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I I I I diameters required for passing the design flow. Also, a cost estimate is included for the box culvert. a precast system. I I I I I I I I I ....... Figure 4. Formed concrete texture (Image from w\\'\v.incrcte.coml) 6.\ ALTERNATIVE 1- EXISTING CHAl'(NEL SHAPE This alternative would call for a complete replacement of the channel with steel reinforced concrete as the lining material. The channel will be replaced to the existing channel prism shape and dimension as permitted. A general layout drawing of this alternative could be referenced in Figure A2 in Appendix A. The advantage of this design is that the channel would not change significantly from its existing appearance and preserve its historical presence. Excavation and reshaping oCtile channel will be minimal. I I I I I I The disadvantage for this alternative is the construction access. As shown by the Corps' design drawings, rights of way and temporary construction easements were also limited during the initial construction. Construction casements shown have since been built upon. As a disadvantage, structure encroachments today would cause the temporary construction easements to be a challenge. Constructing to the existing right of ways would pose the biggest and most expensive cost of bypassing the now in Willow Creek. Construction activities should be scheduled during low flow months taking advantage of a minimized bypass system. Safety fencing will also he installed to protect people and animals from falling into the newly replaced channel even though currently there are no such hardware throughout. Safety cables are included in the appurtenance structures section of this report. I Images obtained fmm www.incn;t'::.comdonnt mean that this report supports and promotes thdr product. Any construction of such equipment will be competitively bid and awarded. For lack of photos demonstrating this technique to the client. images from this source are used. NRCS Northern Plains Engineering Team 6