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<br />CHAI'TEI, I I <br /> <br />METHODOLOGY <br /> <br />General <br /> <br />During the Board meeting of December :~.1, 1.974, to-he Fj rst Creek <br /> <br />Phase A Report was accepted and the f()llo~ing (jl~cisions concerning the <br /> <br />implementation of Phase B were made by the DistJ:"ict. <br /> <br />1. Plan A was the best overall pl.an for lirainage improvements in <br /> <br /> <br />First Creek basin as agreed upon by all concerned partiesc <br /> <br />2. Each structure crossing t.he First Crt~~?k drainageway was de- <br /> <br /> <br />s igned to accommodate the 100-yea r Hows wi thoul. damage c This 'was ac- <br /> <br /> <br />complished by one of the following methods <br /> <br />a. Where practical, st.l::-ucLures v,'(:,rp designed to pass the 10- <br /> <br />year flows with structural protection for the 100-year flows. <br /> <br />b. Waterway for railroad ~nd rna(lway crossings downstream of <br /> <br /> <br />Station 221+00 were designed to pass the lOO-year flows under <br /> <br /> <br />pressure flow conditions without overtoppingc The Buckley Road <br /> <br /> <br />crossing was also designed for LOO-rear fLowc <br /> <br />3. Improved channel sectiO[lS Wl"re deslgned to conL1.in the 100- <br /> <br /> <br />year flows, with adequate rip rap protect.ion provided wherever n.ece:~sary <br /> <br /> <br />for the reach downstream of O'Brian CanaL to Highway 85 and in the Foul- <br /> <br /> <br />ton Ditch reach_ <br /> <br />After r.eceipt of the notice to p:coc.2ed 1,-littl Phase B 7 the following <br /> <br /> <br />plan of approach was formulated for compLeting the Phase B work: <br /> <br />1. Update and finalize hydr~ology )rE_'pklred in Phase A. <br /> <br />2. Prepare design criteria to be 'lsed in Phase B. <br /> <br />3. Perform hydraulic computati ons and de t.ermine discharge capa- <br />city of all structures crossing t.he dra'Lnaf,e\l!ay. <br /> <br />4. Prepare layouts, reach by rt~acJIJ of' possible channel and <br /> <br /> <br />structural improvements using costs of improvements as a guide. <br /> <br />II-I <br />