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Investigation of natural sealing effects in irrigation canals. Research technical completion report, project A-023-IDA Item Info

Results of a three year study on the factors contributing to natural sealing of irrigation canals and reservoirs are presented. Laboratory evaluations of the effect of sedimentation, microbiological activity and soil-water chemical reactions on the hydraulic conductivity of soils were performed. Particular emphasis was on the Portneuf silt-loam soil of southern Idaho. Techniques for determining and predicting the sediment entrapment in soils from hydraulic conductivity measurements in laboratory columns are presented. Application of a method utilizing soil clay content, exchangeable sodium percentage, and total salt concentration of irrigation water to predict hydraulic conductivity is evaluated. The effect of microbiological activity in the benthic area of canals and reservoirs on seepage rates is discussed. Field tests in an operating canal to monitor soil moisture tension, soil moisture and seepage rates during an irrigation season are outlined. Long term reducation in seepage rates of canals constructed in siltloam soils is due to the formation of an impeding layer on the canal bottom due primarily to sedimentation. Seasonal changes are predominantly affected by microbiological activity in the impeding layer.

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Title:
Investigation of natural sealing effects in irrigation canals. Research technical completion report, project A-023-IDA
Authors:
Brockway, C. E.
Date Created (ISO Standard):
1973-05
Description:
Results of a three year study on the factors contributing to natural sealing of irrigation canals and reservoirs are presented. Laboratory evaluations of the effect of sedimentation, microbiological activity and soil-water chemical reactions on the hydraulic conductivity of soils were performed. Particular emphasis was on the Portneuf silt-loam soil of southern Idaho. Techniques for determining and predicting the sediment entrapment in soils from hydraulic conductivity measurements in laboratory columns are presented. Application of a method utilizing soil clay content, exchangeable sodium percentage, and total salt concentration of irrigation water to predict hydraulic conductivity is evaluated. The effect of microbiological activity in the benthic area of canals and reservoirs on seepage rates is discussed. Field tests in an operating canal to monitor soil moisture tension, soil moisture and seepage rates during an irrigation season are outlined. Long term reducation in seepage rates of canals constructed in siltloam soils is due to the formation of an impeding layer on the canal bottom due primarily to sedimentation. Seasonal changes are predominantly affected by microbiological activity in the impeding layer.
Subjects:
canal seepage sediment seepage control
Collection:
IWRRI
IWRRI number:
197305
Rights:
Rights to the digital resource are held by the University of Idaho. http://www.uidaho.edu/
Publisher:
University of Idaho
Contributing Institution:
University of Idaho
Type:
Text
Format:
application/pdf
Cataloger:
wbv
Date Digitized:
2012

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Preferred Citation:
"Investigation of natural sealing effects in irrigation canals. Research technical completion report, project A-023-IDA", Idaho Waters Digital Library, University of Idaho Library Digital Collections, https://www.lib.uidaho.edu/digital/iwdl/items/iwdl-brockway_1973.html
Rights
Rights:
Rights to the digital resource are held by the University of Idaho. http://www.uidaho.edu/
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