If the farmer plants 3 acres of squash at the beginning of the growing season, how much water does she need to provide via irrigation during the initial, mid, and final phases of the growing season? Assume there is 3 cm of moisture available in the soil for plant water uptake on day 1, 4 cm of moisture available on day 31, and 3.5 cm of moisture available on day 71. Additionally, from day day 71 to day 100, there was a total of 1 cm of rainfall. Also assume that groundwater flow are negligible. Report your answer in acre-ft.