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40 Tables H, I, J and K show the detailed calculation of re­serve requirements and annual depreciation expense. Annual Depreciation Expense Requirements Annual depreciation expense estimates have been developed on the straight-line basis using the same service lives and ages as those used in estimating the reserve requirements. Tables H and I cover the plant of the Water Utility, and Tables J and K set forth similar figures for the production facilities owned by Los Angeles & Salt Lake Railroad Company. The results of these calculations are incorporated in the various ^summaries of operations (Tables L to P, inclusive). In computing the allowance for the annual depreciation chargeable to operating expenses, no amount is provided for the de­preciation of defense capital. Tables H and I show the manner in which this expense is eliminated. Advances in Aid of Construction The Water Utility makes main extensions to new customers and to new subdivisions in accordance with a definite policy as provided in its rules and regulations (Rules 9 and 9A), which have, been approved by the Public Service Commission. In substance, the Water Company makes free extensions when such do not exceed 50 feet, exclusive of the service pipe. Beyond such distance, applicant for service must advance the estimated cost of the extension. The monies so advanced are refunded at the rate of 50$ of the monthly water bill over a period of 10 years. If not fully repaid within the 10-year period, the remaining balance is not refund­able. The Water Utility at all times has legal title to the extension and must operate, maintain and replace such extension at company cost. As a practical matter, the advances received under this headr­ing (carried in Account 173) have been made almost entirely by real estate subdividers and not by individual home owners. The advances