The proposed amendments to R309-510 include the following: 1) revise Section R309-510-4 to clarify that water system-specific sizing criteria may be used if a reduction is granted by the director, and add language to state that in addition to meeting the state's minimum sizing requirements, the design of drinking water source and storage capacities may be required to be based on specific requirements imposed by local authorities; 2) revise Section R309-510-5 to clarify the process to obtain a reduction of sizing requirements. Also clarify the requirements for granting a reduction on the basis of limited water use development; 3) revise Subsections R309-510-7(2) and (3) to clearly state that indoor water use and irrigation water use shall be based on the minimums provided by the rule unless a reduction in sizing has been granted by the director; 4) clarify, define, and correct the term "Recreational Home Development" as used in Tables 510-1 and 510-4; 5) clarify irrigation demands in Subsection R309-510-7(3) by adding a statement to take into consideration water losses associated with evaporation, delivery method, pipe leaks, etc., when irrigation demand is included in the design; and 6) allow for the use of Appendix B of the 2015 International Fire Code in determining fire flow when local fire code officials do not provide requirements, including a minimum flow of 1,000 gpm for 60 minutes. Note: This change is based on input from various fire marshals.