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TITLE 22, CALIFORNIA ADMINISTRATIVE CODE TITLE 22, CALIFORNIA ADMINISTRATIVE CODE 9. Protect against adverse effects in areas subject to freezing weather. (c) The source capacity Of a purchased water connection between two ..OTE Authority cited:Sections 208 and 4010.1 (h),Health and Safety Code.Reference: Sections 4010.1 (h),4012,4013 and 4019, Health and Safety Code. public water systems shall be included in the total source capacity of the - 64561. purchaser if the purchaser has sufficient storage or standby source capacity to Reliability. meet user requirements during reasonably foreseeable shutdowns by the NOTE Authority cited:Sections 208 and 4010.1 (h),Health and Safety Code.Reference: supplier. Sections 4010.1 (h),4012,4013 and 4019, Health and Safety Code. (d) Where the capacity of a source varies seasonally, the source capacity HISTORY: shall be the capacity at the time of maximum day demand. 1. Amendment filed 10-9A5;effective thirtieth day thereafter (Register 85,No. 42). NOTE Authority cited:Sections 208 and 4010.1 (h),Health and Safety Code.Reference: 64561. Quantity of Supply. Sections 4010.1 (h),4012. 4013 and 4019, Health and Safety Code. (a) Sufficient water shall be available from the water sources and distribu• 64564. Procedures for Determining Needed Source Capacity and tion reservoirs to supply adequately,dependably and safely the total require- Needed Storage Volume. ments of all users under maximum demand conditions before agreement is (a) Whenever possible,needed source capacity and needed storage volume made to permit additional service connections to a system. shall be determined from existing water use records of the water system. (b) To ascertain this,first determine the total capacity of the existing source The records used shall clearly indicate total source capacity, total storage by procedures prescribed in Section 64563 and determine the total storage volume and maximum day demand of previous years. / volume of the existing distribution reservoirs. Then determine the needed The existing records of the water system may be supplemented as needed source capacity and the needed storage volume by procedures prescribed in by the records of a similar water system acceptable to either the Department Section 64564. The total available source capacity shall not be less than the or a qualified registered engineer. needed source capacity. (b) When the existing records of the water system are inadequate to (c) The requirements of this section shall apply to an entire public water determine these values and no records of a similar water system can be found system and e each pressure zone within a public water system. to supplement the existing records, the maximum day demand, the needed (1) Requirements for an entire public water system shall be determined source capacity and the needed storage volume for typical residential and from the total source capacity, total storage volume and the total number of general commercial areas (without provisions for fire Flow) shall he deter- service connections. mined as follows: (2) Requirements for a particular pressure zone shall be determined from (1) Determine the maximum day demand (Qo) from Chart 1 or Chart 2. the total water supply available from the water sources and interzonal t(2) When[ total capacity g the existing sources equals the maximum day volume within the demand (Qo), the needed storage volume (Vo) to meet peak deman transfers directly supplying the zone,from the total storaged during the day shall be determined from Chart 3 or Chart 4. zone and from the number of service connections within the zone. (3) When the total storage volume of the existing reservoirs (V) is less than NOTE. Authority cited:Sections 208 and 4010.1 (h),Health and Safety Code.Reference: the needed storage volume (Vo),the existing sources shall be supplemented so Sections 4010.1 (h),4012,4013 and 4019, Health and Safety Code. that the needed source capacity (Q) is met.For a metered water system,Q = H . Qe (25-1.5VIVo) or for a flat rate water system, Q = Q. (2-V�Ve). 1. Amendment effective thirtieth day thereafter (Register 85, No.42). (c) The needed source capacity and needed storage volume determunq 1. Amendment filed 1 64563. Procedures for Determining Source Capacity. under (b) may be modified, with the approval of the Department, to reflect (a) The source capacity of a well shall be based on the sustained yield of the local conditions such as climate,community type and kinds of users.Unless the well or pump output, whichever is less. Department's written approval is obtained, the needed source capacity shall (1) Sustained yield of a well shall be determined from a pump test or from not be less than the maximum day demand. historical records. (d) The data used and the calculation made by the water supplier to (2) The conditions of a pump test used to determine sustained yield of a determine whether sufficient water is available to accommodate additions to well shall be acceptable to the Department and shall include: the systems must be kept and are subject to the Department review and (A) Constant rate of water discharge from the well during the pump test. approval at its discretion. (R) Continuation of the pump test until at least four consecutive measure- NOTE: Authority cited:s,•,eons 208 and 4010.1 (h),Health and Safety Code.Reference: ments of water level drawdown in the well and the elapsed time since the Sections 4010.1 (h),4012 9013 and 4019, Health and Safety Cade. beginning of the pump test yield a straight line when the drawdown is plotted H 1. Amendment filed 10-9135;effective thirtieth da thereafter Re against the logarithm of the elapsed time. v (Register 85, No.42). (b) The source capacity of a surface water supply or a spring shall be the lowest anticipated daily yield,based on adequately supported and documented data y