CIMIS-11
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School
California Polytechnic State University, San Luis Obispo *
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Course
340
Subject
Information Systems
Date
May 26, 2024
Type
Pages
11
Uploaded by Durantfuller
BRAE 340 Page -1 BRAE 340 - Irrigation Water Management California Irrigation Management Information System CIMIS Name: Date: BRAE 340 Lab: Day: ____________ Time: ___________ Section #: ________ Names of Others in Your Discussion Group: ______________________________________ ______________________________________ ______________________________________ ______________________________________ ______________________________________ ______________________________________
BRAE 340 Page -2 BRAE 340 - Irrigation Water Management California Irrigation Management Information System Introduction
: The goal of this lab is to introduce you to the California Irrigation Management Information System (CIMIS), to have you access some of the CIMIS weather data available from the Internet, and to show you how CIMIS information can be useful in irrigation scheduling decisions. The lab will be conducted in 2 parts. Part I:
Following the instructions below, access CIMIS weather data via the internet. All ET
o
data must be in inches per day or inches per month. Based on the information provided on the CIMIS web page, answer some questions about the CIMIS program. Graph the ET
o
on a daily basis.
Part II:
Combine weather data with crop coefficient data for the crops identified in the lab to make estimates of ET
c
, crop evapotranspiration. Complete the lab by using ET
c
to make irrigation scheduling decisions. Graph the differences between location and crops.
Lab Report
: • Cover Page
• Part I: Data Collection and Analysis • Part I: Questions
• Part I: Alternate Sources of Weather Data
• Part II: Calculations, Graphs and Questions
Grades
: • Part I, 55% ET
o
for past 12 months and past 14 days Normal year ET
o Plot the data Questions Q1-Q6 • Part II, 45% Graph of crop coefficient for given crop One crop in three locations Three crops in one location Plot the data Question Q1-Q4
BRAE 340 Page -3 Part I: Internet Access to CIMIS Weather Data 1a. Access CIMIS via the Internet. The main CIMIS page is located at: http://www.cimis.water.ca.gov/ As new users, click on the “Register” button
at the top right of the screen. Create an account. Once registered, you can log in and obtain the data needed to complete the lab. It is free to register.
1b. Get recent CIMIS data. For the following two sites, from two climatic regions, determine reference evapotranspiration, ET
o
, for the last 14 days (first table) and for the last 12 months (second table). ET
o
for the last 14 days will be in inches/day. ET
o
for the last 12 months will be in inches/month. To determine the average daily ET
o
, convert the monthly reading to inches/day by dividing it by the number of days in the month (this is needed for the first table). Coastal Region Palmdale San Luis Obispo County Los Angeles County #52 San Luis Obispo #197 Palmdale After logging in to the main CIMIS page, click on the “
DATA
”
tab (near the top and center of the page). For Step #1, create “a
Daily
”
“PDF Report”
in English Units for your timeframe. For Step #2, locate the station of interest
in the list and select it. You don’t need to check anything for Step #3.
Record the ET
o
data in the correct column for each station. To determine the Ave Daily valves, select the
“
Monthly Average ET
o
”
report for each station. Take the current month’s
value and divide it by the number of days in this month. You can also use the
“
Daily ET
o
Variance”
report to find the historical average by day. (
10 pts
) Coastal Region Palmdale San Luis Obispo County Los Angeles County #52 San Luis Obispo #197 Palmdale May 1- 14 2024 Ave Daily for May May 1- 14 2024 Ave Daily for May Day in/day in/day Day in/day in/day 1-May 1-May 2-May 2-May 3-May 3-May 4-May 4-May 5-May 5-May 6-May 6-May 7-May 7-May 8-May 8-May 9-May 9-May 10-May 10-May 11-May 11-May 12-May 12-May 13-May 13-May 14-May 14-May
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BRAE 340 Page -4 1c. Average Year Data. To determine the monthly ET, select “
a Monthly”
PDF Report for Step #1. Enter the months that you wish to get data for and find your station of interest. Because this month is not finished, you will need to use data from the previous year
. For these same two stations, obtain the “Average Year”
or “Normal Year”
by creating “
a Monthly average ET
o
” report. Select the desired station and record the average monthly reference evapotranspiration (ET
o
) in the table below. Sum up the ET
o
values for each station. (
10 pts
)
Coastal Region Palmdale San Luis Obispo County Los Angeles County #52 San Luis Obispo #197 Palmdale Last 12 Months Normal Year Last 12 Months Normal Year Month in/month in/month Month in/month in/month Jan Jan Feb Feb Mar Mar Apr Apr May May June June July July Aug Aug Sep Sep Oct Oct Nov Nov Dec Dec Totals Totals Comment on the comparison of the values ET
o
for the past 14 days/12 months compare
d to “normal” or
“
average
”
year. How well do they compare? What might explain the differences? (
5 pts
)
1d.
Variation in Yearly Weather. For both stations, plot the daily ET
o
for: a. The past 14 days. b. Daily Average ET
o
for a “Normal Year”
in October (should basically be a straight line). Label each line graphed and both the horizontal and vertical axis
. Include the units.
BRAE 340 Page -5 (
6 pts
)
PART I –
Questions (
4 pts each
)
Q1.
What height above the ground surface should these sensors be located? Find them on the CIMIS page. Include units. Wind Speed: _____________________ Rain Gauge: ______________________ Q2. (a) Bare soil instead of cropped land around the weather station will ____________________ (increase, decrease?) temperatures and ___________________ (increase, decrease?) humidity, which will ____________________ (increase, decrease?) the ETo value. (b) Paved roads should be no closer than ____________ yards from the CIMIS station. Q3.
