(1) This rule applies to the mainstem of the Spokane River and all surface water and groundwater within the boundary of the SVRP aquifer, as identified in U.S. Geological Survey Scientific Investigations Report 2007-5041. The map provided in WAC 173-557-110 is for informational purposes only. Hydrologic evidence of the SVRP aquifer determines applicability of this rule.

(2) This rule does not supersede the instream flow rule of the Little Spokane River (chapter 173-555 WAC), except where a proposed withdrawal is from waters in hydraulic continuity with the SVRP aquifer as determined by ecology. In the area where this rule and chapter 173-555 WAC overlap, the application of each rule shall be determined as follows:

(a) New water use from the Little Spokane River, its tributaries, and the shallow aquifer associated with the Little Spokane River and its tributaries that is not part of the SVRP aquifer shall be regulated under chapter 173-555 WAC; and

(b) New water use from the SVRP aquifer shall be regulated under chapter 173-557 WAC.

(3) Chapter 173-557 WAC applies to the use and appropriation of surface water and groundwater begun after the effective date of this chapter. This chapter shall not affect:

(a) Existing surface water and groundwater rights established prior to adoption of the state surface water and groundwater codes, or by water right permit authorized under state law, unless otherwise provided for in the conditions of the water right in question;

(b) Groundwater rights established under the groundwater permit-exemption in RCW 90.44.050 where regular beneficial use began before the effective date of this chapter; and

(c) Federal and tribal reserved rights.

(4) Changes to or transfers of existing rights are addressed in WAC 173-557-070.