ABSTRAKHujan rancangan dengan menggunakan analisis frekuensi regional memberikan keuntungan pada sekelompok data yang memiliki jumlah data terbatas. Data hujan yang terbatas yang digunakan untuk menghitung besarnya hujan rancangan memiliki tingkat kesalahan yang sangat besar untuk periode ulang yang tinggi. Oleh karena itu, maka digunakan analisis frekuensi regional berdasarkan pendekatan TL-momen. Jenis distribusi yang digunakan terdiri dari tiga yaitu Generalized Extreme Value (GEV), Generalized Pareto (GPA) dan Generalized Logistic (GLO). Ketiga jenis distribusi yang digunakan hanya Generalized Extreme Value (GEV) dan Generalized Logistic (GLO) yang mendekati nilai rata-rata regionalnya berdasarkan TL-Moment Ratio, sementara berdasarkan hasil pengujian Z distribusi menunjukkan Generalized Extreme Value (GEV) memberikan hasil yang terbaik. Dengan demikian, maka hujan rancangan berdasarkan analisis frekuensi regional terhadap data hujan maksimum tahunan, dengan panjang data minimal 10 tahun, menggunakan Generalized Extreme Value (GEV) di DAS Jakarta telah dapat ditentukan.
Kata Kunci: Hujan rancangan, analisis frekuensi, generalized logistic, TL-momen, generalized etreme value
ABSTRACTThe designs rainfall were estimated with the regional frequency analysis provides benefits to a dataset that has a limited amount of data. Minimum data used in calculating the amount of design rainfall has a very large error for higher return period. Therefore, the regional frequency analysis was used based on TL-moments method. There are three types of probability distributions used in this study, namely the Generalized Extreme Value (GEV), Generalized Pareto (GPA) and the Generalized Logistic (GLO). Two of the three types probability distributions are the best choice by the TL-moment ratio diagrams which are Generalized Extreme Value, and Generalized Logistic. An another analysis was conducted by the Z test and the Generalized Extreme Value (GEV) gives the best results. Therefore, the designs rainfall were estimated based on the regional frequency analysis in Jakarta watershed using the Generalized Extreme Value (GEV) has been determined.
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