Changes

Jump to navigation Jump to search
→‎Seasonal Dams: added inflatable dam, pushup diversion photos
Line 72: Line 72:  
Seasonal dams are temporary structures that can be erected to store water for immediate or later diversion, or removed to allow flows and (in most cases) fish to pass. Inflatable dams and flashboard dams (also known as stop log dams) are the most common types of seasonal dams. When in operation, both types of dams raise the river level allowing water to be diverted through a channel or pipe.
 
Seasonal dams are temporary structures that can be erected to store water for immediate or later diversion, or removed to allow flows and (in most cases) fish to pass. Inflatable dams and flashboard dams (also known as stop log dams) are the most common types of seasonal dams. When in operation, both types of dams raise the river level allowing water to be diverted through a channel or pipe.
    +
[[Image:Inflated_dam_alameda_crk.JPG|thumb|right|Inflated Dam on Alameda Creek (Alameda Flood Control and Water Conservation District)]]
 +
[[Image:Deflated_dam_alameda_crk.JPG|thumb|right|Deflated Dam on Alameda Creek (Alameda Flood Control and Water Conservation District)]]
 
===Inflatable dams===
 
===Inflatable dams===
 
Inflatable dams are made of thick, laminated rubber and nylon tubes that are anchored to a concrete foundation across the streambed. The tube can be filled automatically or manually with air or water to create a barrier, and subsequently deflated to lie flat on the foundation (see photo). The inflatable tubes usually last between 25 and 50 years.
 
Inflatable dams are made of thick, laminated rubber and nylon tubes that are anchored to a concrete foundation across the streambed. The tube can be filled automatically or manually with air or water to create a barrier, and subsequently deflated to lie flat on the foundation (see photo). The inflatable tubes usually last between 25 and 50 years.
Line 95: Line 97:  
*“Rubber Dam Hydraulics: Hydraulic Design of Inflatable Flexible Membrane Dams.” University of Queensland, Australia, http://www.uq.edu.au/~e2hchans/rubber.html
 
*“Rubber Dam Hydraulics: Hydraulic Design of Inflatable Flexible Membrane Dams.” University of Queensland, Australia, http://www.uq.edu.au/~e2hchans/rubber.html
    +
[[Image:Pushup_diversion.JPG|thumb|right|Site of a Former Irrigation Push-up Dam Replace with an Alternative Diversion Structure (Applegate River Watershed Council)]]
 
===Consolidated Diversions===
 
===Consolidated Diversions===
 
It is not uncommon for diverters to locate several diversion dams close together on a single stream. In certain cases, it is possible to consolidate the number of diversions to a single diversion point, allowing the elimination of some of the dams.
 
It is not uncommon for diverters to locate several diversion dams close together on a single stream. In certain cases, it is possible to consolidate the number of diversions to a single diversion point, allowing the elimination of some of the dams.

Navigation menu