Nim Kidd, chief of the Texas Division of Emergency Management and representatives from the Upper Guadalupe River Authority are expected to testify.

Gov. Greg Abbott said responding to the devastating July 4 floods is his top priority for a special legislative session that began Monday, including providing relief to victims and improving early warning systems.

Testimony will be heard from those in charge of managing rivers as well as emergency managers and first responders about the flash flooding that killed at least 135 people.