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I I I I 1 1 1 1 I 1 1 1 I ,I I I I I, I CHAPTER IV ESTIMATED COSTS General Estimated costs for construction of the proposed modifications are presented in this chapter. The estimates of construction cost are based on the implementation of the proposed scheme shown on Plates 111-3 through 111-12. Alternative schemes or materials may be proposed during final design which would change the costs pre- sented herein; however, these costs will provide a valid tool for planning the imple- mentation of the rehabilitation of Niver Creek. The cost estimates are based on present day (February 1974) construction costs for public works projects. Costs will increase if the project is constructed in phases over a long period of time. Portions of the channel improvement will be constructed by private devel- opers as they develop the property along the creek. The District will not, of course, be recpired to share in these costs; therefore, the total cost of rehabilitating Niver Creek which the District and other local governments must ultimately bear will be less than the total cost presen ted herein. The cost of engineering, legal fees, and administrative costs which will be required during the implementation of this project have been estimated as a percentage of the total construction cost. In most cases, )5% of the field cost has been used. The allocation of construction costs among the District and local govern- ments within the drainage basin can be accomplished in many ways. Each entity could pay for the construction which takes place within its boundaries, each entity could contribute based on the percentage of drainage basin area it occupies, etc. Whatever method is finally adopted, all entities within the basin must agree on it. To date, there has been no agreement on a method of allocation of construction IV-l