T The Marbella Kemang Residences Apartment is one of residential projects which are built to meet the needs for the residences of Jakarta people, located on JI. Bangka no. 45 A, Bangka Jakarta Selatan. The Marbella Kemang Residences Apartment is built on a 9192 m2 land and its planning covering 8908 m2. Tower B consists of 20 floors, one mezzanine floor, one semi-basement floor, and one basement floor. Tower B has 3 types of apartment with total room of 289 room units. The basement and semi-basement floor are used for parking lot. This apartment uses clean water sources from PDAM (municipal Water Company), which is then accommodated on the reservoir lower with 202.5 m3 capacity. The water from the lower reservoir will be pumped to the upper reservoir using a transfer pump with the debit of 27.151m3/jam.. The capacity of upper reservoir is 160 m3. From the upper reservoir, the water distribution is flowed into each floor, but the 3 uppermost floors experience the shortage of pressure, thus a. booster pump is used to distribute it. The clean water upright pipe has 65 mm diameter. Pressure reducer valve (PRV) is installed on the 14th floor. The discharge system in the Marbella Kemang Residence apartment uses a mixed system, in which dirty water and waste water are mixed into one and distributed into the discharge pipe. This discharged water will be distributed to the processing plant located on the basement floor in a gravitation way. Ven system consists of upright pipe ven, branch ven, and release ven. The release ven is installed on each floor to 10 calculated from the uppermost floor aimed at flattening the pressure. The raiser has 100 mm diameter and the ven pipe diameter is 50 mm. Based on the Meteorology and Geophysics Board (BMG) data the average rainfall is 138,75 mm/hour. The distribution of rain water from the roof to the city resorption well and drainage channel use upright pipe of 200 mm diameter.