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period of five years using U. S. Depart- ment of Commerce curves and statistics and suitable run-off coefficients as de- termined by the city engineer for the different types of zoning in such area. (3) The total cost of such off-site faci- lities (including land or easement acqui- sition and any other incidental costs) shall be estimated by the department of engineering based upon current prices plus a percentage of such cost to reflect esti- mated cost rise over,the ensuing five years. Such cost ~ise estimate will be determined by use of U. S. Department of Labor consu~aer price indices to project price increase trends. (4) The design and estimated cost of such off-site drainage facilities shall be re- evaluated every five years prior to con- struction. Any changes in cost estimates shall be reflected by either an increase or decrease in those pro rata shares remaining to be paid. A rebate shall be made to those having already contributed their share if a decrease in pro rata share is calculated. (5) A construction fund for each drainage area shall be established by the city into which pro rata shares shall be contributed by the developer prior to final plat approval. Shares paid after construction shall be based upon actual cost and shall be paid to the city. A rebate shall be made to those de- velopers having contributed prior to con- struction if the actual cost of construction is less than the previous estimate. (6) The pro rata share of each developer or entity shall be calculated by estimating that portion of the total storm water run-off using said off-site facilities which can be attri- buted to the subject development taking into consideration the size and type of the pro- posed development, the amount of rainfall anticipated in said development and the ap- propriate run-off coefficients applicable thereto. The cost of enlarged or additional -2-