# 1-24 - BIE 5110/6110 Sprinkle Trickle Irrigation Fall...

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BIE 5110/6110 Sprinkle & Trickle Irrigation Fall Semester, 2004 Assignment #1 (100 pts) Due: 15 Sep 04 Given: Data for a field in Cache Valley, Utah: Crop= Sweet corn Topsoil= Sandy loam Topsoil depth (m)= 0.5 Subsoil= Silt Loam Subsoil depth (m)= 1.4 Field area (ha)= 25 MAD (%)= 35 Irrigation water salinity, EC w (dS/m)= 1.02 Application efficiency= 88% Soil intake rate (mm/hr)= 14 Time to change sets (hrs)= 0.5 Lateral length (m)= 180 Lateral spacing, S l (m)= 12 Weather data: 1. Go to http://climate.usu.edu/ 2. Click on "Utah Climate Center Data (Use Microsoft Explorer)" 3. Look at the instructions for selecting a region 4. Select a region which includes Utah 5. Click on the "Update Station List" button 6. At the upper left you see a list of stations 7. Click on the list and type "L" 8. Scroll down further to "logan usu exp stn" 9. Under "Element," select "Maximum Air Temperature" 10. Check the "Full period of record" box 11. Click on the "Export Data" button at the top 12. Click on the "Update Output" button at the lower left 13. Type "Ctrl-A" to select all, then "Ctrl-C" to copy 14. Paste it into Notepad or Word 15. Clean up the data and import to Excel 16. Go back and select “Minimum Air Temperature" and get that data 17. Go back and select “Total Precipitation" and get that data, too Note that values with “-99999,M” are missing. Required: Perform calculations to answer all of the questions as shown in the table format on the next page Show your steps in logical order, and write down your assumptions (if any) in determining the respective values Do you work neatly

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Notes: 1. Many years of weather data for Logan, Utah (Experiment Station site), are given on the web site. 2. Determine the mean monthly values (Jan – Dec) of maximum daily air temperature for the entire period of record (about 34 years). To do this in Excel, you may want to use functions like COUNTIF and SUMIF. 3. Plot the mean monthly values of maximum air temperature and determine which month is the warmest; this month will be used below as the peak-use (peak ET) month. 4. Use the precipitation data to calculate the 75% rainfall probability value for the peak-use month to determine the net crop ET requirement during that month. This means you need to calculate the total rainfall (inches) for the peak-use month for the 34 years of record. You can consider that the 75% rainfall value is all “effective” rainfall for that particular month. 5. You may notice some problems with the data sets from the Utah Climate Center web site. Document these problems and describe how you have dealt with them.
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## This note was uploaded on 03/01/2012 for the course BIE 6110 taught by Professor Sprinkle during the Fall '03 term at Utah State University.

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1-24 - BIE 5110/6110 Sprinkle Trickle Irrigation Fall...

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