104 STAT. 3298 PUBLIC LAW 101-618—NOV. 16, 1990 age of such diversions chargeable to the gross diversion allocations of each State shall be specified in the Operating Agreement; and (iii) the provisions of paragraph 204(b)(1) notwithstanding, criteria for charging incidental runoff, if any, into the Carson River basin or the Truckee River basin, including the amount and basin to be charged, from use of water in excess of the amount specified in clause (i) of this subparagraph, shall be specified in the Operating Agreement. The amounts of such water, if any, shall be included in each State's report prepared pursuant to paragraph 204(d)(1) of this title. (B) Unmetered diversion or extraction of water by residences shall, for the purpose of calculating the amount of either State's gross diversion, be conclusively presumed to utilize a gross diversion of four-tenths of one acre-foot per residence per year. (C) Where water is diverted by a distribution system, as defined in clause (iii) of this subparagraph, the amount of such water that shall be charged to the gross diversion allocation of either California or Nevada shall be measured as follows: (i) where a water distribution system supplies any municipal, commercial, and/or industrial delivery points (not including fire hydrants, flushing or cleaning points), any one of which is not equipped with a water meter, the gross diversion attributed to that water distribution system shall be measured at the point of diversion or extraction from the source; or (ii) where all municipal, commerical, and industrial delivery points (not including fire hydrants, flushing or cleaning points) within a water distribution system are equipped with a water meter, the gross diversion attributed to that water distribution system may be measured as the sum of all amounts of water supplied to each such delivery point, provided there is in effect for such water distribution system a water conservation and management plan. Such plan may be either an individual, local plan or an area-wide, regional, or basin-wide plan, except that such plan must be reviewed and found to be reasonable under all relevant circumstances by the State agency responsible for administering water rights, or any other entity delegated such responsibility under State law. Such plan must be reviewed every five years by the agency which prepared it, and implemented in accordance with its adopted schedule, and shall include all elements required by applicable State law and the following: (a) an estimate of past, current, and projected water use and, to the extent records are available, a segregation of those uses between residential, industrial, and governmental uses; (b) identification of conservation measures currently adopted and in practice; (c) a description of alternative conservation measures, including leak detection and prevention and reduction in unaccounted for water, if any,
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