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<br />Existing Drainage Facilities <br /> <br />The existing drainage facilities within the Town <br />of Ordway are shown on Figure 2. Several existing open <br />channels are being utilized for stormwater conveyance. <br />The largest drainage facility is the Town of Ordway <br />Ditch, which is aligned along the eastern right-of-way <br />of Colorado Highway 71. This ditch extends <br />approximately 1.0 miles north from the railroad grade to <br />11th Street. This channel is operated and maintained by <br />the Town of Ordway Ditch Company. The cost for this <br />service is assessed to the Town on an annual basis, and <br />according to the cost for the work accomplished in that <br />same year_ This facility was assumed to have a <br />perpetual use for stormwater only. <br /> <br />Irrigation laterals and subsurface drains exist <br />within several areas of the Town. Although functional, <br />these facilities offer little ~r no stormwater <br />conveyance. Sub-drain and irrigation systems have been <br />known to aggravate minor flooding and cause <br />deterioration to drainage facilities which eventually <br />receive groundwater or irrigation return flows. During <br />the hydraulic analysis, irrigation and subdrains were <br />assumed to be full at the time of a flood event. <br /> <br />Three improved open channels convey natural <br />drainage from the Town south to Lake Meredith. The <br />Central basin, drained by an existing four-by-five foot <br />concrete box culvert under the railroad and Colorado <br />Highway 96, outfalls in a poorly defined swale of <br />inadequate hydraulic capacity. This drainageway is <br />aligned north-south and passes near the Town's airport. <br />This flow path will need reconstruction to ensure a safe <br />conveyance of drainage to Bob Creek and Lake Meredith. <br /> <br />3 <br />