phosphate pools in the Soil and Water Assessment Tool. Journal of Soil Science and Environmental Management. 4(8):155-162.
Effects of long-term poultry litter application on inorganic and enzyme hydrolyzable P of Texas Blackland Vertisol - (Abstract Only)
Pagliari, P., Waldrip, H., He, Z., Harmel, R.D., Zhang, M. 2013. Effects of long-term poultry litter application on inorganic and enzyme hydrolyzable P of Texas Blackland Vertisol. ASA-CSSA-SSSA Annual Meeting Abstracts. poster number 1016.
Impact of management practices on water extractable organic carbon and nitrogen from a poultry litter-amended soil - (Abstract Only)
Zhang, M., He, Z., Waldrip, H., Pagliari, P., Harmel, R.D. 2013. Impact of management practices on water extractable organic carbon and nitrogen from a poultry litter-amended soil. ASA-CSSA-SSSA Annual Meeting Abstracts. poster number 2733.
Chapter 5: Quality assurance/quality control in stormwater sampling - (Book / Chapter)
McCarthy, D., Harmel, R.D. 2014. Chapter 5: Quality assurance/quality control in stormwater sampling. In: Zhang, C., Mueller, J., Mortimer, M., editors. Quality Assurance & Quality Control of Environmental Field Sampling. London, UK: Future Science. p. 99-127.
Effects of an off-stream watering facility on cattle behavior and instream E. coli levels - (Peer Reviewed Journal)
Wagner, K.L., Redmon, L.A., Gentry, T.J., Harmel, R.D., Knight, R., Jones, C.A., Foster, J.L. 2013. Effects of an off-stream watering facility on cattle behavior and instream E. coli levels. Texas Water Journal. 4(2):1-13.
Initial field evaluation of the agro-economic effects of determining nitrogen fertilizer rates with a recently-developed soil test methodology - (Peer Reviewed Journal)
Harmel, R.D., Haney, R.L. 2013. Initial field evaluation of the agro-economic effects of determining nitrogen fertilizer rates with a recently-developed soil test methodology. Open Journal of Soil Science. 3:91-99.
Conservation effects on nutrient delivery from the Mississippi River to the Gulf of Mexico - (Peer Reviewed Journal) - (03-Apr-13)
A soil quality and metabolic activity assessment after fifty-seven years of agricultural management - (Peer Reviewed Journal)
Stott, D.E., Karlen, D.L., Cambardella, C.A., Harmel, R.D. 2013. A soil quality and metabolic activity assessment after fifty-seven years of agricultural management. Soil Science Society of America Journal. 77(3):903-913.
Impact of poultry litter application and land use on E. coli runoff from small agricultural watersheds - (Peer Reviewed Journal)
Harmel, R.D., Wagner, K.L., Martin, E., Gentry, T., Karthikeyan, R., Dozier, M., Coufal, C. 2013. Impact of poultry litter application and land use on E. coli runoff from small agricultural watersheds. Biological Engineering Transactions (ASABE). 6(1):3-16.
Assessment of cattle grazing effects on E. coli runoff - (Peer Reviewed Journal)
Wagner, K.L., Redmon, L.A., Gentry, T.J., Harmel, R.D. 2012. Assessment of cattle grazing effects on E. coli runoff. Transactions of the ASABE. 55(6):2111-2122.
Shrink-swell behavior of soil across a vertisol catena - (Peer Reviewed Journal)
Dinka, T., Morgan, C., McInnes, K., Kishne, A., Harmel, R.D. 2013. Shrink-swell behavior of soil across a Vertisol catena. Journal of Hydrology. 476:352-359.
Swat Check: a Screening Tool to Assist Users in the Identification of Potential Model Application Problems - (Peer Reviewed Journal)
White, M.J., Harmel, R.D., Arnold, J.G., Williams, J.R. 2012. SWAT Check: A screening tool to assist users in the identification of potential model application problems. Journal of Environmental Quality. doi:10.2134/jeq2012.0039.
Soil organic C:N vs. water-extractable organic C:N Reprint Icon - (Peer Reviewed Journal)
Haney, R.L., Franzluebbers, A.J., Jin, V.L., Johnson, M.V., Haney, E.B., White, M.J., Harmel, R.D. 2012. Soil organic C:N vs. water-extractable organic C:N. Open Journal of Soil Science. 2(3):269-274.
