Studi hidraulika Sungai Cibereum dan Sungai Cimeneng menggunakan HEC - RAS 4.1 : studi kasus proyek pengendalian banjir Sungai Cibereum dan Sungai Cimeneng = Hydraulic study of Cibereum river and Cimeneng river using HEC - RAS 4.1 : case study of Cibereum River and Cimeneng river flood control proje