Composting is a great way to reduce food waste ending up in landfill, as up to half the waste thrown out by the average Australian household is organic matter.
A compost system or worm farm will take grass clippings and leaf matter from around the yard and prevent them from entering the creek. Using it to put on your garden is great as the nutrients will be used to grow veggies rather than growing algae and aquatic weeds in the creek.