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