Swat: Model Use, Calibration, and Validation - (Peer Reviewed Journal)
Arnold, J.G., Moriasi, D.N., Gassman, P.W., Abbaspour, K.C., White, M.J., Srinivasan, R., Santhi, C., Harmel, R.D., Van Griensven, A., Van Liew, M.W., Kannan, N., Jha, M.K. 2012. SWAT: Model use, calibration, and validation. Transactions of the ASABE. 55(4):1491-1508.
Development and Validation of the Texas Best Management Practice Evaluation Tool (TBET) - (Peer Reviewed Journal)
White, M.J., Harmel, R.D., Haney, R.L. 2012. Development and Validation of the Texas Best Management Practice Evaluation Tool (TBET). Journal of Soil and Water Conservation. 67(6):525-535.
Development of sub-daily erosion and sediment transport algorithms in SWAT - (Peer Reviewed Journal)
Jeong, J., Kannan, N., Arnold, J.G., Glick, R., Gosselink, L., Srinivasan, R., Harmel, R.D. 2011. Development of sub-daily erosion and sediment transport algorithms in SWAT. Transactions of the ASABE. 54(5):1685-1691.
Upland contribution of sediment and runoff during extreme drought: A study of the 1947-1956 drought in the Blackland Prairie, Texas - (Peer Reviewed Journal)
Allen, P.M., Harmel, R.D., Dunbar, J.A., Arnold, J.G. 2011. Upland contribution of sediment and runoff during extreme drought: A study of the 1947-1956 drought in the Blackland Prairie, Texas. Journal of Hydrology. 407(1-4):1-11.
Effects of annual turkey litter application on surface soil quality of a Texas Blackland vertisol - (Peer Reviewed Journal)
Harmel, R.D., Haney, R.L., Smith, D.R. 2011. Effects of annual turkey litter application on surface soil quality of a Texas Blackland vertisol. Soil Science. 176(5):227-236.
Clash of the Titans: Comparing productivity via radiation use efficiency for two grass giants of the biofuel field - (Peer Reviewed Journal)
Kiniry, J.R., Johnson, M., Bruckerhoff, S.B., Kaiser, J.U., Cordsiemon, R.L., Harmel, R.D. 2012. Clash of the Titans: Comparing productivity via radiation use efficiency for two grass giants of the biofuel field. BioEnergy Research. 5(1):41-48.
Monitoring strategies and scale-appropriate hydrologic and biogeochemical modelling for natural resource management: Conclusions and recommendations from a session held at the iEMSs 2008 - (Peer Reviewed Journal)
Bende-Michl, U., Volk, M., Harmel, R.D., Newham, L., Dalgaard, T. 2011. Monitoring strategies and scale-appropriate hydrologic and biogeochemical modelling for natural resource management: Conclusions and recommendations from a session held at the iEMSs 2008. Journal of Environmental Modeling and Software. 26:538-542.
Effects of agricultural management, land use, and watershed scale on E. coli concentrations in runoff and streamflow - (Peer Reviewed Journal)
Harmel, R.D., Karthikeyan, R., Gentry, T., Srinivasan, R. 2010. Effects of agricultural management, land use, and watershed scale on E. coli concentrations in runoff and streamflow. Transactions of the ASABE. 53(6):1833-1841.
Chapter 12: Uncertainty in measured water quality data - (Book / Chapter)
Harmel, R.D., Smith, P., Migliaccio, K. 2010. Chapter 12: Uncertainty in measured water quality data. In: Li, Y., Migliaccio, K., editors. Water Quality Concepts, Sampling, and Analyses. CRC Press. p. 227-239.
Chapter 5: Surface water quality sampling in streams and canals - (Book / Chapter)
Migliaccio, K., Harmel, R.D., Smiley, P.C. 2010. Chapter 5: Surface water quality sampling in streams and canals. In: Li, Y., Migliaccio, K., editors. Water Quality Concepts, Sampling, and Analyses. CRC Press. p. 51-72.
Impact of sampling techniques on measured stormwater quality data for small streams - (Peer Reviewed Journal)
Harmel, R.D., Slade, R.M., Haney, R.L. 2010. Impact of sampling techniques on measured stormwater quality data for small streams. Journal of Environmental Quality. 39(5):1734-1742.
The Riesel Watershed: A star attraction on the experimental watershed network map - (Peer Reviewed Journal)
Harmel, R.D., Arnold, J.G. 2010. The Riesel Watershed: A star attraction on the experimental watershed network map. Resource Engineering and Technology for a Sustainable World. 17(4):16-18.
