In resent years, clients of new detached houses in snowy regions tend to be careful for roof snow removal. These houses are called as "snow-surmountable housing" and subsidized by many municipalities. In this paper, a grouping of the snow-surmountable housing and its new trends of regional expansion are presented using data from a questionnaire into residents of Obanazawa city.
The rapid increase of high-floor type housing accompanied with snow-slipping roofs, mostly 3-storied, is shown through a comparison between newly constructed housing and existing housing stock. The residents of snow-surmountable housing feel very high advantage for snow treatment, while there are some problems, such as, the lack of housing type suitable for densely built-up area, and so on. Implications for future technical and political improvement are reviewed.

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This paper concerns with the solid concentration distribution in snow-water two-phase flows in a horizontal pipe. The solid concentration distribution was theoretically investigated, based on a diffusion equation of solid particles. In order to confirm the validity of the model, the measurement of solid concentration distribution was conducted. At lower velocities, solid particles concentrated in the upper region, and not dispersed in the lower region of the pipe. At higher velocities, particles dispersed uniformly overr the cross section of the pipe, and solid concentration distribu-tions were approximately flat.
The calculation on solid concentration distributions from this present model were compared with the experimental ones. The agreements were satisfactory.

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