1. 355.T1 Model Agricultural Core Curriculum: Supplement University of California, Davis Irrigation Practices Sources of Irrigation Water The majority of irrigation water comes from surface water. The main sources of surface water are snow run- off or rainfall that has been stored in dams and aqueducts. A distribution system of canals, ditches, and pipelines delivers the water to the individual farm.

2. 355.T2 Model Agricultural Core Curriculum: Supplement University of California, Davis Irrigation Practices Water Quality Water quality can be affected by: –The presence of salts [NaCl]. –The presence of boron –Organic matter and other suspended solids (Algae, fungi, plant material).

3. 355.T3 Model Agricultural Core Curriculum: Supplement University of California, Davis Irrigation Practices Benefits of Proper Soil Drainage Soil aeration, microbial activity, and fertilizer efficiency are improved. Soil volume may be increased. Salts are flushed from the soil. Water table may be lowered which will promote roots to penetrate deeply.