Lawn Irrigation Return Flow Monitoring Wells
Where does the water we pour on our lawns go?
Good water supply management means looking at all options to obtain supplies for our growing Town. The most cost-effective solution for additional water supplies are those already located within the Town. The most sustainable supplies are renewable surface water rights such as those owned by the Town on Plum Creek and East Cherry Creek. These creeks are considered renewable supplies because water is continually flowing into the creeks from precipitation and stormwater runoff. However, there is an emerging and growing source of supply for these creeks that positively impact our water rights: Lawn Irrigation Return Flows (LIRFs).
Castle Rock residents pour about half of all the water used in Town on irrigation. Of that lawn irrigation water, some seeps into the ground and nourishes plants, some evaporates, and the rest travels underground back into to the creeks. In fact, throughout the Front Range, LIRFs have actually resulted in perennial streams in historically dry channels! Figuring out how much water from lawn irrigation returns to the creek and how long that journey takes will help us fully and efficiently use our existing water rights, and is the reason for the LIRF monitoring well project. Castle Rock Water expects this renewable water source could provide 5% of our total water supply, expanding our diverse water supply portfolio.
Castle Rock Water is drilling 26 shallow monitoring wells throughout Town. These 50- to 120-foot deep wells will be located in open spaces, usually within an utility easement. The wells monitor and quantify the water seeping underground and traveling to the creek. The drilling will take one to two days for each well.
Construction will take place Monday through Friday, 7 a.m. to 7 p.m. and Saturday, 8 a.m. to 6 p.m. No overnight drilling is needed. Residents can expect some traffic lane closures. However, there will be no water service disruption. The well head will usually be flush mounted with the ground and the surrounding property will be re-vegetated. Upon completion, staff will access the monitoring equipment periodically.
All of the wells were completed in February 2021. They will be fitted with the equipment to measure the groundwater level this summer.