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proposed channel section is about 300 ft. wide at the top (See Figure 8). The <br />modifications to Ditch Segments 7 and 21 provide approximately 4.80 ac-ft. of <br />additional storage. <br />3) Ditch Segment 122 and 129 (Roadside ditch along Farrington Road) — These <br />ditch segments were proposed to expand to function as a linear detention (See <br />Figure 10). The expansion will provide approximately 3.6 ac-ft. of storage. The <br />culvert structures 118 and 166 are proposed to replace with 2-42" pipes. <br />The overall drainage improvement work will result in about 15 ac-ft. of dirt excavation <br />for both the linear detention and conveyance improvement, of which approximately <br />11 ac-ft. will be utilized for detention purposes. The excess improvement will result in <br />conveyance improvements to the system. <br />Une r Detention, Ditch Segment 21 <br />12 <br />?31 <br />22 <br />m <br />y ? 'k <br />StAKuc)r� (ft) <br />FIGURE 8 - LINEAR DETENTION GEOMETRY <br />Other modifications to the ditch system include: <br />1) The ditch segments 17, 19, 20, 26 and 148 were lowered with minimal changes <br />to bottom width or side slopes. <br />Page 126 <br />