In Room24 we studied the Ayr street reserve. Thankfully, it was extremely easy for me because i just happen to live on Ayr St, so i didnt have to go very far for the answer (Not very far being the kitchen in my house where my mum was).
Our job was to interview somone on what the water was like in the reserve in the 1960's. Again it was easy for me because both my mum and my grandmother live on Ayr street in that time. this is how it went:
Me: What was the water like in the 60's?
Mum: Pretty clean, 9/10.
Me: Was the water drinkable back then?
Me: Would you swim in it?
Mum: I didnt, but it would be clean enough to swim in.
Me: How would you compare the cleanness (Yes that is a word) in the 60's to now?
Mum Now it is quite pllouted, probably 4/10... i wouldnt swim in it or drink it.
Me: Was there a vast range of wild life around the reserve? e.g plants, insects?