Cal. Code Regs. tit. 23 § 3939.5
On July 10, 2003, the Los Angeles Regional Water Quality Control Board (Regional Board), adopted Resolution No. 2003-010 amending the Water Quality Control Plan for the Los Angeles Region (Basin Plan). The amendment revised the Basin Plan by suspending the recreational beneficial uses in engineered channels during unsafe wet weather conditions, and creating a new Table 2-1a "Recreational Beneficial Uses of Inland Surface Waters," which designates the 39 water body segments to which the High Flow Suspension would apply. The following text is added to Chapter 2 of the Water Quality Control Plan:
"The High Flow Suspension shall apply to water contact recreational activities associated with the swimmable goal as expressed in the federal Clean Water Act section 101(a)(2) and regulated under the REC-1 use, non-contact water recreation involving incidental water contact regulated under the REC-2 use, and the associated bacteriological objectives set to protect those activities. Water quality objectives set to protect (1) other recreational uses associated with the fishable goal as expressed in the federal Clean Water Act section 101(a)(2) and regulated under the REC-1 use and (2) other REC-2 uses (e.g., uses involving the aesthetic aspects of water) shall remain in effect at all times for waters where the (ad) footnote appears in Table 2-1a. The High Flow Suspension shall apply on days with rainfall greater than or equal to ½ inch and the 24 hours following the end of the 1/2-inch or greater rain event, as measured at the nearest local rain gauge, using local Doppler radar, or using widely accepted rainfall estimation methods. The High Flow Suspension only applies to engineered channels, defined as inland, flowing surface water bodies with a box, V-shaped or trapezoidal configuration that have been lined on the sides and/or bottom with concrete. The water bodies to which the High Flow Suspension applies are identified in Table 2-1a in the column labeled "High Flow Suspension".
In Chapter 2, a new table is added, Table 2-1a "Recreational Beneficial Uses of Inland Surface Waters" following Table 2-1 "Beneficial Uses of Inland Surface Waters".
Cal. Code Regs. Tit. 23, § 3939.5