|WORLD METEOROLOGICAL ORGANIZATION||
|Explanation of the criteria for classification and numbering of components||
|Explanation of the dates on the component's description|
HYDROLOGICAL RAINFALL RUNOFF MODEL (HYRROM)
1. Purpose and objectives
HYRROM is a conceptual rainfall runoff model developed for use on IBM
compatible personal computers. The program has been designed to be easy to
use, with no requirements to understand the computer operating system or
the structure of the data files. Output is in the form of colour screen
The main use of a rainfall runoff model is to estimate river flows from rainfall and evaporation data. In HYRROM, flows are estimated using a simple, but realistic, representation of the physical processes which govern flows in a catchment.
The HYRROM model uses the concept of "stores" to keep account of the
passage of water through a catchment. These stores can fill or empty
during a simulation, and provide a contribution to runoff which varies with
the volume of water they contain. Four stores are used: a surface routing
store, an interception store, a soil store and a groundwater store. The
user has access to 9 of the parameters which define the timing and
magnitude of the flow from these stores. By varying these parameters, the
Some typical applications of the model are: infilling missing flow
data, quality control of data, extending historical flow records,
generating synthetic flow sequences, water resources assessment.
For calibration, the model requires a sequence of catchment average rainfall and river flow records. Either daily or monthly records can be used. Evaporation data must also be provided, preferably on a daily or monthly basis. However, if these are not available, annual data, or synthesized values, may also be used.
The data must be contained in an ASCII (i.e. normal text) data file.
A data preparation program is provided to assist with preparing this input
data file. For users of the Institute's HYDATA database system (HOMS
Component no. G06.3.02), an option is provided to abstract the required
data directly from the database.
Screen graphics provide the main form of output. Hard copies of graphs can be produced on pen plotters, graphics printers or laser printers. Graph formats can be re-designed by the user. All results are also written automatically to ASCII data files for easy transfer to other software.
Text and screen graphics will operate in monochrome or colour.
5. Operational requirements and restrictions
HYRROM is guaranteed to run on the following system: IBM AT, PS/2 or
compatible (minimum 640k memory), high resolution graphics monitor,
IBM/Epson graphic printer, HPGL compatible plotter (6 pens). A hard disk
with at least 2 Mb free space is required.
6. Form of presentation
HYRROM is supplied on a number of IBM compatible 1.44 Mb diskettes.
The software is accompanied by a comprehensive user manual in English.
7. Operational experience
The model has been used successfully on a wide range of hydrological
studies, both in the United Kingdom and abroad.
8. Originator and technical support
The Institute of Hydrology, Wallingford.
10. Conditions on use
As given in the agreement of sale. A charge is made for the software.
|(First entered:25 OCT 90||
Last updated: 17 MAR 92)