Kadoya Model
The Kadoya model routes flow using the Quasi Linear Reservoir Method, used as a standard runoff model in Japan.
See the Japanese Runoff Methodology technical paper for further information.
The basic equations of the method are as follows:
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where: S: facade storage water depth in a river basin (mm) K: characteristic coefficient of basin q: runoff depth (mm/hr) re: intensity of effective rainfall (mm/hr) tc: time of concentration (min) C: coefficient representing characteristics of basin rave: averaged intensity of effective rainfall (mm/hr) A: area of basin (km2) |
Equation 4) is called equation of Kadoya.
To use the Kadoya Model in InfoWorks ICM, set the Routing model field for the Runoff Surface to Kadoya and enter the value for the Kadoya coefficient, C, in the Runoff routing value field.
Standard values of C are shown below:
| Basin Description |
C (Kadoya coefficient) |
|---|---|
| Hill slope, mountainous area | 290 |
|
Housing lot before housing |
90 - 120 |
| Pasture, golf links | 190 - 210 |
| Residential area | 60 -90 |