Modifying goodness-of-fit indicators to incorporate both measurement and model uncertainty in model calibration and validation - (Peer Reviewed Journal)
Harmel, R.D., Smith, P.K., Migliaccio, K.W. 2010. Modifying goodness-of-fit indicators to incorporate both measurement and model uncertainty in model calibration and validation. Transactions of the ASABE. 53(1):55-63.
On-farm agro-economic effects of fertilizing cropland with poultry litter - (Research Technical Update)
Harmel, R.D. 2009. On-farm agro-economic effects of fertilizing cropland with poultry litter. Natural Resources Research Update (NRRU). Update #241547)
Measurement errors in tipping bucket rain gauges under different rainfall intensities and their implication to hydrologic models Reprint Icon - (Proceedings)
Shedekar, V., King, K.W., Brown, L., Fausey, N.R., Heckel, M., Harmel, R.D. 2009. Measurement errors in tipping bucket rain gauges under different rainfall intensities and their implication to hydrologic models. ASABE Annual International Meeting, June 21-24, 2009, Reno, Nevada. Paper #97368.
Nitrogen and Phosphorus Runoff from Cropland and Pasture Fields Fertilized with Poultry Litter Reprint Icon - (Peer Reviewed Journal)
Harmel, R.D., Smith, D.R., Haney, R.L., Dozier, M.C. 2009. Nitrogen and Phosphorus Runoff from Cropland and Pasture Fields Fertilized with Poultry Litter. Journal of Soil and Water Conservation. 64(6):400-412.
Estimating Storm Discharge and Water Quality Data Uncertainty: A Software Tool for Monitoring and Modeling Applications - (Peer Reviewed Journal)
Harmel, R.D., Smith, D.R., King, K.W., Slade, R.M. 2009. Estimating Storm Discharge and Water Quality Data Uncertainty: A Software Tool for Monitoring and Modeling Applications. Journal of Environmental Modelling and Software. 24(7):832-842.
On-farm agro-economic effects of fertilizing cropland with poultry litter - (Peer Reviewed Journal)
Harmel, R.D., Harmel, B., Patterson, M.C. 2008. On-farm agro-economic effects of fertilizing cropland with poultry litter. Journal of Applied Poultry Research. 17(4):545-555.
Evaluation of a watershed model for estimating daily flow using limited flow measurements - (Peer Reviewed Journal)
Du, B., Ji, X., Harmel, R.D., Hauck, L.M. 2009. Evaluation of a watershed model for estimating daily flow using limited flow measurements. Journal of the American Water Resources Association. 45(2):475-484.
Evaluation of WEPP for runoff and sediment yield prediction on natural gas well sites - (Peer Reviewed Journal)
Wachal, D.J., Harmel, R.D., Banks, K.E., Hudak, P.F. 2008. Evaluation of WEPP for runoff and sediment yield prediction on natural gas well sites. Transactions of the ASABE. 51(6):1977-1986.
A multilevel model of the impact of farm-level best management practices on phosphorus runoff - (Peer Reviewed Journal)
Reckhow, K.S., Qian, S.S., Harmel, R.D. 2009. A multilevel model of the impact of farm-level best management practices on phosphorus runoff. Journal of the American Water Resources Association. 45(2):369-377.
Conservation Effects Assessment Project research in the Leon River and Riesel watersheds - (Peer Reviewed Journal)
Harmel, R.D., Rossi, C.G., Dybala, T., Arnold, J.G., Potter, K.N., Wolfe, J., Hoffman, D. 2008. Conservation Effects Assessment Project research in the Leon River and Riesel watersheds. Journal of Soil and Water Conservation. 63(6):453-460.
The MANAGE database: Nutrient load and site characteristic updates and runoff concentration data - (Peer Reviewed Journal)
Harmel, R.D., Qian, S., Reckhow, K., Casebolt, P. 2008. The MANAGE database: Nutrient load and site characteristic updates and runoff concentration data. Journal of Environmental Quality. 37(6):2403-2406.
Modeling erosion and sediment control practices in RUSLE 2.0: A management approach for natural gas well sites in Denton County, TX, USA - (Peer Reviewed Journal)
Wachal, D.J., Banks, K.E., Hudak, P.F., Harmel, R.D. 2009. Modeling erosion and sediment control practices in RUSLE 2.0: A management approach for natural gas well sites in Denton County, TX, USA. Environmental Geology. 56(8):1615-1627.
Predicting Management Effects on Phosphorus Loss from Farming Systems - (Peer Reviewed Journal)
Sedorovich, D.M., Rotz, C.A., Vadas, P.A., Harmel, R.D. 2007. Predicting management effects on phosphorus loss from farming systems. Transactions of the American Society of Agricultural Engineers. 50(4):1443-1453.
