Economic estimation of construction of snow-removing ditches using the amount of snow damage has been made in an urban area of 20.45 km 2 . Construction is economical in the commercial district and neighborhood in a year of snow scarcity, and also in years of snow abundance in residential districts. REFERENCE Umemura, T ., S. Kamimura and H. Otaki. 1992. Snow damage on an urban area with heavy snow fall: definition of the amount of snow damage and appraisal. Journal of Natural Disaster Science, 13(1), Ill.
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