FLOOD02324 - Laserfiche WebLink

Home Browse Search

~ Mr. L. Scott Tucker February 15, 1974 DG 223/74 - Page Two - Preliminary Designs Preliminary designs for the entire Niver Creek have been prepared in accord- ance with the decisions reached by the District at their meeting of August 14, 1973 and summarized by Mr. J. Gianola in his letter of August 15, 1973 to the various entities involved in the study. Most of the channel has been designed for the 100-year flood; certain structures have been designed for lesser flows; and portions of the channel have been recommended for flood plain zoning in lieu of providing channel improvements. The decision to design for flows less than the 1oo-year flood was based on a comparison of construction costs with resulting damages. The recommended preliminary designs are presented in Plates 1\ 1-3 through 111-12. Cost Estimates ~ Field constructian costs for the project have been computed and are summarized in Table IV-3. The total field construction cost is estimated to be $1,762,000; however, this figure does not include engineering fees, legal fees or land acquisition costs as dis- cussed in the report. We estimate that these costs will increase the total project cost to $2,500,000. 4 The overall estimated project cost is less than the estimate given in the Phase A report, because the present designs are more refined than those used in the Phase A report and because economies were achieved by modifying the channel improvements conceived during the Phase A studies. - A table of average annual costs of the "Do-Nothing" and recommended schemes is also presented to readily allow a comparison of the benefit which can be derived by implementing the proposed scheme. Conclusion .' The work performed in Phase B confirms the conclusion of the Phase A report that the recommended i~rovements wi II be very effective and economical in reducing flood damoge in the Niver Creek Basin. ..