Evaluation of regression methodology with low-frequency water quality sampling to estimate constituent loads for ephemeral watersheds in Texas - (Peer Reviewed Journal)
Toor, G.S., Harmel, R.D., Haggard, B.E., Schmidt, G. 2008. Evaluation of regression methodology with low-frequency water quality sampling to estimate constituent loads for ephemeral watersheds in Texas. Journal of Environmental Quality. 37(5):1847-1854.
The original USDA-ARS experimental watersheds in Texas and Ohio: contributions from the past and visions for the future - (Peer Reviewed Journal)
Harmel, R.D., Bonta, J.V., Richardson, C.W. 2007. The original USDA-ARS experimental watersheds in Texas and Ohio: Contributions from the past and visions for the future. Transactions of the American Society of Agricultural and Biological Engineers. 50(5):1669-1675.
Soil and Water Assessment Tool Hydrologic and Water Quality Evaluation of Poultry Litter Application to Small-Scale Subwatersheds in Texas - (Peer Reviewed Journal)
Green, C.H., Arnold, J.G., Williams, J.R., Haney, R.L., Harmel, R.D. 2007. Soil and Water Assessment Tool hydrologic and water quality evaluation of poultry litter application to small-scale subwatersheds in Texas. Transactions of the ASABE. 50(4):1199-1209.
Model evaluation guidelines for systematic quantification of accuracy in watershed simulations - (Peer Reviewed Journal)
Moriasi, D.N., Arnold, J.G., Van Liew, M.W., Bingner, R.L., Harmel, R.D., Veith, T.L. 2007. Model evaluation guidelines for systematic quantification of accuracy in watershed simulations. Transactions of the ASABE. 50(3):885-900.
Weed suppression potential of dry applied mulches used in bedding plant applications: Processed cotton gin byproducts versus conventional wood - (Peer Reviewed Journal)
Holt, G.A., Buser, M.D., Harmel, R.D., Potter, K.N., Pelletier, M.G., Duke, S.E. 2007. Weed suppression potential of dry applied mulches used in bedding plant applications: Processed cotton gin byproducts versus conventional wood. Journal of Cotton Science. 11:52-59.
Nutrient Load Generated by Storm Event Runoff from a Golf Course Watershed Reprint Icon - (Peer Reviewed Journal)
King, K.W., Balogh, J.C., Hughes, K., Harmel, R.D. 2007. Nutrient Load Generated by Storm Event Runoff from a Golf Course Watershed. Journal of Environmental Quality. 36:1021-1030.
Consideration of measurement uncertainty in the evaluation of goodness-of-fit in hydrologic and water quality modeling - (Peer Reviewed Journal)
Harmel, R.D., Smith, P.K. 2007. Consideration of measurement uncertainty in the evaluation of goodness-of-fit in hydrologic and water quality modeling. Journal of Hydrology. 337:326-336.
Nutrient Flux in Storm Water Runoff and Baseflow from Managed Turf Reprint Icon - (Peer Reviewed Journal)
King, K.W., Balogh, J., Harmel, R.D. 2007. Nutrient Flux in Storm Water Runoff and Baseflow from Managed Turf. Environmental Pollution. 150:321-328.
Transformations of Soil and Manure Phosphorus after Surface Application of Manure to Field Plots - (Peer Reviewed Journal)
Vadas, P.A., Harmel, R.D., Kleinman, P.J. 2007. Transformations of soil and manure phosphorus after surface application of manure to field plots. Nutrient Cycling in Agroecosystems. 77:83-99.
A Model for Phosphorus Transformation and Runoff Loss for Surface-Applied Manures - (Peer Reviewed Journal)
Vadas, P.A., Gburek, W., Sharpley, A.N., Kleinman, P.J., Moore Jr, P.A., Cabrera, M.L., Harmel, R.D. 2007. A model for phosphorus transformation and runoff loss for surface-applied manures. Journal of Environmental Quality. 36:324-332.
Uncertainty in Tmdl Models - (Peer Reviewed Journal)
Shirmohammadi, A., Chaubey, I., Harmel, R.D., Bosch, D.D., Munoz-Carpena, R., Dharmasri, C., Sexton, A., Arabi, M., Wolfe, M.L., Frankenberger, J., Graff, C.D., Sohrabi, T.M. 2006. Uncertainty in TMDL Models. Transactions of the American Society of Agricultural and Biological Engineers. 49(4):1033-1049 (2006).
