7320

• UCREFRP Catalog Number: 7320
• Author: U.S. Fish and Wildlife Service.
• Title: HYDROSS Background at the Fish and Wildlife Service ‎(FWS)‎.
• USFW Year: n.d.
• Copyright Material: NO

HYDROSS V3.0
Introduction
Introduction.
1.1 Overview
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HYDROSS V3.0 (HYDrologic River Operation Study System) is system
of computer programs for conducting monthly water supply studies along
t rao ~ ~ ona accounting T-i ne ~ .
The system allows the user to conduct "wh t if" studies by varying
the physical and opera Tonal parameters of the mode
HYDROSS operates only with quantities of surface water. However,
the output modules allow the preparation of data files for input to
water quality analysis programs and, with some imagination on the part
of the user, ground water effects can also be modelled.
HYDROSS V3.0 is written in Fortran 5 for the CDC Cyber 170/835_
computer. The code is ANSI Standard with a few exceptions detailed
later in the Programmer Guide section of this manual. Briefly, the
exceptions deal with passing file names to the modules, sorting, and
a 28-line subroutine with four entry points which accesses the internal
data base.
Internally, HYDROSS "thinks" entirely •in English units feet,
acres, acre-feet, and megawatt-hours. Through built-in conversion
.routines, the user may specify a wide variety of alternate units for
~~ input and output. The available units are listed in Appendix A.
1.2 Data
HYDROSS operates on three functionally distinct types of data,
briefly described below. Detailed functional descriptions of the
data components, file structures and record definitions are covered
in later sections of this manual.
1.2.1 Flow
Conceptually, the flow data is the pristine monthly flow at
gaging stations. In practice, the gaging station flow for a given
historical period will include the effect of any man-made improvements
existing at the time, and someone has to work backward to decide what
the pristine flow would have been. Obtaining this flow data is outside
the scope of this document. The required format for the data is
detailed in Appendix 6.1.
HYDROSS assumes that the data in the flow file is the pristine
flow, and the model requires flow data for each month of the study
period at each station in the model. ~
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