Irrig Sys Class HO

Irrig Sys Class HO - BRAE 340 - Irrigation Water Management...

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BRAE 340 - Irrigation Water Management Irrigation Systems Irrigated Area in California ± Approximately 9.6 million irrigated acres in California ( Source: Kansas State Univ. 2003; www.oznet.ksu.edu) o Surface Irrigation ~ 53 % o Sprinkler Irrigation ~ 29 % o Drip/Micro Irrigation ~ 17% o Subirrigation ~ less than 1% Irrigation in California by System Type and Crop (ITRC, 2002) Categorization of Irrigation System Types ± Low/No Pressure Irrigation Systems o Surface o Subirrigation ± Pressurized Irrigation Systems o Sprinkler o Microirrigation Irrigation Nationwide (Source: Kansas State Univ. 2003; www.oznet.ksu.edu) ± Approximately 63.1 million irrigated acres in the USA (1998 data) o Surface Irrigation ~ 28.5 million acres ~ 45 % o Sprinkler Irrigation ~ 31.5 million acres ~ 50 % o Microirrigation ~ 3.1 million acres ~ 5 % Trends Surface Irrigation Main Types - Furrows: Spiles, Siphons, Gated Pipe - Border Strip: Alfalfa valves, Siphons, Gated Pipe - Basin: Relatively high flow rates needed for level basin; Relatively large diversion structures with energy dissipaters Basic Concepts - Infiltration depends on: Wetted surface, Opportunity time (OT), and Infiltration characteristics
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Irrig Sys Class HO - BRAE 340 - Irrigation Water Management...

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