Uncertainty in Tmdl Models - (Proceedings)
Shirmohammadi, A., Chaubey, I., Harmel, R.D., Bosch, D.D., Munoz-Carpena, R., Dharmasri, C., Sexton, A., Arabi, M., Wolfe, M., Frankenberger, J., Graff, C.D., Sohrabi, T. 2006. Uncertainty in TMDL models. In: Proceedings of the American Society of Agricultural and Biological Engineers International (ASABE) July 9-12, 2006, Portland, OR.
Microbial Communities and Enzymatic Activities as Affected by Various Poultry Litter Application Rates to Pasture and Cultivated Soils of the Texas Blackland Prairies Ecosystem - (Abstract Only)
Acosta Martinez, V., Harmel, R.D. 2006. Microbial Communities and Enzymatic Activities as Affected by Various Poultry Litter Application Rates to Pasture and Cultivated Soils of the Texas Blackland Prairies Ecosystem. World Congress of Soil Science. Philadelphia, PA. July 9-15, 2006.
Practical guidance for discharge and water quality data collection on small watersheds - (Peer Reviewed Journal)
Harmel, R.D., King, K.W., Haggard, B.E., Wren, D.G., Sheridan, J.M. 2006. Practical guidance for discharge and water quality data collection on small watersheds. Transactions of the ASABE. 49(4):937-948.
Runoff and Soil Loss Relationships for the Texas Blackland Prairies Ecoregion - (Peer Reviewed Journal)
Harmel, R.D., Richardson, C.W., King, K.W., Allen, P.M. 2006. Runoff and soil loss relationships for the Texas Blackland Prairies ecoregion. Journal of Hydrology. 331(3-4):471-483.
Soil Microbial Communities and Enzyme Activities under Various Poultry Litter Application Rates - (Peer Reviewed Journal)
Acosta Martinez, V., Harmel, R.D. 2006. Soil microbial communities and enzyme activities under various poultry litter application rates. Journal of Environmental Quality. 35(4):1309-1318.
Cumulative Uncertainty in Measured Streamflow and Water Quality Data for Small Watersheds - (Peer Reviewed Journal)
Harmel, R.D., Cooper, R.J., Slade, R.M., Haney, R.L., Arnold, J.G. 2006. Cumulative uncertainty in measured streamflow and water quality data for small watersheds. Transactions of the ASABE. 49(3):689-701.
Impacts of Various Poultry Litter Application Rates on Microbial Communities and Enzyme Activities in Pasture and Cultivated Soils of the Texas Blackland Prairies Ecosystem - (Abstract Only)
Acosta Martinez, V., Harmel, R.D. 2006. Impacts of various poultry litter application rates on microbial communities and enzyme activities in pasture and cultivated soils of the texas blackland prairies ecosystem. International Symposium on Soil Erosion and Dryland Farming, October 1-5, 2006, Yanling, Shaanxi, China. CD-ROM
Evaluation of Epic for Assessing Crop Yield, Runoff, Sediment and Nutrient Losses from Watersheds with Poultry Litter Fertilization - (Peer Reviewed Journal)
Wang, X., Harmel, R.D., Williams, J.R., Harman, W.L. 2006. Evaluation of EPIC for assessing crop yield, runoff, sediment and nutrient losses from watersheds with poultry litter fertilization. Transactions of the ASABE. 49(1):47-59.
Compilation of measured nutrient load data for agricultural land uses in the United States - (Peer Reviewed Journal)
Harmel, R.D., Potter, S., Casebolt, P., Reckhow, K., Green, C.H., Haney, R.L. 2006. Compilation of measured nutrient load data for agricultural land uses in the United States. Journal of the American Water Resources Association. 42(5):1163-1178.
Comparison of Cotton-Based Hydro-Mulches to Conventional Wood and Paper Hydro-Mulches-Study II - (Peer Reviewed Journal)
Holt, G., Buser, M., Harmel, D., Potter, K. 2005. Comparison of cotton-based hydro-mulches and conventional wood and paper hydro-mulches--Study II. The Journal of Cotton Science. 9:128-134.
No3-N & Dissolved Reactive Phosporus in Subsurface Drainage from Managed Turfgrass. - (Peer Reviewed Journal)
King, K.W., Hughes, K.L., Balogh, J.C., Fausey, N.R., Harmel, R.D. 2006. Nitrate-nitrogen & dissolved reactive phosporus in subsurface drainage from managed turfgrass. Journal of Soil and Water Conservation. 61(1):31-40.
