Doha Festival City, Al Shamal Road, Doha, Qatar

To provide the water retention (and stormwater management) system to collect and harvest rainwater for use at the IKEA mega store.

The system supplied involves the installation of 17,000 sets of VersiTank^® VT840 in five layers in an excavated pit with overall depth (pit bottom to ground surface) of 5.8m. Measuring 42m length x 24m width x 2.1m height with an estimated volume of 2,100 m³, the modular VersiTank is able to accommodate maximum inflow rate of 570 L/s and outflow rate of 24 L/s.

The retained rainwater is used for irrigation of landscaped gardens and miscellaneous cleaning at IKEA’s 32,000m2 flagship store and its immediate vicinity. This provision is especially beneficial in a rain-scarce region, where precipitation is almost nil in summer months.

Doha Festival City is the largest shopping mall in Qatar. Upon completion, the almost half million sq m iconic mega complex will host more than 500 retail and dining outlets, feature an entertainment and leisure complex, automotive showrooms and international hotels and convention centre.

Singapore Polytechnic

To provide an underground tank facility for collection, filtration, retention, and recycling of rain water that is both functional and aesthetically pleasing at the “Ecoasis”.

A pit was excavated according to project requirements to accommodate VersiTank^® to be installed in two layers. The base of the pit was compacted and leveled with a layer of coarse sand and an impermeable HDPE liner installed to form a retention tank. An outlet pipe leading to a sump was inserted just above the pit base. An overflow outlet leading to a discharge drain and a pump linked to a conveniently positioned tap are located in the sump.

Assembled VersiTank^® units were positioned in two layers within the tank and completely enveloped with permeable geotextile fabric overlapped by 200 mm where they connect. The geotextile was topped with 200 mm of coarse sand and decorative pebble rocks spread on top. Planting at the periphery of the tank completed the installation.

The rainwater harvesting facility provided by this VersiTank^® installation demonstrates how the twin concepts of Sustainable Building and Sustainable Living are put into practice by this educational institution – improving its water efficiency by providing water for irrigation and general washing and contributing to stormwater management by offering filtration at source and also helping to reduce peak flows during heavy rainfall.

Bukit Panjang, Singapore

To provide underground tank facilities for infiltration and filtration of stormwater before discharge into the local storm drain network in the sports park.

Pits were excavated to specification at pre-determined locations in the compound of the sports park. Each pit is compacted and leveled with a layer of coarse sand and lined with geotextile. VersiTank^® units assembled on-site were then positioned in the pits and covered over with geotextile lapped and sealed at all joints to envelope each tank.

The geotextile filter fabric allows rainwater to pass or percolate into the tank below but ensures that solids, including mud and clay, are filtered and prevented from entering. Water that percolate into the tank, either slowly infiltrates into the surrounding substrate or is channeled into connected pipes linked to the immediate drainage network for discharge. The sides and the top of the pit is backfilled with coarse sand and topped with regular soil for establishment of landscape plants, completing the VersiTank installation.

The underground tank installations eliminate the need for visible concrete drains on the surface.

Punggol, SIngapore

To provide facility for filtration and infiltration of stormwater before its discharge into the local storm drain network and also eliminate requirement for visible surface concrete drains at the exercise stations along the Riverside Walk. 

Linear pits were excavated at pre-determined locations along the riverside according to specifications. The base of each pit is compacted and leveled with a layer of coarse sand and lined with geotextile.VersiTank^® units, assembled on-site, were then installed in the pits and covered over with geotextile lapped and sealed at all joints to envelope each tank.

The filter provided by the geotextile fabric allows rainwater to pass readily through into the tank below but ensures that solids, including mud and clay, are filtered and prevented from entering. Water entering the tank, either slowly infiltrates into the surrounding substrate or is channeled to connected pipes and discharged directly into the immediate drainage network. The sides of the pit and also the top of the tank are backfilled with coarse sand, completing the installation and creating dry sand pit areas where exercise equipment are installed.

The dry ponds eliminate the need for an impermeable concrete base for the installation of the exercise equipment at the exercise stations, allowing both the stations and equipment installed to merge seamlessly into the linear park along the river.

