Inspection holes can be places through the center of tank if required.
Filtering the water before it enters the tank with a LifeRain filteration unit will prevent the LifeRain tank Module from silting up. Good housekeeping during installation and ensuring that the inlet pipes were adequately sealed will also prevent the LifeRain tank modules from silting up. Through Geotextile and sand only pure water can have access to the Life Green tank.
The LifeRain tank modules should be completely surrounded by a layer of 300mm coarse washed river sand with no fines compacted to 95% density on both the top and the sides of the tank.
The capillary action of water within the tank provides continuous motion due to the surrounding sand and geotextile. The continuous motion provides additional surface area for aerobic decomposition and prevents stratification (layering) of the water. Hence, keeping the water quality fresh.
The waterproofing liner is heat-sealed by a poly welder. The liner is available in 8m wide lengths. The optimum tank configuration would be designed to prevent having to poly weld the liner.
Poly Welders. They can be found in your local yellow pages.
No, not unless the waterproof liner has been punctured or torn. Additional protection can be provided by using a root barrier of geotextile outside the liner.
The geotextile prevents the surrounding bed of sand from entering the tank and protects the waterproof liner from any potential sharp edges.
Your excavation needs to allow minimum of 300mm on each side of the tank for adequate compaction of backfill materials. The depth of the tank should allow 100mm below the LifeRain tank modules and 300-500m above the tank on whether vehicular traffic is expected,
The filtration unit should be regularly cleaned out after rainfall and washed.