Uncertainty in Measured Sediment and Nutrient Flux in Runoff from Small Agricultural Watersheds - (Peer Reviewed Journal)
Harmel, R.D., King, K.W. 2005. Uncertainty in measured sediment and nutrient flux in runoff from small agricultural watersheds. Transactions of the ASAE. 48(5):1713-1721.
Development and Sensitivity of a Method to Select Time and Flow-Paced Storm Event Sampling Intervals - (Peer Reviewed Journal)
King, K.W., Harmel, R.D., Fausey, N.R. 2005. Development and sensitivity of a method to select time- and flow-paced storm event sampling intervals. Journal of Soil and Water Conservation. 60(6):323-331.
Comparison of Cotton-Based Hydro-Mulches Versus Conventional Wood and Paper Hydro-Mulches - Study 1 - (Peer Reviewed Journal)
Holt, G., Buser, M., Harmel, D., Potter, K., Pelletier, M.. 2005. Comparison of cotton-based hydro-mulches and conventional wood and paper hydro-mulches--Study 1. The Journal of Cotton Science. 9:121-127.
Impact of Soil Amendments on Reducing P Losses from Runoff in Sod - (Peer Reviewed Journal)
Torbert III, H.A., King, K.W., Harmel, R.D. 2005. Impact of soil amendments on reducing p losses from runoff in sod. Journal of Environmental Quality. 34:1415-1421.
Evaluation of Processed Gin Waste for Use As a Hydro-Mulch - (Proceedings)
Holt, G.A., Buser, M., Harmel, R.D., Potter, K. and Lee, E. 2005. Evaluation of processed gin waste for use as a hydromulch. In: Proceedings of the Beltwide Cotton Conferences, January 4-7, 2005, New Orleans, Louisiana. p. 2991-3000. 2005 CDROM.
Potential of Some Soil Amendments on Reducing Soluble P Losses from Manure - (Abstract Only)
Torbert III, H.A., King, K.W., Harmel, R.D. 2004. Potential of some soil amendments on reducing soluble p losses from manure. [abstract] American Society of Agronomy Meetings. 2004 CDROM
Field Evaluation of Three Phosphorus Indices on New Application Sites in Texas - (Peer Reviewed Journal)
Harmel, R.D., Torbert III, H.A., Delaune, P.B., Haggard, B.E., Haney, R.L. 2005. Field evaluation of three phosphorus indices on new application sites in Texas. Journal of Soil and Water Conservation Society. 60(1):29-42.
Evaluation of Some Phosphorus Index Criteria in Cultivated Agriculture in Clay Soils - (Peer Reviewed Journal)
Torbert III, H.A., Harmel, R.D., Potter, K.N., Dozier, M. 2005. Evaluation of some phosphorus index criteria in cultivated agriculture in clay soils. Journal of Soil and Water Conservation. 60(1):21-29.
Comparison of Time-Based Sampling Strategies to Determine Nitrogen Loading in Plot Scale Runoff - (Peer Reviewed Journal)
King, K.W., Harmel, R.D. 2004. Comparison of Time-Based Sampling Strategies to Determine Nitrogen Loading in Plot Scale Runoff. Transactions of the ASAE. 47(5):1457-1463.
Discharge and Sedimentation Periodicities in Small Sized Watersheds - (Peer Reviewed Journal)
Muttiah, R.S., Harmel, R.D., Richardson, C.W. 2005. Discharge and sedimentation periodicities in small sized watersheds. Catena. 61(2-3):241-255.
Field Data and Flow System Response in Clay (Vertisol) Shale Terrain, North Central Texas, Usa - (Peer Reviewed Journal)
Allen, P.M., Harmel, R.D., Arnold, J.G., Plant, B., Yelderman, J., King, K.W. 2005. Field data and flow system response in clay (vertisol) shale terrain, north central Texas, USA. Hydrological Processes. 19(14):2719-2736.
Water Quality Impacts of Converting to a Poultry Litter Fertilization Strategy - (Peer Reviewed Journal)
Harmel, R.D., Torbert, H.A., Haggard, B.E., Haney, R., Dozier, M. 2004. Water quality impacts of converting to a poultry litter fertilization strategy. Journal of Environmental Quality. 33(6):2229-2242.
The Coby Process: Bedding Mulch Study Results - (Proceedings)
Holt, G.A., Buser, M.D., Pelletier, M.G., Harmel, R.D., Potter, K.N., Lee, E. 2004. The COBY Process: Bedding mulch study results. In: Proceedings of the Beltwide Cotton Conference, January 7-10, 2004, San Antonio, TX. 2004 CD-ROM. p. 986-993.
