OTHA - Omaha Tools for Hydrologic Analysis - Time-Series/Statistical Analysis Programs for Water Resources

A suite of programs has been developed by the Omaha District to provide useful tools to aid in the rapid and accurate analysis of hydrologic daily flow time-series data and peak flow data for various water resources/environmental projects. These programs utilize tools not currently found in existing software and all the OTHA programs have: easy-to-use Visual Basic GUI interfaces, FORTRAN engines, connections to WEB data locations, data conversion utilities, and utilize standard data formats: HEC-DSS databases for daily flows and HEC-FFA input formats for instantaneous peak flows. Various water resources related routines within OTHA include: time-series cross-correlation analysis, trend analysis, volume-frequency/balanced-hydrograph generation, extension of records, synthetic daily flow and peak flow generation, mix-population analysis, total probability theorem analysis, risk/binomial distribution analysis, precipitation-frequency analysis using General Extreme Value 1 distribution, and tests and corrects for stationarity or linear trends of statistical parameters. Model Development. The programs contained in OTHA are predominantly software that had been previously developed by the Omaha District Corps of Engineers in the course of analyzing various water resources projects. The primary purpose of OTHA was to compile all the existing programs into one easy-to-use package and to be able to use these programs in conjunction with traditional statistical analysis software such as HEC-FFA and HEC-STATS. Specific model goals include: