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. . . 9. The spilled water traveled in a southeasterly direction and ended up in Weldona (trapped behind the highway and railroad embankments). . Flood flows from Schaefer Draw breached through the Riverside Canal and the Weldon Valley Ditch. The flows entered Weldona mainly from the west side of County Road 9. Proposed Mitigation Alternatives . Alternative 1: The County staff and the landowner are very interested in building a diversion levee/channel along the north side of Weldona. The levee/channel would direct overland flows to the west and to the east of the community. The high point of the levee/channel system would be located near the high school. Existing drain tiles in the area would need to be preserved if channels are constructed to direct the flows to the south (exact locations and depths of drain tiles are unknown at this time). . In conjunction with alternative 1, a new channel could be constructed from highway 144 due south to the South Platte River along Grove Road. The County staff estimated that the length of this channel would be 0.3 mile. Existing fann land would need to be purchased in order to gain right-of-way to build the channel. This option appears to be quite viable. . In conjunction with any alternative, new culverts could be constructed under highway 144 just west of County Road 9. CR 9 could be raised 1 to 2 feet from hwy 144 to the north (approximately 200 feet). This improvement would divert flows from the west of CR 9 and north of hwy 144 to the ditch along the south side of hwy 144. The existing property/abandoned house located on the northwest comer of highway 144 and County Road 9 should be acquired. This property is in a low-lying area and receives frequent nuisance flooding. It is also located in the backwater area for the proposed culverts. . Alternative 2: A new reservoir could be constructed just downstream of the existing reservoir below the Riverside Canal. The new reservoir would capture the lOO-year runoff from Schaefer Draw, and would have a spillway that could pass up to the 100-year flow. If the reservoir outflow was designed to be quite small, then it could drain into the existing downstream flow paths. A large reservoir outflow would require a downstream conveyance system or a levee on the north side of We Idona. . In conjunction with any alternative, spill structures on the Riverside Canal and the Weldon Valley Ditch need to be constructed to prevent future bank failures. Miscellaneous . Acquisition costs for fann land were estimated to be $1,500 to $3,000 per acre. -.~- ~- - -- --- -