The Coby Process: Erosion Control Study Results - (Proceedings)
Holt, G.A., Buser, M.D., Pelletier, M.G., Harmel, R.D., Potter, K.N., Lee, E. 2004. The COBY process: erosion control study results. In: Proceedings of Beltwide Cotton Conference, January 7-10, 2004, San Antonio, TX. 2004 CD-ROM. p. 994-1000.
Evaluation of Some P Index Criteria in Cultivated Agriculture with Rainfall Simulation - (Abstract Only)
Torbert III, H.A., R.D. Harmel, and K.N. Potter. 2004. Evaluation of some P Index Criteria in Cultivated Agriculture with Rainfall Simulation. Sustainable Land Application Conference Lake Buena Vista, FL. January 4-8, 2004.
Hydrologic Instrumentation at the USDA-ARS Grassland, Soil and Water Research Laboratory, Riesel, TX - (Proceedings)
Harmel, R.D., Richardson, C.W., King, K.W., Arnold, J.G. 2003. Hydrologic instrumentation at the USDA-ARS Grassland, Soil and Water Research Laboratory, Riesel, TX. Proceedings of First Interagency Conference on Research in the Watersheds. p. 56-61.
Analysis of Long-Term Precipitation for the Central Texas Blackland Prairie: 1939-1999 - (Proceedings)
Harmel, R.D., King, K.W., Richardson, C.W., Williams, J.R., Arnold, J.G. 2003. Analysis of long-term precipitation for the Central Texas Blackland Prairie: 1939-1999. Proceedings of First Interagency Conference on Research in the Watersheds. p. 480-485.
Multi-watershed evaluation of WSR-88D (NEXRAD) radar-precipitation products for hydrologic and natural resources modeling applications - (Abstract Only)
Hardegree, S.P., Van Vactor, S.S., Healy, K.R., Alonso, C.V., Bonta, J.V., Bosch, D.D., Fisher, D.S., Goodrich, D.C., Harmel, R.D., Steiner, J.L., Van Liew, M.W., 2003, Multi-watershed evaluation of WSR-88D (NEXRAD) radar-precipitation products for hydrologic and natural resources modeling applications. In: American Geophysical Union. 84(46):H22D-0962.
Rainfall Simulation Evaluation of Some P Index Criteria - (Abstract Only)
Torbert III, H.A., R.D. Harmel, and K.N. Potter. 2003. Rainfall Simulation Evaluation of some P Index Criteria. 17th Annual Alabama Water Resources Conference, Orange Beach, AL, September 3-5, 2003.
Long-Term Precipitation Analyses for the Central Texas Blackland Prairie - (Peer Reviewed Journal)
Harmel, R.D., King, K.W., Richardson, C.W., Williams, J.R. 2003. Long-term precipitation analyses for the Central Texas Blackland Prairie. Transactions of the American Society of Agricultural Engineers. 46(5):1381-1388.
Multi-watershed evaluation of WSR-88D (NEXRAD) radar-precipitation products - (Proceedings)
Hardegree, S.P., Van Vactor, S.S., Healy, K.R., Alonso, C.V., Bonta, J.V., Bosch, D.D., Fisher, D.S., Goodrich, D.C., Harmel, R.D., Steiner, J.L., Van Liew, M.W., 2003. Multi-watershed evaluation of WSR-88D (NEXRAD) radar-precipitation products. In: Proceedings of the First Interagency Conference on Research in the Watersheds, October 28-30, 2003, Benson, Arizona, p. 486-491.
Comparison of True Loads to Various Time-Based Sampling - (Proceedings)
KING, K.W., HARMEL, R.D., ZWIERSCHKE, E.L. COMPARISON OF TRUE LOADS TO VARIOUS TIME-BASED SAMPLING. 2003. AMERICAN SOCIETY FOR AGRICULTURAL ENGINEERING. PAPER NO. 03 2178.
Automated Storm Water Sampling on Small Waterhseds - (Peer Reviewed Journal)
Harmel, R.D., King, K.W., Slade, R.M. 2003. Automated storm water sampling on small watersheds. Applied Engineering in Agriculture. 19(6):667-674.
Runoff Water Quality Impact of Variable Rate Sidedress Nitrogen Application - (Peer Reviewed Journal)
Harmel, R.D., Kenimer, A.L., Searcy, S.W., Torbert, H.A. 2004. Runoff water quality impact of variable rate sidedress nitrogen application. Precision Agriculture. 5(3):247-261.
