WSP09842

• File Number: 8273.600.30
• Description: Colorado River Basin Salinity Control - Federal Agencies - USDA
• Basin: Colorado Mainstem
• Water Division: 5
• Date: 1/1/1991
• Title: The Economics and Management of Water and Drainage in Agriculture
• Water Supply Pro - Doc Type: Report/Study

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APPROACHES TO DRAlNAGE PROBLEMS

Table 2. Results of simulation under cond~ions of Strategy II: Drainage
from bean, alfalfa and wheat crops used to irrigate cotton; drainage
water from ccitton discharged back to the river.'

%/055
Crop EC. V EC. V"", EC,. inyie/d
,. ,.
1st project (Volume of river = 500; EC = 05,) dS/m)
beans 0.50, 31.25 ,64 6.25 2.50 0
alfalfa 0.50 44.44 .94 4.44 5.00 0
wheat 0.50 31.25 .64 6.25 2.50 0
colton 3.15 ' (16.94)' 4.76 (2.54) 21.0 0
2nd project (Volume of river = 395.6; EC = 0.632 dS/m)
beans 0.63 31.25 .81 6.25 3.15 0
alfalfa 0.63 44.44 1.18 4.44 6.30 0
wheat 0.63 31.25 .81 6.25 3.15 0
COltOn 3.98' (16.94)' 5.99 (2.54) 26.5 0
3rd project (Volume of river = 291.2; EC = 0.858 dS/m)
beans .86 31.25 1.11 6.25 4.30 2
alfalfa .86 44.44 1.62 4.44 8.60 0
wheat .86 31.25 1.11 6.25 4.30 0
colton 5.43' (16.94)' 8.19 (2.54) 36.2 2
4th project (Volume of river = 186.8; EC = 1.338 dS/m)
beans 1.34 31.25 1.73 6.25 6.70 15
alfalfa 1.34 44.44 2.52 4.44 13.40 5
wheat 1.34 31.25 1.73 6.25 6.70 0
COlton 8.46' (16.94)' 12.76 (2.54) 56.4 2
(remaining volume of river = 82.4; EC = 3.03 dS/m)

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.Volume diverted from river for irrigation in each project = 106.94 units; volume of
drainage returned to river from each projccE = 2...54 unils.
brJ'be weighled average EC or Ihe drainage Walc~ from the bean, alfalfa and
wheal crops.
C'fhe cumulacive volume of the drainage walen from the bean, alfalfa and
wheal crops.