In 2007 the State of California’s mandated reducing water usage by 20% before the year 2020. We have already met that goal. Now with the City's declaration of Drought Stage 2, which requires 20% reduction for households and a 30% reduction in irrigation for businesses, we continue to look for ways to be more efficient with our water resources in addition to the reductions that have already been achieved.
We do not have a set schedule for our irrigations systems. With 72 parks and facilities it would be very difficult due to usage demands. However, most of our street landscapes are consistent. Our irrigation schedules are largely based off of evapotranspiration rates (ET) and then programmed by staff to meet that need.
ET rates provide exactly the amount of water loss through plant use and evaporation. This is measured by staff using soil probes and calculated by plant types, in this case turf grass. So you may very well see several days of water in a row, as it is supplied incrementally to replenish what was lost. We reduce the percentage not the days of water based on ET to achieve our reduction. For example, if the ET called for 1 gallon, we are only giving 3/4 of a gallon. This is a much more efficient way to deliver irrigation water. We achieve an overall reduction in water use while optimizing plant health even though you will see water on multiple days and sometimes on multiple days in a row.
Priority Water Scheduling
In order to meet the 30% irrigation reduction required in Drought Stage 2, we have chosen to prioritize trees and actively used turf areas including sports field, open grassy areas where families may play catch. You may notice streetscapes and non-functional turf begin to appear stressed. Non-functional turf is a section of grass that is not utilized for recreational activities such as open play, cultural and sports events, athletic activities and picnics. The primary purpose of non-functional turf is aesthetic or ornamental.
Turf Conversion Program
We have converted some landscape areas from non-functional turf to drought friendly landscapes. We are currently identifying further areas for conversion. You will soon see signs in these areas and information here identifying the conversion area and estimated water savings. Fifteen acres have been identified for conversion from non-functional turf to drought friendly landscape.
Alternative Water Resources
We currently used recycled water in 25% of our parks, including our two golf courses, and even more streetscapes. Recycled water is produced at both of the City's wastewater treatment facilities. Recycled water has been treated to the highest level required by the California Department of Health Services and is approved for many uses, except drinking. Because recycled water is made from water waste and isn't drinkable, it isn't subject to the reductions required from the drought.
We are looking at ways to expand our use of recycled water to additional streetscapes and parks. We hope to see the conversion of Mahany Park to recycled water in the near future. Mahany Park is 225 acres so conversion of this park to recycled water would be a great asset to the community.
We Need Your Help Although we are part of the City operations, we are also a water customer. Which means we are required to achieve the same 30% reduction as business customers in addition to paying the surcharge. While we perform regular checks of our irrigations systems, with tens of thousand of sprinkler heads throughout Roseville's streetscapes and 72 parks, we can't be everywhere at once. So if you see a broken sprinkler head or waterline, please let us know by emailing (firstname.lastname@example.org) or calling (916) 774-5748 during regular business hours. Outside of regular business hours, call us at (916) 746-1274.