Mesa County contains a large percentage of agricultural lands, thus the interaction of storm runoff systems and agricultural irrigation structures is common, especially for new developments. It is common for a storm drainage system to encounter irrigation ditches, canals, or even conduits, especially in agricultural areas. Further, the designer/engineer is cautioned to verify that damage to downstream properties will not occur by bypassing of storm runoff. Only after a thorough review and understanding of this chapter, and with coordination with the parties involved, shall the user proceed with the specific tasks that need to be performed. It is recommended that the designer/engineer, when faced with a specific irrigation/drainage structures interface, to review in detail GJMC 28.16.200 through 28.16.230. As a result, the traditional practice of utilizing irrigation ditches, drains, and reservoirs for stormwater control must be reexamined on a case-by-case basis. In addition, water quality of the runoff is often adversely impacted by this urbanization. However, the development (urbanization) of these areas results in storm runoff of much higher peak flows and larger total volumes. 28.52.010 Introduction.Ī large number of agricultural irrigation facilities exist in Mesa County, and many have historically intercepted runoff from rural and agricultural areas with little consequence. 28.52.020 Irrigation ditch crossings (cross-drainage structures).Ģ8.52.040 Overchutes (flumes and pipe overchutes).
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