In order to better understand the chronology of the flood, as well as the lunar-solar calendar, I've created a simpler graphical representation showing the flood chronology DAY BY DAY.
The chart simplifies the counting of days of the flood scenario; 40 days of rain, 150 days of the flooded earth, 30 days of the waters decreasing until mountain tops seen, 40 days of waiting, 21 days of sending forth messengers, 28 days until the beginning of the next year (Noah's 601st year), and the final 56 days until the 27th day of the second month of the following year.
In this chart, you will see alternating 29 and 30 day months, to compensate for the 29.53 days of the lunar cycle. Six of the months have 29 days, and six of the months have 30 days. The reason that specific dates in months are given, is to show where the period of days is anchored. For instance, the 1st day of the tenth month shows where to anchor the 40 day period that Noah waited for the water to decrease.
Proponents of the 30 day month, 360 day year will find an inherent problem trying to reconcile the the 360 day year with the chronology of the flood.
The entire flood period, from the 17th day of the 2nd month, at the beginning of the flood, until the 27th day of the 2nd month the following year, is a period of 365 solar days, which includes 354 lunar days. The flood chronology accounts for the difference of 11 days between the two calendars, the lunar and solar.
If you add in the additional 30th day in the other six months, the result will be a 371 day solar year.
PDF available here: