The variation in season strongly makes impact on the result of the construction work. Heavy rainfall in autumn and spring, low temperature in winter causes problem in efficiency. High percentage of water in landfill or ground frost means different methods in excavation and transportation of the material. Low stability in wet soil may cause that sheet piling has to be used or widening the excavated area to allow higher angle in side walls to avoid rubble. Ground frost may cause the landfill to be thawed or blasted before excavation.

The purpose with the project was to investigate the different weather seasons and see what kind of impact this have on the water and the drain production. The work was analyzed from two different production stages in Kristinehamn whit the purpose to use the result in future bid calculations. The three different tasks that are included in the investigation is excavation, install water and draining pipes and restore the excavated area. The report does not take any primary tasks like removing vegetation or blasting to account.

The material to the work was retrieved from Peabs database Ärbas. There diary notes, preliminary time schedule for the project, Geotechnical data, preplanning and design drawings. Some parts of the construction zones were not chosen to be included in the investigation because these were performed differently compared to the other parts.

The result gave that the seasons had an influence on the production and showed that it could vary to over 10 produced meter per day. It was a clear connection how the production was changed by temperature increases and temperature decreases. During autumn the production decreased, while it increased during the spring. The highest result occurred during the summer. No connection to how rainfall affected the production was found.

During the study it also was found that the excavators had problems to doze the soil when the ground frost reached a depth of 0,5 meters. To avoid these problems, calculations were done to see what temperatures were required for a half-meter pitch. For the calculations, there were used categorized values according to the soil conditions that were in Kristinehamn. The result showed that it`s enough with -2,85 to -7,13 degrees Celsius in twenty days for the ground frost to reach this depth.