Engineered solutions to retrofit sustainable tree cover in urban areas to reduce flood risk and improve water quality. Incorporating best practice in: nutrient releasing soil technologies, urban drainage techniques and an ecological approach to species selection for location. Urban Catchment Forestry trials engineered solutions to retrofit large ecologically selected trees into hard urban areas, tree pits are designed to help reduce flood risk and to maximise water supply to the establishing tree. Soils used are trialled to maximise soil health and establishment and where necessary innovative designs will be trailed for root cages to ameliorate compaction. Trees are located to enhance the new urban green corridor. Urban Catchment forestry includes the installation of rain garden and includes the use of different Urban Drainage Techniques.