PUBLIC LAW 101-618—NOV. 16, 1990 104 STAT. 3299 which would improve the efficiency of water use, with an evaluation of the costs, and significant environmental and other impacts of such measures; (d) a schedule of implementation for proposed actions as indicated by the plan; (e) a description of the frequency and magnitude of supply deficiencies, including conditions of drought and emergency, and the ability to meet short-term deficiencies; (f) an evaluation of management of water system pressures and peak deman(£; (g) an evaluation of incentives to alter water use practices, including fixture and appliance retrofit programs; (h) an evaluation of public information and educational programs to promote wise use and eliminate waste; (i) an evaluation of changes in pricing, rate structure, and regulations; and (j) an evaluation of alternative water management practices, taking into account economic and non-economic factors (including environmental, social, health, and customer impact), technological factors, and incremental costs of additional supplies, (iii) As used in this subparagraph, the term "water distribution system" means a point or points of diversion from a water supply source or sources, together with associated piping, which serve a number of indentifiable delivery points: Provided, That the distribution system is not operationally interconnected with other distribution systems (except for emergency cross-ties) which are served from other points of diversion. An agency serving municipal and industrial water may have more than one water distribution system. (iv) If a program for the review of water conservation and management plans as provided in clause (ii) of this subparagraph is not in effect in that portion of the Lake Tahoe basin within a State, all gross diversions within such State shall be measured at the point of diversion. (D) For the purpose of this subsection, water inflow and infiltration to sewer lines shall not be considered a diversion of water, and such water shall not be charged to the gross diversion allocation of either State. (E) Regulation of streamflow for the purpose of preserving or enhancing instream beneficial uses shall not be charged to the gross diversion allocation of either State. (3) The transbasin diversions from the Lake Tahoe basin in Nevada and California identified in this paragraph may be continued, to the extent that such diversions are recognized as vested or perfected rights under the laws of the State where each diversion is made. Unless otherwise provided in this subsection, such diversions are in addition to the other allocations made by this subsection. Such transbasin diversions are the following:
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