Todd County Middle School · OSEU 1 · Math1

Math: Calculating pivot irrigation water usage “Lesson Title” | OSEU 1: Lands & Environment Compelling How much water is pumped through a pivot irrigation system in one crop season? Question South Dakota Common Core State Standards for Mathematics: Standard 1: Make sense of problems and persevere in solving them. Standard 2: Construct viable arguments and critique the reasoning of others. Standards and Standard 4: Model with mathematics. Practices Standard 6: Attend to precision Standard 7: Look for and make use of structure. Standard 8: Look for and express regularity in repeated reasoning. Staging the What volume of water is pumped in one day through a 130 acre crop sprinkler water system? Question Supporting Question 1 Supporting Question 2 Supporting Question 3 What is the irrigation system water How much water is pumped each How much water is pumped in a 24- volume per minute for a typical high- hour of the day? hour day? pressure irrigation well? (900 gal/min) Formative Performance Task Formative Performance Task Formative Performance Task Convert gallons/min to gallons/hour. Convert gallons/hour to gallons/day Research pivot irrigation systems to find water usage on different crops and (900 gallon/min X 60 min/hour) (54,000gallons/hour X 24 hours/day) on different soil types. =54,000 gallons/hour =1,296,000 gallons/day Featured Sources Featured Sources Featured Sources “To Combat Scarcity, Increase Water- Use Efficiency in Agriculture” Nebraska department of agriculture Worldwatch Institute, March 1, 2013, By Sophie Wenzlau 80% of the fresh water withdrawn from rivers and groundwater is used for food and agricultural products. Agricultural sprinkler irrigation systems use 4 times as much Summative Argument water per day as drip systems. According to the UN Food and Agriculture Organization (FOA) 60% of the water diverted or pumped for irrigation is wasted via runoff into Performance waterways or evapotranspiration. Task Contact state extension agents for more information on improving irrigation system Extension water usage efficiency. Taking Informed Investigate drip irrigation systems for gardens and trees and present to class. Action