Erosion, lateral migration, and sedimentation within washes is considered a natural process and is expected to occur. This is why Pinal County requires structures to be set back from the banks of a wash. It is recommended that the wash be left alone in its natural state because altering it can have unintended consequence. If existing structures are being threatened by the erosion or lateral migration of a wash, it is recommended that you consult with a registered professional engineer. An engineer can evaluate the situation and make a recommendation to protect the structure. Note that a floodplain use permit may be required before making any improvements to the site or changes to the wash.