Senior Science Revision
Water Pollution
Today we are going to investigate how much water pollution which comes from School could eventually end up in the local rivers, creeks, wetland or groundwater.
The first thing we need to do is estimate how much water falls on the school, and which surfaces it falls on (e.g. roof, paths, car parks, grass).
Task 1: Placing the school catchment
Using the map of the Manly Council, locate School.
Pittwater House is in the catchment area of ________________________.
The water run-off through stormwater drains enters the Narrabeen Lagoon.
Task 2: Mapping the School
You need to measure an area of the school grounds. You have been given a map of the school. Choose an area of the school you wish to measure. Example, the Science block, tennis court etc. Go outside and measure distance. Compare to size on map to develop a scale.
For example, the Pool is 25m long and is 2cm on the map. Therefore every 1cm on the map = 12.5m.
You then need to record:
• Total area of the school
• Area of:
Buildings
Paths / Paved areas
Car parks
Grass
Garden beds
Sand pits (play grounds)
Task 3: Calculating the amount of water falling on School.
One millimetre of rainfall per one square meter of area = one litre of water.
Go to The Bureau of Meterology and determine the average annual rainfall for Dee Why. www.bom.gov.au Using calculated total area of the school and the rainfall data. Calculate how many litres of water pass through the school grounds each year.
For example, if your school grounds are 500 m long by 300m wide (assuming it is totally flat), the total amount of water falling on your school in one year is: 300 x 500 x 835 = 125 250 000 litres.
You now need to calculate how much rain lands on each surface of the school.
Rainfall landing on vegetation will be absorbed.
To work out how many litres of water fall on each type of area multiply the total amount of water by the proportion for that area eg. if 25% of the grounds are
Today we are going to investigate how much water pollution which comes from School could eventually end up in the local rivers, creeks, wetland or groundwater.
The first thing we need to do is estimate how much water falls on the school, and which surfaces it falls on (e.g. roof, paths, car parks, grass).
Task 1: Placing the school catchment
Using the map of the Manly Council, locate School.
Pittwater House is in the catchment area of ________________________.
The water run-off through stormwater drains enters the Narrabeen Lagoon.
Task 2: Mapping the School
You need to measure an area of the school grounds. You have been given a map of the school. Choose an area of the school you wish to measure. Example, the Science block, tennis court etc. Go outside and measure distance. Compare to size on map to develop a scale.
For example, the Pool is 25m long and is 2cm on the map. Therefore every 1cm on the map = 12.5m.
You then need to record:
• Total area of the school
• Area of:
Buildings
Paths / Paved areas
Car parks
Grass
Garden beds
Sand pits (play grounds)
Task 3: Calculating the amount of water falling on School.
One millimetre of rainfall per one square meter of area = one litre of water.
Go to The Bureau of Meterology and determine the average annual rainfall for Dee Why. www.bom.gov.au Using calculated total area of the school and the rainfall data. Calculate how many litres of water pass through the school grounds each year.
For example, if your school grounds are 500 m long by 300m wide (assuming it is totally flat), the total amount of water falling on your school in one year is: 300 x 500 x 835 = 125 250 000 litres.
You now need to calculate how much rain lands on each surface of the school.
Rainfall landing on vegetation will be absorbed.
To work out how many litres of water fall on each type of area multiply the total amount of water by the proportion for that area eg. if 25% of the grounds are