Cleaning of racks (automatically or manually) at regular intervals should be arranged in a suitable manner. 2. The frequency with which the racks are cleaned would be determined by the rate at which trash accumulates. 3. At any given moment, no more than 33% of the trash rack space should be permitted to clog the racks. 4. In the case of Type 1 racks located in reservoirs, a platform at an appropriate level above the trash rack structure should be built to be utilized as a maintenance platform. 5. The platform's level should be set so that the water level in the pond or reservoir falls below the platform's level at least once a year. 6. This level can be set arbitrarily at the height of at least 5 meters above the minimum drawdown level (MDDL). 7. Each rack should include hooks to allow for lifting the rack in Type 1 for cleaning, if necessary. 8. For the easy raising of racks, chains may be linked to these hooks, and the end of the chains can be tied to the top platform.