This data represents the waterways of Salt Lake County, including streams, rivers, canals, drains and ditches. The data indicates Designated Salt Lake County Flood Control Facilities as per County Ordinance Chapter 17.08.04 Permits are required, but not limited to, these specific canals, drains, ditches and streams. The data is accurate for identifying the general location of these facilities. For specific information about permits, contact the Flood Control Permit Coordinator in the Engineering Division. Addition, the waterways layer will have non ordinace facilites for general and historical purposes.The valley streams were originally digitized from 6-inch color aerial photgraphy 2009 and 2010. Tree canopy obscured some reaches and are less accurate in those cases. Mountain streams were originally digitized from the 2006 NAIP and has been since updated with 1-foot pixel color aerial photography in 2010, available mosty for the lower canyon areas. In 2011, the data has been updated with high-resolution alignment adjustments at 1:1000 to 1:2000 scale, using 2010 aerial imagery, 2009 LIDAR, historical flood control plans from 1983 and 1986. In 2013, the data has been updated with high resolution 2012 aerial imagery and the waterways was realigned at 1:600 to 1:1000 scale.