What are the three categories of engineering models?

Washington state is under a state of emergency after days of torrential rain caused rivers rise to historic levels, raging out of their banks. With several water rescues already underway, over 100,000 Americans face flood evacuations. Trevor Ault reports.

Iyanii receiving the Head of State Commendation Award from His Excellency President William Samoei Ruto at State House Nairobi @Iyanii #fyp #kenyantiktok🇰🇪

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Washington Weather Chasers on Instagram: "Flooding is continuing in Washington state, and the Green River has a levee breach today sparking a flash flood warning and emergency evacuation. #wawx #weather #flood #atmosphericriver #flooding #washington"