7417

• UCREFRP Catalog Number: 7417
• Author: U.S. Fish and Wildlife Service.
• Title: Flaming Gorge Operations Study December 15, 1988-Preliminary Draft.
• USFW Year: 1988.
• USFW - Doc Type: Denver, Colorado.
• Copyright Material: NO

HYDROSS 3.0 is a system of computer programs for conducting
monthly water supply studies along traditional accounting lines.
The system allows the user to conduct "what if" studies by varying
the physical and operational parameters of the model.
NETWORK, TABLE, AND FLOW FILE DEVELOPMENT
The network file furnishes HYDROSS with a physical description of
the study area: how the stations connect, physical facilities
(reservoirs, power plants, canal capacities, etc.), and supply
requirement locations (for diversions, instream flow requirements,
return flow points, etc.). The connection to the operational
parameters is through the use of table numbers, which are then
used as pointers to the data in the table file.
The table file is the mechanism for introducing operational
parameters to the model. The two types of tables are monthly
(type 0) and parameter/function (type 1). Monthly tables contain
data which are constant for a given month, but may vary from month
to month and year to year. Each table record represents one year,
and requires twelve entries (one for each month). Tables may be
fixed (one table record for the entire study) or staged (a
different table record for each year). For staged tables, HYDROSS
uses the latest table at or before the year under consideration,
and a table for each year of the study is not needed.
Flow data is introduced into the model by the means of a natural
flow data base file which is read by the computation program. The
flow data is the pristine monthly flow at each headwater station
and at intermediate locations. In
flow for a given historical period
man-made improvements existing at
to reflect natural flows.
practice, the gaging station
will include the effect of any
the time, and must be adjusted
2