Reviving the Palos Verdes Reservoir FIGURE 4 Reservoir floating cover final inspection phase during full capacity fill The typical potable water floating cover maintenance plan involves an annual cleaning of the full floating cover. Rainwater collection troughs are generally cleaned twice a year. With the troughs, extra attention should be paid to remove leaves, twigs, rocks and other foreign objects. This is critical to keep the floating cover from being damaged and reduces wear and tear on the system while providing a good visual check of all systems. The authors recommend that this type of floating cover cleaning schedule be part of all reservoir cover operations and maintenance plans. It helps keep the floating cover in good operating 14 Geosynthetics | August September 2019 condition and gives the system installer and the site owners extremely useful information on how the system is aging. The Palos Verdes site is a great example of how regular inspection supports long-term performance. The facility has reached its current age through the support of a strong operations and maintenance program, along with operators who have routinely taken the long view on what next steps are needed to protect water quality and ensure longevity (Figure 4). Regarding the geosynthetic system now installed at Palos Verdes, the type of CSPE geomembrane used for the lining and floating cover has a strong