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Proceedings Workshop ManagementInApplicationsComputerOn Water May 23-25, 1995 Fort Collins. Colorado Sponsored by: Great Plains Agricultural Council USDA,NCRS and ARS Colorado State University Department of Soil and Crop Sciences and W ater Resources Research Institute University of Wyoming, i Cooperative Extension Service and Water Resources Center University of Nebraska. Water Resources Center COLORADO WATER RESOURCES RESEARCH INSTITUTE GPAC Publication No. 154 Information Series No. 7'9 WORKSHOP ON COMPUTER APPLICATIONS IN WATER MANAGEMENT Proceedings of the 1995 Workshop May 23-25, 1995 Colorado State University Fort Collins, CO Compiled and edited by: L. Ahuja, J. Leppert, K. Rojas USDA-ARS, Fort Collins, CO E. Seely USDA-NRCS, Fort Collins, CO Published by: Great Plains Agricultural Council Water Resources Research Institute Colorado State University Colorado State University Fort Collins, CO 80523 Fort Collins, CO 80523 GPAC Publication No. 154 Information Series No. 79 PREFACE The Great Plains Agricultural Council (GPAC) is an organization made up of the Land Grant Universities in the Great Plains States and the GPAC member USDA Agencies. The GPAC provides information on problems and issues relating to agriculture, resource use, and rural development in the Great Plains region. Responding to a 1992 recommendation from its Water Committee, the GPAC Executive Committee approved the formation of a Task Force on Computer Applications in Water Management For this Task Force, we are pleased to have the participation of the Bureau of Reclamation, USDI as well. The Task Force was organized in the spring of 1993 to plan and conduct a workshop which would provide a forum for model developers and users to discuss successes and failures of computer-based tools in water management. The Executive Committee charged the task force to: • Identify specific needs of water quantity and quality managers that can most appropriately be met with computer simulation models. • Identify specific computer simulation models or other appropriate methodologies which are actually used or have the immediate potential for use by water managers. • Develop a subject matter scope for the workshop. • Identify groups of computer simulation model developers and users, especially within state agencies, who would benefit from the workshop. • Identify potential members and provide guidance for program and editorial committees to be charged with siting, program development and conduct of the workshop, and production of the proceedings. At the initial meeting of the Task Force, it became apparent that computer-based data and information systems must be an integral part of the workshop. These systems were added to the subjects to be addressed by the workshop. At the second meeting of the Task Force, the purpose of the Workshop was formulated as: The purpose of the Workshop is to familiarize State and Local mid-level water resource managers in the Great Plains with computer models, information exchange networks, and computer-assisted automation technology, available for the analysis and solution of complex water quantity and water quality issues. While examples will relate to Great Plains water management issues, the Workshop will also be of interest to water managers from other regions. The focus will be on illustrating the use and limitations of a variety of computer models related to water quantity and quality management by way of four or five test cases. The Workshop will bring together model developers and potential users in state and local applications to exchange user needs and potential methods of issue resolution. iii COLORADO STATE UNIVERSITY LIBRARIES The Workshop has been organized around applications of: — Information Technology — River Basin Scale Models ~ Watershed Scale Models ~ Field Scale Models and supported by: ~ A General Session — Poster and Computer Demonstrations — Commercial Exhibits On behalf of the Great Plains Agricultural Council and the Task Force organizing the Workshop, we hope you find the proceedings of this Workshop to be useful in your efforts to serve the people involved with water management. Lajpat R. Ahuja USDA-ARS Task Force Chair Duane L. Johnson USDA-NRCS Task Force Administrative Advisor Melvin D. Skold Colorado State University GPAC Executive Director iv CONFERENCE ORGANIZING COMMITTEE The members of the Task Force and their responsibilities for organizing this Workshop are: Laj Ahuja USDA-ARS, Fort Collins, CO Task Force Chair Gordon Aycock USDI-BOR, Billings, MT Member, Program Committee Grant Cardon Colorado State Univ., Fort Collins, CO Chair, Local Arrangements Committee Dennis Child USDA-ARS, Beltsville, MD Chair, Funding Committee Donn DeCoursey USDA-ARS, Fort Collins, CO Co-Chair, Resource Fair Committee Eldon Fredericks USDA-ES, Purdue Univ., West Lafayette, IN Chair, Publicity Committee Don Frevert USDI-BOR, Denver, CO Member, Program Committee Don Goss Texas A&M Univ., Temple, TX Member, Proceedings