#Concrete flume with energy dissipators install

This infers pressure pipe flow, with successful operation being dependent on sufficient head at the upstream end to overcome the rise as well as pipe losses in the siphon section. Sometimes called “sag pipes,” the conduit drops to an invert low enough to pass under the obstruction then rises to the channel invert at the downstream end.

(a) An inverted siphon consists of a closed conduit used to convey water under an obstruction such as an irrigation structure or roadway where the use of a continuous-slope conduit would interfere with said obstruction. Overchutes include both flumes and pipe overchutes for the conveyance of stormwater over another channel. Two methods for completing this task are presented in GJMC 28.52.030 and 28.52.040: inverted siphons and overchutes. Otherwise, stormwater flow shall be kept separate from irrigation conveyances as reasonably possible. In certain (rare) cases, it is allowable for stormwater flow to enter an irrigation canal and then be removed (see side-channel spillways in GJMC 28.36.120) at another location. In locations where stormwater flow is in an open channel or relatively shallow pipe at an intersection with an irrigation structure, other options must be considered. Where the invert of a drainage channel is low enough in relation to the irrigation structure, it may be possible to utilize a standard culvert design for the crossing (see Chapter 28.48 GJMC).

#Concrete flume with energy dissipators install

However, it may occasionally be necessary to install storm drain pipe by boring or jacking to avoid disruption of the irrigation flow. Storm drains are often buried with sufficient cover to completely avoid an interaction with existing irrigation structures. 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).