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CHArTER IV EST~_l1!'~['f:r~~C)ST~ General Estimated costs for construct-ion of tile proposed drainage improve- ments are presented in this chapter. TttP f~s1_imates of construction cost are based on the implementation of the proposed drainage improvement~s presented in Drawings 11 through 32. Allernati,'c schemes or materials may be proposed during final design w~lich wOlllel change the costs pre- sented herein. However, these costs 1~111 provide a guide for planJling the implementation of the proposed dr~:,in'lgf'way improvements in Fir:~t Creekc The cost estimates are based on Fet)[uary, j 975, construction costs for similar projects. Costs wil'L increase considerably in the future ~hen the project is construc~ed if the C~lrrent economic trends continue. The cost of engineering, legcll fces, and 3_dministrative costs which wil] be required during the :implenlcntati_dn of this project have been f'stil1ated as a percentage of the t.ot-a:: construct_ion cost. Approximately 8% of the field cost has been used for :]l:i_S. The all_oeation of constructi_on C()S~:i 3mong the District and l.()cal governments within the drainage ba::::in call he accomplished in many ways. Each entity could pay for the cOIlstrU("ti()n wtich takes place within its bounjaries, each entity could COIltribllte b.~Sf'd on the percentage of drai:1age basin area it OccupJ~es, etc. \.,Ihclever method is finally adopt- ed, 111 entities within the basin must agn"f' to j t. To date, there has been no agreement on a method of allac.)!:.: Oil cf r:onstruction costs; therl:-fore, any allocation made in th-is [(~p()rt l~ould be of little value, and has not been included. Right-of.'way required for st(uctur('~; is lo(~ated almost complet.ely within the flood plainc The price of the. flood plain property will be h:ighLy infJuenced by the fact that it may l)~ zoned as flood plain. In many cases local governments and deve]oIwIs '.....'i l:i_ work out~ Lrades whereby IV-]