CIMIS-11
.pdf
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School
California Polytechnic State University, San Luis Obispo *
*We aren’t endorsed by this school
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
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.
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