Considerations in Selecting a Water Quality Sampling Strategy - (Peer Reviewed Journal)
KING, K.W., HARMEL, R.D. CONSIDERATIONS IN SELECTING A WATER QUALITY SAMPLING STRATEGY. TRANSACTIONS OF THE AMERICAN SOCIETY OF AGRICULTURAL ENGINEERS. 2003. v. 46(1). p. 63-73.
Developing Automated Storm Water Sampling Strategies for Small Watersheds - (Proceedings)
Harmel, R.D., King, K.W., Hauck, L. Developing automated storm water sampling strategies for small watersheds. Proceedings of the Texas Water Monitoring Congress. 2002. Available from: http://www.txwmc.org/2002_Congress/2002%20Plenary%20Session.htm
Initial Evaluation of a Phosphorus Index on Pasture and Cropland Watersheds in Texas - (Proceedings)
Harmel, R.D., DeLaune, P.B., Haggard, B.E., King, K.W., Richardson, C.W., Moore Jr., P.A., Torbert, H.A. Initial evaluation of a phosphorus index on pasture and cropland watersheds in Texas. American Society of Agricultural Engineers. 2002. Paper No. 02-2075.
The Gem Experience: Weather Generator Technology Development in the USDA - (Peer Reviewed Journal)
Harmel, R.D., Johnson, G., Richardson, C.W. 2002. The gem experience: weather generator technology development in the usda. Bulletin of the American Meterological Society. 83(7):954-957.
Minimum Flow Considerations for Automated Storm Sampling on Small Watersheds - (Peer Reviewed Journal)
Harmel, R.D., King, K.W., Wolfe, J.E., Torbert, H.A. Minimum flow considerations for automated storm sampling on small watersheds. Texas Journal of Science. 2002. v. 54(2). p. 177-188.
Evaluating the Adequacy of Simulating Maximum and Minimum Daily Air Temperature with the Normal Distribution - (Peer Reviewed Journal) - (26-Jan-02)
Evaluating the Adequacy of Simulating Maximum and Minimum Daily Air Temperature with the Normal Distribution - (Proceedings) - (20-Jan-02)
Weather Generator Research and Development - (Abstract Only) - (26-Nov-01)
Efecto Del Manejo DE Precision En La Productividad DE Maiz En Los Suelos DE Pradera DE Texas (Precision Farming Effecs on Corn Productivity in the Blackland Prairie of Texas) - (Book / Chapter)
Torbert, H.A., Searcy, S.W., Kenimer, A.L., Harmel, R.D. Efecto del manejo de precision en la productividad de maiz en los suelos de pradera de Texas. Claveran A., Rulfo V., R. y F. O., editors. Productividad y conservacion: Agua y Suelo: Avances de investigacion en agriculture de conservacion II. Morelia Mich., Mexico. SAGARPA. INIFAP. CENAPROS. p. 263-271.
Impact of a Turfgrass System on Nutrient Loadings to Surface Water - (Peer Reviewed Journal)
King, K.W., Harmel, R.D., Torbert, H.A., Balogh, J.C. Impact of a turfgrass system on nutrient loading to surface water. Journal of the American Water Resources Association. 2001. v. 37(3). p. 629-640.
Design and Evaluation of An Automated System for Acquisition of Velocity Data in Small Channels - (Peer Reviewed Journal) - (01-Sep-00)
Hydrologic Response of a Small Watershed Model to Generated Precipitation - (Peer Reviewed Journal)
Harmel, R.D., Richardson, C.W., King, K.W. 2000. Hydrologic response of a small watershed model to generated precipitation. Transactions of the ASAE. 43(6):1483-1488.
Nitrogen Losses from Corn Receiving Conventional and Precision-Applied Fertilizer - (Proceedings)
Kenimer, A.L., Harmel, D., Torbert, H.A., Akbar, M.A., Searcy, S.A. Nitrogen losses from corn receiving conventional and precision-applied fertilizer. Proceedings of American Society of Agronomy. 2000. Paper No. 002073.
Feeding Turf with Wastewater - (Peer Reviewed Journal) - (20-Jan-00)
Initial Application of Swat to Turfgrass Systems - (Proceedings)
King, K.W., Balogh, J.C., Harmel, R.D, Torbert, H.A, Arnold, J.G. Initial application of SWAT to turfgrass systems. Proceedings of the American Society of Agricultural Engineers. 1999. Paper No. 99-2241.
Last Modified: 12/10/2013
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