Punggol Lodge, Singapore

To provide underground tank facilities for infiltration and filtration of stormwater before discharge into the local storm drain network and to create rain garden dry pond features at the foot of 2 HDB Apartment blocks in Punggol Lodge 

Large pits were excavated to specification at the foot of the 2 HDB apartment blocks. The base of each pit is compacted and leveled with a layer of coarse sand and lined with geotextile. VersiTank^® units were then assembled on-site and positioned in the pits and covered over with geotextile lapped and sealed at all joints to envelope each tank installed.

The geotextile filter fabric allows rainwater to readily pass or percolate through into the tank but ensures that solids, including mud and clay, are filtered and prevented from entering the tanks below. Water that percolate into the tank, either slowly infiltrates into the surrounding substrate or is channeled into connected pipes linked to the immediate drainage network for the clear filtered stormwater to be discharged. The sides and the top of the pits are backfilled with coarse sand, completing the dry pond features.

The areas surrounding the dry ponds are landscaped, creating rain garden features which provide a refreshing and therapeutic respite for residents in the immediate vicinity returning home from a hard day at work.

Punggol, Singapore

To provide percolation and infiltration tanks to facilitate filtration and infiltration of stormwater before it is discharged into the local storm drain network and eliminate requirement for visible surface concrete drains to facilitate drainage in the children’s play areas at the Waterfront Promenade.

Large pits were excavated within the designated areas where playground features are to be installed in the compound of the waterfront park. The bottom of each pit is compacted and leveled with a layer of coarse sand and lined with geotextile.

VersiTank^® units assembled on-site were then positioned in the pits and covered over with geotextile lapped and sealed at all joints to envelope each tank. The geotextile filter fabric permits rainwater to readily pass through and enter the tank below but ensures that solids, including mud and clay, are filtered and prevented from entering. Water which has percolated through into the tank either slowly infiltrates into the surrounding substrate or is channeled to connected pipes linked directly to the immediate drainage network for discharge.

The sides of the pits, the tops of the tanks and the area within the confines of the raised boundary of each playground shape are backfilled with coarse sand. The sand pits or dry ponds provide the permeable ground to accommodate playground equipment which includes slides and mini obstacles, swinging-planks and cargo nets, designed to bring out spirit of adventure and fun. The permeable sand dry out quickly and provide a soft and safe landing in inevitable falls and boisterous play.

Mt Rosie – Singapore

To provide tank facility for converting existing swimming pool into underground water storage tank for collecting and retaining stormwater for re-use.

The swimming pool is lined with a geotextile fabric and 2 layers of VersiTank positioned on top filling the entire pool area. Thereafter the installed VersiTank units were enveloped with geotextile fabric and covered with coarse sand and topped with planting soil. Subsequent planting on top conceals the underground water collection and storage tank and converts the pool area into additional garden space.

Ewart Park – Singapore

To provide tank facility for collecting and retaining stormwater for re-use.

A pit was excavated large enough to accommodate the calculated number of VersiTank to be installed. The base of the pit was compacted and levelled with a layer of coarse sand and a liner installed forming an impermeable tank within which assembled VersiTank units were positioned. Piping for inlet, outlet and overflow points were installed. Thereafter the installed VersiTank units were enveloped with a permeable geotextile fabric and covered with coarse sand and topped with planting soil. Planting on top makes the stormwater collection tank completely invisible and high compressive strength allows the space on top to be trafficable so that surface garden space is not compromised.

Greenwood Sanctuary @Admiralty – Singapore

To provide facility for infiltration and filtration of stormwater before discharge into the local storm drain network and creating dry pond features in the park.

Eleven pits were excavated to specification in the compound of the park. Each pit is compacted and levelled with a layer of coarse sand and lined with geotextile. VersiTank units were positioned in the pits according to pre-planned designs and covered over with geotextile lapped and sealed at all joints to envelope each tank.

The geotextile allows rainwater to readily pass but ensures that solids, including mud and clay, are filtered and prevented from entering the tanks below. Sand is levelled over the geotextile and topped with a coarse aggregate layer.

Pipes were then installed connecting the tanks either directly to a discharge outlet or to other inter-connected underground tanks sharing the same discharge outlet. Subsequently a fine aggregate layer is added and finished with sand to create dry pond features.