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the flow of sto-~r~ water, the subdivider shall be required to provide for or contribute to the installation of such facilities in one or both of the following manners: (a) Construct such off-site drainage facilities in accordance with plans and specifications approved by the city engineer. Construction by the developer shall be undertaken only if permitted by fha city engineer. The subdivider shall pay the cost or so much thereof as the city shall direct. (b) Contribute his pro rata share of the costs of such facilities as are needed to properly control storm %~ater flow in a 'designated drainage area, said share to be calculated as follows: (1) Drainage areas shall be designated by the city engineer in accordance with sound engineering principles. (2) Off-site drainage facilities needed to properly control present and anticipated storm water flow in such areas shall be designed by tke department of engineering in accord- ance with sound engineering principles taking into consider- ation (among other things) the zoning and zoning patterns of the subject dra!nage area, the duration and frequency of rain- fall in such area during a stor~ return period of five years using U. S. Department of Commerce curves and statistics and suitab!e run-off coefficients ~s ~e~ermin~d by the city e~gine~r for the different types of zonlnc in such area. (3) The total ~ost of such off-site facilities (including land or easement acquisition and any other incidental costs) shall be estimated by the department of engineering based upon current prices plus a percentaqe of such cost to reflect estimated cost rise over the ensuing five years. Such cost rise estimate will be determined by use of U. S. Depart- ment of Labor consumer price indices to project price increase trends. (4) The design and estimated cost of such off-site drainage facilities shall be re-evaluated ~very five years prior to construction. Any changes in cost estimates shall be re- flecte~ by either an increase or decrease in those pro rata shares remaining to be paid. k 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- ~20-