Soil Analysis Before and 5 Years after Recycled Water Irrigation

摘要

To ensure sustainable and affordable water supplies, Denver Water operates a recycled water system that treats and delivers recycled water for landscape irrigation and other non-potable purposes. Water reuse for irrigating landscapes is one of the approaches to maximize the existing water resources and stretch current urban water supplies. Phase one Denver Water's recycled water system provides recycled water to ten separate sites,including five parks, three golf courses, one school ground, and one zoo. In 2004,soil baseline information was collected by Colorado State University (CSU) for these 10 sites that just started to use recycled water for landscape irrigation. In September to October 2009,five years after the initiation of recycled water for irrigation, CSU collected and tested soils again from the original sites to determine if any changes had occurred. This paper summarizes the study results and includes recommendations for managing landscapes that are irrigated by recycled water.