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<br />Introduction <br /> <br />summalJi{;~)'~~.' <br /> <br />1 Introduction. <br />1.1 Origin of HYDROSS <br />This program was originally developed by the Upper Missouri Region (now the Great Plains <br />Region) of the Bureau of Reclamation in Billings, Montana, in 1977. The initial versions of the <br />program were designed for the Control Data Corporation Cyber computers. The last major release <br />was Version 3 in 1986. The present Version 4, documented by this manual, is a conversion of the <br />Cyber program to the DOS operating system and initially released in January 1991. <br /> <br />1. 2 Pur:pose <br />HYDROSS is a surface water supply model developed to assist in planning studies for <br />evaluating existing and proposed demands on a river system. It is intended to operate over the period <br />of record, simulating the effect of the existing and proposed features on the historical Ilristine flows. <br /> <br />1.3 Hardware and Software Requirements <br />The program is written entirely in FORTRAN V, and the present version is compiled with <br />Microsoft FORTRAN 5.0. The executable program requires less than 200k bytes, plus space for the <br />data arrays which are dynamically allocated. The program was developed on a 80386 AT -compatible <br />PC under DOS 3.30. <br /> <br />1.4 Summary of the HYDROSS Model <br />HYDROSS (Hydrologic River Operation Study System) is a system of computer programs for <br />use in conducting monthly water supply studies and can be thought of as a hydrologic accounting <br />model. HYDROSS is a very powerful water supply analysis tool in that it allows the user the <br />flexibility to conduct "what if' studies with ease. HYDROSS can be run on the CYBER system and <br />also on a Personal Computer. <br /> <br />Basic input to the HYDROSS model consists of three data files; flow data, table data and <br />network data. Conceptually, the Flow File contains the pristine monthly flow data at gaging stations <br />in the system to be modeled. The Table File is a means for introducing operational parameters into <br />the model. The Network File furnishes HYDROSS with a physical description of the study area: how <br />the stations connect, physical facilities and supply requirement locations. <br /> <br />HYDROSS operates on the data in a strict sequential order in time (results from one month <br />depend on the system state at the end of the previous month), space, (results at one station depend on <br />what is happening upstream andlor downstream), and priority (earlier water right dates are allowed <br />water before later water right dates). <br /> <br />March 25, 1991 <br /> <br />HYDROSS 4.1 <br /> <br />Page 1 <br />