POTENSI AIR HUJAN SEBAGAI CADANGAN AIR BERSIH DI KAMPUS LAPANGAN INSTITUT TEKNOLOGI NASIONAL YOGYAKARTA

The fulfillment of clean water needs is highly dependent on the availability of water sources which include ground water, surface water, and rain water. Rainwater is one of the natural resources that has not been managed optimally so that it cannot meet the supply of clean water that is used continuously because the amount fluctuates based on seasonal changes. The rainwater treatment process can be carried out using the rainwater collection method (PAH) by utilizing the roof of the building as a catchment area and then channeling it to the storage tank through gutters or pipes. This study was conducted to calculate the potential availability of rainwater, calculate the need for clean water at the ITNY field campus, and calculate the capacity of the PAH tank. The results obtained that the total availability of rainwater is 729.33 m 3 /year, the need for clean water at the ITNY field campus is 1.992 m 3 /day or 60 m 3 /month or 720 m 3 /year, with a PAH tank capacity of 200 m 3 and at the end of the first year leaving as much as 145.51 m 3 of water so that it can be reused the following year.