 Four years after the Bighorn Fire, Pima County and Oro Valley officials are addressing sediment and debris in the CDO wash. Pima County Regional Flood Control District Community Engagement Manager Camille Hall says if they were to do nothing... ...subjective rates of flow coming down that channel in response to the Bighorn Fire, we might actually see overtopping of the banks. I'm John Gilliland and you're listening to Arizona News.