20240912 15430100 1.0 TRUE Slope Angle The slope angle is one of the most important factors that control debris flows and all other types of mass movements. In general, we expect an increase of debris-flow occurrences with increase in slope angle up to a point where the steepness of the slope prohibits soil layer development and debris accumulation. Wide variations (0° to 84°) in slope angles are observed in the Jazan province.