Water Use
Budget think money
• Income• How much money you make
• Outgo• How much money you spend
• Surplus• Extra: more income than outgo
• Deficit• Missing: more outgo than income
Budget think water• Income• How much water do we get
• Outgo• How much water do you use
• Surplus• Extra: more income than outgo
• Deficit• Missing: more outgo than income
Income Outgo• Where does the water come from?
• Is there a time of the year when we gets lots of water?
• Where does the water go?
• Is there a time of the year when we use lots of water?
Water Budget
•Surplus:•More income than outgo• During rainy season, lots of rain
and humidity• During winter, not much
evaporation or transpiration
•Deficit:•More outgo than income• During dry season, lots of
evaporation• During summer, lots of plants
Where is most of the water?
Who uses most of the water?
Our water use
Jan Feb Mar Apr May Jun Jul Aug Sept Oct Nov Dec
Income (mm)
80 70 135 180 80 50 35 90 88 75 73 85
Outgo (mm)
25 18 25 155 125 75 100 80 40 75 75 60
Surplus (mm)
Deficit (mm)
Make a graph of the water budget