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Abstrak :
Intensitas curah hujan yang cukup tinggi di Indonesia yang tidak dimanfaatkan dengan optimal mempengaruhi keseimbangan neraca air, serta grey water yang tidak diolah kembali akan mempengaruhi kualitas badan air dan berdampak pada menurunnya kualitas lingkungan. Konsep pembangunan seperti green building yang menerapkan rainwater harvesting dan water recycling merupakan salah satu usaha untuk menjaga kelestarian air. Dalam penerapan sistem tersebut, terdapat risiko yang akan mempengaruhi kinerja investasinya. Pengumpulan dan pengolahan data dilakukan dengan metode survey, analisa statistik, dan monte carlo. Adapun variabel yang mempengaruhi kinerja investasinya adalah kesalahan seleksi material dan seleksi vendor, serta kesulitan prediksi produksi air olahan hujan sesuai dengan musim. ......The high intensity of rainfall in Indonesia which is not utilized optimally affect the balance of water and grey water which is not recycled also affect the quality of water bodies which has an impact to decrease environmental quality. The development concept such as green building which is implementing rainwater harvesting and water recycling is one of the efforts to preserve water. In the application of the system, there are risks that will affect the performance of the investment. Data was collected and processed through survey, statistical analysis, and monte carlo. The variables which affect the performance of the investment are a mistake of material selection and vendor selection, and the difficulty to forecast treated rain water according to the seasons.

Abstrak :
[ABSTRAK
Fenomena global warming membuat keseimbangan neraca air terganggu dan konsep pembangunan seperti green building merupakan salah satu usaha untuk menjaga kelestarian air. Oleh sebab itu, penulis memilih pengaruh aspek water conservation (WAC) terkait biaya konstruksi green building dengan harapan dapat memberikan informasi mengenai faktor dalam aspek WAC yang mempengaruhi perubahan biaya konstruksi green building apabila dibandingkan dengan bangunan konvensional, dan seberapa besar perubahan yang disebabkan oleh aspek tersebut. Dari penelitian ini diperoleh pengaruh biaya akibat penerapan WAC sebesar 1,75% dari nilai kontraknya. ABSTRAK
The phenomenon of global warming, making the stability of water balance distrubed and development concepts such as green building is one of the effort to maintain the sustainability of water. Therefore, the authors choose the effect of water conservation (WAC) aspects related to construction cost of green building in order to provide information about the factors of water conservation aspect which influence changes of green building construction costs compared to conventional buildings, and how much it changes. This study obtain the influence of Water Conservation aspect is 1,75% from the contract value., The phenomenon of global warming, making the stability of water balance distrubed and development concepts such as green building is one of the effort to maintain the sustainability of water. Therefore, the authors choose the effect of water conservation (WAC) aspects related to construction cost of green building in order to provide information about the factors of water conservation aspect which influence changes of green building construction costs compared to conventional buildings, and how much it changes. This study obtain the influence of Water Conservation aspect is 1,75% from the contract value.]