|WORLD METEOROLOGICAL ORGANIZATION||
|Explanation of the criteria for classification and numbering of components||
|Explanation of the dates on the component's description|
1. Purpose and objectives
The tank model is a simple non-linear model that will transform
precipitation into discharge for the forecasting of daily discharge or flood discharge. Once the parameters have been determined, use of the model is very easy by hand using tables or by portable desktop computer.
The tank model is composed of several tanks -- usually four tanks for daily discharge forecasting and two or three for flood forecasting -- laid
vertically in series. Each tank has outlets or an outlet on the side and an
outlet on the bottom. Outputs through side outlets form the estimated discharge while outputs through bottom outlets simulate infiltration. The estimated discharge is composed of components from each of the tanks that corresponds to surface, intermediate, sub-base and base runoff. Rain water is distributed to each components automatically by this simple model. There
(a) For daily discharge analysis :
Daily precipitation (3 - 5 rain gauges are preferable); daily or
(b) For flood analysis :
Usually, hourly precipitation and discharge. Appropriate time unit
5. Operational requirements and restrictions
(a) A few persons are required, who have interest and knowledge of
(b) Three months training is preferable, using preferably the data of
(c) Automatic calibration program is difficult for small computer,
6. Form of presentation
Diskette or CD with software programs. Computer program in FORTRAN IV is also presented as a listing. Program contains many comments for users.
7. Operational experience
The tank model is applied not only to the basins in Japan but also to
basins in Asia, Africa, Europe and U.S.A. and gives good results.
8. Originator and technical support
National Research Centre for Disaster Prevention
10. Conditions on use
Without any conditions.
| Reclassified from J05.1.01 MAR 1987
(First entered: 30 JAN 81
Last updated: 11 SEP 81)