Effects of Land Use Condition on Flood Runoff Characteristics

Woodlands, gominks and playground

Abstract

This paper deals with the flood runoff characterstics in the experimental basin comprised of a woodlands, a golflinks and a playground, as part of the study of the effects of land-use condition on runoff characteristics.
The flood runolf characteristics in each basin were examined comparatively from the view points of the time of concentration, the coefficient of peak runoff, the equivalent roughness of the kinematic runoff model and the parameter of the storage function model.
The following results were obtained:
(1) By converting a woodlands to a golflinks, a baseball ground and a playground, the concentration time is reduced by 3/4-1/2, and the coefficient of peak runoff increases several times.
(2) Rain water flow over a slope can be simulated by using the kinematic runoff model of the Manning type, regardless of how land is used.
(3) The watershed model for applying the kinematic model can be extremely simplified.
(4) The proper values of the equivalent roughness (m^-1/3⋅s) are as follows: 1.0 for a woodlande, 0.2-0.3 for a golflinks and 0.03-0.05 for a playground.