(a) What make/model is the Relative Humidity sensor? (b) What accuracy does it have?
BRAE 340 Page -6 Q4.
(a) What height should the turf below the CIMIS station be maintained to provide good readings? Why do you think this is the case? (b). What version of the ET
o
equation does CIMIS use? Q5.
What are the 4 primary factors affecting ET
o
? 1 __________________________ 2 _________________________ 3 __________________________ 4 _________________________ Q6.
(a) Write the equation for converting reference evapotranspiration (ET
o
) values to crop evapotranspiration (ET
c
) values. (b) CIMIS uses hourly weather data to calculate hourly ETo and then ______________ (averages or sums/totals?) them over 24 hours (midnight to midnight) to estimate daily ETo.
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BRAE 340 Page -7 Part II: Estimation of Crop Evapotranspiration (ET
c
) & Irrigation Scheduling
2a.
Crop Coefficients. For the calculations in the remaining portions of this lab, use the crop coefficients tabulated below. These crop coefficients have been derived for use with the grass reference
crop used by CIMIS. Crop Coefficients - Kc
(for use with Grass Reference ET
o
) Deciduous Orchards Without With Grape Small Month Alfalfa Cotton Citrus Cover Crop Vines Grains Jan 1.06 - 0.84 - 0.99 - 0.59 Feb 1.01 - 0.77 - 1.00 - 1.01 Mar 0.99 - 0.74 0.48 1.06 0.02 1.25 Apr 0.98 0.09 0.72 0.69 1.12 0.22 1.22 May 0.97 0.30 0.70 0.82 1.19 0.61 0.92 Jun 0.96 0.87 0.66 0.89 1.19 0.78 0.08 Jul 0.98 1.27 0.66 0.96 1.21 0.85 - Aug 0.99 1.23 0.66 0.96 1.18 0.84 - Sep 1.01 0.89 0.70 0.96 1.16 0.65 - Oct 1.03 0.21 0.72 0.81 1.04 0.33 - Nov 1.06 - 0.78 0.64 1.04 0.09 - Dec 1.09 - 0.69 - 0.91 - 0.16 2b.
Complete the graph. Plot the crop coefficient for Grape Vines
. (
3 pts
)
BRAE 340 Page -8 2c.
Determine the effect of climate on crop ET
c.
Calculate the normal year ET
c
for Cotton
at three locations (three climate regions). (
8 pts
) 2d.
Plot ETc. Using the results from above, plot the same crop at the three different locations. Label all 3 curves clearly. (
5 pts
) ET
o
ET
c
ET
o
ET
c
ET
o
ET
c
Month
K
c
(in/day)
(in/day)
(in/day)
(in/day)
(in/day)
(in/day)
Jan
0.08
0.04
0.04
Feb
0.12
0.07
0.07
Mar
0.17
0.12
0.12
Apr
0.23
0.17
0.17
May
0.28
0.23
0.23
Jun
0.30
0.25
0.27
Jul
0.29
0.25
0.27
Aug
0.27
0.23
0.25
Sep
0.23
0.18
0.19
Oct
0.16
0.11
0.12
Nov
0.10
0.06
0.06
Dec
0.07
0.04
0.03
Merced
Normal Year ETc for Cotton at 3 Locations
Region:
Imperial Valley
San Joaquin Valley
San Joaquin Valley
County:
Imperial
Tulare
Merced
Location:
Calipat
Delano
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
1
2
3
4
5
6
7
8
9
10
11
12
ETc
Month
ET
c
for ____________ at 3 Locations
Calipat
Delano
Merced
BRAE 340 Page -9 2e.
Explore the variation in crop ET at one location. Determine the ET for three different crops by calculating the normal year ET
c
in San Luis Obispo, CA
. Use the K
c
values from the table in 2a.
(
8 pts
)
2f.
Plot the ET
c
for three different crops at the same location. Label all 3 curves clearly. (
5 pts
)
ET
o
ET
c
ET
c
ET
c
Month
(in/day)
K
c
(in/day)
K
c
(in/day)
K
c
(in/day)
Jan
0.04
Feb
0.08
Mar
0.14
Apr
0.20
May
0.26
Jun
0.29
Jul
0.29
Aug
0.26
Sep
0.21
Oct
0.14
Nov
0.07
Dec
0.04
Normal Year ETc for 3 Crops in San Luis Obispo, California
Crop:
Grape Vines
Orchard w/o Cover
Small Grains
0.00
0.05
0.10
0.15
0.20
0.25
0.30
1
2
3
4
5
6
7
8
9
10
11
12
ETc
Month
ET
c
for 3 crops in _____________
Grape Vines
Orchard w/o Cover
Small Grains
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BRAE 340 Page -10 PART II –
Questions
(
4 pts each
)
Q1.
Suppose the farm manager has decided to allow 3.40 inches depletion
(total for the entire root zone) before irrigation. How many days can be allowed between irrigations during a month when: (a) Month April, K
c
= 0.71 ET
o averages 0.16 in/day (b) Month of July, Same Crop, K
c
= 1.05 ET
o
averages 0.25 in/day Q2.
True of False. The values found on the ITRC website are ETo values. Explain. Q3.
Crop coefficients (K
c
): a)
What device is used to determine the actual ET (ET
c
) of specific crops? These values can then be used to determine the K
c
values for that crop. How does the device work? b)
True or False. Kc values are NOT transferable. Therefore, you would need to use a different Kc value for citrus in Florida compared to California. Explain.
BRAE 340 Page -11 Q4.
Explain the primary differences between the graphs of 2d and 2f. What do the graphs demonstrate?