US Army Corps of Engineers Hydrologic Engineering Center Accuracy of Computed Water Surface Profiles Appendix D Data Management and Processing Procedures February 1987 Approved for Public Release. Distribution Unlimited. RD-26D
REPORT DOCUMENTATION PAGE Form Approved OMB No. 0704-0188 The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to the Department of Defense, Executive Services and Communications Directorate (0704-0188). Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ORGANIZATION. 1. REPORT DATE (DD-MM-YYYY) 2. REPORT TYPE February 1987 Research Document 4. TITLE AND SUBTITLE Accuracy of Computed Water Surface Profiles Appendix D Data Management and Processing Procedures 3. DATES COVERED (From - To) 5a. CONTRACT NUMBER 5b. GRANT NUMBER 5c. PROGRAM ELEMENT NUMBER 6. AUTHOR(S) CEIWR-HEC 5d. PROJECT NUMBER 5e. TASK NUMBER 5F. WORK UNIT NUMBER 7. PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES) US Army Corps of Engineers Institute for Water Resources Hydrologic Engineering Center (HEC) 609 Second Street Davis, CA 95616-4687 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) 8. PERFORMING ORGANIZATION REPORT NUMBER RD-26D 10. SPONSOR/ MONITOR'S ACRONYM(S) 11. SPONSOR/ MONITOR'S REPORT NUMBER(S) 12. DISTRIBUTION / AVAILABILITY STATEMENT Approved for public release; distribution is unlimited. 13. SUPPLEMENTARY NOTES 14. ABSTRACT The purpose of the Water Surface Profile Error Analysis Study is to determine guidelines which indicate the effect that geometric accuracy and boundary friction accuracy have on computed water surface profiles. The study procedures and results are documented in RD-26 and RD-26A. This appendix describes only the data management and processing portion of the study. To analyze the accuracy of computer water surface profiles as a function of several variables, the Monte-Carlo simulation technique was applied. This technique required over 40,000 executions of HEC-2. The input data to and the results from HEC-2 had to be systematically and automatically manipulated and processed. A preprocessor program (SETUP) modified simplified HEC-2 input data to do the following: simulate errors in measuring geometry and in determining roughness coefficients, interpolate intermediate cross-sections, optionally determine topographic crosssections, and automatically submit the manipulated input data as a "batch" computer job. A postprocessor (H2POST) reads HEC-2 computed results, forms a unique data base label to identify each computed profile, and stores the computed profile in a data base file (HECDSS data file) using that label. An error computational program (COMPER) accesses the HECDSS data file, calculates errors in computed water surface elevations between a base "error free" profile and other manipulated data set profile and formats the results (as well as pertinent identifiers) for input to a relational data management system file. The relational data management system (INFO) is used to store computed errors and stream characteristics and write reports containing errors and characteristics that meet user specified criteria. The reports are then used as input to regression software (HEC's Multiple Linear Regression Program or the personal computer software package STATGRAPHICS). This appendix describes the details of data processing, the assumptions that were made, and the software that was developed and applied to meet the study needs. 15. SUBJECT TERMS water surface profile accuracy, Monte-Carlo simulation, data management, manipulated input data, post-processing HEC-2 results, data storage system, relation database 16. SECURITY CLASSIFICATION OF: 17. LIMITATION 18. NUMBER 19a. NAME OF RESPONSIBLE PERSON a. REPORT b. ABSTRACT c. THIS PAGE OF OF ABSTRACT PAGES U U U 19b. TELEPHONE NUMBER UU 126 Standard Form 298 (Rev. 8/98) Prescribed by ANSI Std. Z39-18
Accuracy of Computed Water Surface Profiles Appendix D Data Management and Processing Procedures February 1987 Prepared for: Federal Highway Administration Prepared by: US Army Corps of Engineers Institute for Water Resources Hydrologic Engineering Center 609 Second Street Davis, CA 95616 (530) 756-1104 (530) 756-8250 FAX www.hec.usace.army.mil RD-26D