Committee Dale Heermann USDA-ARS, Fort Collins, CO Member, Resource Fair Committee John Hickman Kansas State Univ., Manhattan, KS Former Chair, Task Force Duane Johnson USDA-NRCS, Lakewood, CO Administrative Advisor & Member, Funding Comm. Norman Klocke Univ. of Nebraska, North Platte, NE Chair, Program Committee Scott Needham Univ. of Wyoming, Laramie, WY Former Member, Task Force Dave Nofziger Oklahoma State Univ., Stillwater, OK Member, Program Committee Bernie Owen USDA-NRCS, Fort Collins, CO Member, Program Committee Ken Rojas USDA-ARS, Fort Collins, CO Member, Local Arrangements Committee Ed Seely USDA-NRCS, Fort Collins, CO Co-Chair, Resource Fair Committee Mel Skold Great Plains Agricultural Council, Ft. Collins, CO, Member, Task Force Chuck Troendle USDA-FS, Fort Collins, CO Member, Local Arrangements Committee Barbara Vining USDA-NRCS, Lincoln, NE Member, Task Force Chris Goertler Univ. of Wyoming, Laramie, WY Member, Task Force v TABLE OF CONTENTS Preface iii Conference Organizing Committee v GENERAL SESSION: Model Selection and Use - Increasing the Chances for Success - Developer's Viewpoint D.L. Nofziger 1 Model Selection and Use - Increasing the Chances for Success - A User's Viewpoint B.M. Vining and M.K. Brodahl 6 Models and Decision Making in Uncertain Environments C.T. Haan 11 RESERVOIR AND RIVER SYSTEM WORKSHOP: Reservoir and River System Models G.L. Aycock, E. Eberaert, A. Mackichan, N. Parker, M. Brewer, D. Frevert, and D. King 15 Hydross Simulation Support System M.S. Brewer and W.L. Sharp 20 Decision Support for Water Resources Management in the Colorado River Regions T.J. Fulp, W.B. Vickers, B. Williams, and D.L. King 24 WATERSHED SCALE WORKSHOP: Watershed Scale Workshop Introduction and Overview S. Owen 28 The SECO Creek Water Quality Demonstration Project P.N. Wright 29 AGNPS - Agricultural Nonpoint Source Model R.A. Young and R.G. Shepherd 33 Simulator for Water Resources in Rural Basins-Water Quality J.G. Arnold and C.E. Drungil 39 Hydrologic Unit Water Quality Model GIS Interface to Four ARS Water Quality Models for Use by the Natural Resource Conservation Service W.F. Geter, P. Smith, and C. Drungil 44 vi POSTERS AND COMPUTER DEMONSTRATIONS: Water Management with the Soybean Crop Model GLYCIM B. Acock, V.R. Reddy, Y.A. Pachepsky, A. Trent, and F.D. Whisler 49 GPFARM Decision Support System for Whole Farm/Ranch Management J.C. Ascough D, J.D. Hanson, MJ. Shaffer, G.W. Buchleiter, P.N.S. Bartling, B. Vandenberg, D.A. Edmunds, L.J. Wiles, G.S. McMaster, and L.R. Ahuja 53 The Stream Network Temperature Model (SNTEMP): A Decade of Results J.M. Bartholow 57 Irrigation Scheduling with Climatic Data G.W. Buchleiter, D.F. Heermann, and H.R. Duke 61 Basin-Scale Assessment of a Non-Point Source Pollutant in the Vadose Zone D.L. Corwin, P.J. Vaughan, J.D. Rhoades, and D.G. Cone 66 Agricultural Meteorological Information Systems P. Davidson and M. McVay 70 The Montana Missouri River Model and Its Use in a Basin-Wide Water Allocation Proceeding L.S. Dolan 74 Modeling of Irrigated and Dryland Corn Production Systems in Eastern Colorado H.J. Farahani, L.R. Ahuja, G.A. Peterson, G.W. Buchleiter, and L.A. Sherrod 78 The Water Erosion Prediction Project (WEPP) Models for Use in Natural Resource Management D.C. Flanagan, J.C. Ascough II, M.A. Nearing, J.M. Laflen, and S.J. Livingston 82 Decision Support System for Stream-Aquifer Management in the South Platte River Basin J.W. Fredericks, J.W. Labadie, and J. Altenhoffen 86 Distance Education Through Technology Transfer Using Ku Band Satellite Systems B. Hamblen 93 Simulations of Snow Distribution and Hydrology in a Mountain Basin M.D. Hartman, J.S. Baron, and D.S. Ojima 95 Irrigation Demand Under Climate Change Determined by Regional Simulation J.D. Haskett, Y.A. Pachepsky, and B. Acock 100 Response Surface Methodology as a Means of Reducing the Costs of Biophysical Simulation D.L. Hoag, S.S. Vickner, and W.M. Frasier 105 Use of the SCS-Scheduler Program - Southern High Plains T.A. Howell, K. Johnson, and D.A. Dusek 109 vii Pit-Reservoir Design for Storage of Drifting Snow R.L. Jairell and R.A. Schmidt 114 Using NLEAP to Estimate Cropland Nitrate Leaching Losses in the Central Wisconsin Sand Plain J.D. Kaap, W. Ebert, and M.K. Brodahl 118 Monitoring Software for Pollutant Components in Furrow- Irrigation Runoff R.D. Lentz and R.E. Sojka 123 Models for Estimating Groundwater Contamination Potential From Agricultural Pesticides S. Liu and D. Hoag 128 The Physical Habitat Simulation System: Structure and Logic R.T. Milhous 133 Modeling the Riparian Zone R.T. Milhous and G.T. Auble 137 Watershed Hydrology and Bio geochemistry: Simulation of Streamflow Quantity and Quality by the Century Model W.M. Pulliam and W.J. Parton 141 FARM*A *SYST Decision Support System P.C. Robert and J.L. Anderson 145 Seasonal Transport of Snow by Wind R.A. Schmidt and R.L. Jairell 149 NLEAP Model for Identification and Mitigation of Regional Nitrate Leaching Hot Spots M.J.

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