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Development of an Updated Expected Adverse Weather Day Chart

Seasonal and daily weather events impact construction projects in various ways across the different climatological zones of South Dakota. Depending on the type of construction project, its location, and stage of completion, moisture and temperature variations may lead to construction delays and subsequent requests for contract time extensions. Past experiences have shown significant time and effort are spent on settling disputes between what the contractor and the South Dakota Department of Transportation (SDDOT) consider to be a reasonable number of expected adverse weather days during the contracting period. Objectives of this study are as follows: (1) Develop criteria and guidelines to establish the number of available, construction working days on a weekly basis for the variety of construction project types across South Dakota. (2) Develop classification maps based upon significant geographical factors and climate that can be used to determine expected adverse weather days and related construction working days. (3) Develop weekly expected adverse weather day tables and charts that can be used for the variety of construction project types across South Dakota. (4) Recommend how best to use expected adverse weather day tables and charts for the contract administration of projects with working day, calendar day, and fixed completion date contracts.