S unter Icon Apartment in North Jakarta is a residence which is located at Griya Sejahtera North Jakarta Street and was built in a land with 5000 m2 wide. The residence is consisted of 2 towers, which are A dan B. Each tower is consisted of 23 floors where 3 rd A- 27 th floor is for typical residence, and from basement to the 2 nd floor is for commercial area. As for the typical residence, there are 4 type which are type I BR, type 2 BR, type 3 BR A and type 3 BR. Each height of tower respectively is 76, 8 m2. This apartment uses a roof tank system where the water flows from top tothe botttom in a gravity condition. The water source is taken from the district water company (PDAM) and the enters to the bottom reservoir. Clean water requirement for Tower A is 288, 4 m3/hour and Tower is 281, 82 m3/hour/. While the capacity for the reservoir at the bottom is 488 m3. The water that flows from the bottom reservoir is pumped for 22 hours using a transfer pump to the upper reservoir with 73, 732 m and 73, 4142 m of head loss in tower A and tower B respectively. Clean water from 27 th floor to the 1 st floor is distributed in a gravity condition with a PVC 100 -200 mm pipe. Due to increasing the pressure at 3 upper top floors for both tower A dan B, booster pump need to be place in pipe 1 and 4 Tower A with a 423 litres/minute capacity and a 9,787 m head, and also in pipe 2 and 3 tower A with a 485 litres/minute capacity and 9,885 m head. As for tower B, nooster pumps are placed in pipe 5 and 8 with a capacity of 412,5 litres/minute/ and head of 9,81 m and also in pipe 6 and 7 with a capacity of 427, 9 litres/minute and a head of 9,89 m. The PRV is placed on the 11 th floor in several pipes for both tower A and B. Sewerage distribution system uses a mixing system where sewerage pipe 80 - 120 mm. Rain water that enters is transferred through a pipe with a diameter 100 -150 mm and eventually dischared to drainage.