Recycling green waste
All grass clippings, spent annuals from garden beds, material left over after clipping, pruning and hedging are composted. To this compost heap is added any good soil that may be left over from construction work around the Parkland. The compost heap is turned regularly using a large excavator because of the quantities involved. When ready the compost produces a very healthy, organically rich soil which is used on the garden beds. Composting produces enough soil for the Parkland and eliminates the need for purchasing soil from external sources.
Water quality in the lake
The Parkland has been designed so that all storm water flows down into the lake, maximising rain water capture in the Parkland. Silt traps have been installed at strategic points in storm water drains so that most of the silt and other rubbish is collected before the water enters the lake.
Four areas of wetlands have been constructed around the lake. These also help capture silt before rain water run-off from the Parkland enters the lake. Aquatic plants that have been planted in the wetlands and help control the amount of nutrients entering the lake. A regular monthly laboratory check of lake water is done so that water quality is monitored to ensure that no toxicities or excess algae build up in the water.
The Parkland’s resident ducks occasionally bring in seed from infected waters, causing outbreaks of aquatic weeds such as Duck Weed, Salvinia and Water Hyacinth. Rather than controlling these weeds with chemicals, Parkland Staff net them out physically and add them to the compost heap.
The lake has been stocked with seven different species of fish native to the Brisbane area. These help in controlling algae and other weeds.
Mulching is important in any garden situation mulch is regularly applied to the Parkland gardens and tree surrounds. Mulching assists in plant growth by:
- reducing weeds, in turn reducing the use of labour and chemicals to control weeds
- controlling erosion, preventing soil washing into creeks and rivers
- adding humus to the soil as it breaks down, increasing the health of the soil over a period of time
- improving the texture of the soil as it breaks down over a period of time;
- adding nutrition to the soil, and assisting in ‘holding’ nutrients that are applied as fertilisers, increasing the health and vigour of plants
- controlling the temperature of the soil, keeping the soil cooler in summer and warmer in winter, assisting plant growth
- helping the soil in absorbing and ‘holding’ water, which the plants can then use.
Irrigation in the Parkland has been converted to the use of lake water only, thus conserving town water. Irrigation occurs mostly at night which means a reduction in loss of water from evaporation. There is then a greater length of time for more of the water to actually percolate deeper into the soil before a part of it is evaporated by the direct action of the sun.
Following the introduction of water restrictions into South East Queensland, Roma Street Parkland has implemented a water management strategy. For more information, download the water management fact sheet.
Last updated 09 April 2009