The Queensland Floods Commission of Inquiry will return to the task of examining Brisbane's Wivenhoe Dam, and its role in January's flood.
The Brisbane River's January 13 flood peak inundated about 14,200 properties in the city.
Engineers in charge of releasing floodwaters from the dam have already fronted the inquiry, saying they operated by the book - in this case, the flood mitigation manuals for the dam.
Department of Environment and Resource Management director-general John Bradley is to face the inquiry on Monday, as well as the department's director of dam safety, Peter Allen.
Mr Allen is Mr Bradley's delegated authority to approve or order amendments to the dam manuals.
The inquiry is also likely to look at why water wasn't released from Wivenhoe Dam as a pre-emptive measure before summer, given it was safely lowered to 75 per cent capacity after the floods.
Water Utilities Minister Stephen Robertson has already told the inquiry he sought advice on a pre-emptive release in October 2010, when the government was told Queensland was in for an extreme wet season.
Authorities told Mr Robertson a small release was unlikely to make much difference.
Reams of correspondence between Mr Robertson, Mr Bradley and other authorities are before the commission.
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