Community’s small irrigation investment gives impact on expansion of rice planted area and production. The study aims to assess impacts of small irrigation investment on rice planted area, production, and farmers’ income enhancement, and it was carried out during period of March to December 2013 in rainfed lowland areas in West Java, Central Java, and West Nusa Tenggara Provinces. Development of small irrigation based on community investment (SIBCI) is analyzed using Net Present Value, Incremental Benefit / Cost Ratio and Financial Internal Rate of Return approaches. Small irrigation was useful for improving rice planted area, production, and farmers’ income. Application of self-help water pumps was able to increase the area of wetland rice and cropping index. Small irrigation investments in both pump and gravity were financially feasible. The role of communities in small irrigation investment was significant despite financial limitation. Non-governmental funds allocated for pump irrigation network development were relatively small compared to that of gravity. Farmers’ participation in gravitational irrigation construction was relatively low and not all farmers became the P3A members. Small irrigation development requires synergy of social, physical, human, and natural capitals. Community’s participation in individual irrigation investment was relatively low contrary to that of managed by groups. The government need to collaborate with communities to manage water resources into community-based productive irrigation. AbstrakInvestasi irigasi kecil oleh masyarakat memberikan dampak terhadap peningkatan luas tanam dan produksi padi. Penelitian bertujuan mengkaji dampak irigasi kecil terhadap peningkatan luas tanam dan produksi padi. Penelitian dilakukan pada bulan Maret - Desember 2013 pada agro-ekosistem lahan tadah hujan di Jawa Barat, Jawa Tengah dan Nusa Tenggara Barat. Pengembangan irigasi kecil berbasis investasi masyarakat (IKBIM) dianalisis menggunakan Net Present Value, Incremental Benefit/Cost Ratio dan Financial Internal Rate of Return. Irigasi kecil sangat besar manfaatnya dalam meningkatkan perluasan tanam, produksi dan pendapatan petani. Penggunaan pompa secara swadaya mampu meningkatkan luas areal padi sawah dan indeks pertanaman. Investasi irigasi kecil baik pompa maupun gravitasi dinilai layak dilakukan. Peran masyarakat dalam investasi irigasi kecil sangat dominan, yang ditunjukkan dengan modal sosialnya yang tinggi, tetapi sering terbentur pada kemampuan finansial yang terbatas. Dana swadaya masyarakat yang dialokasikan untuk pengembangan jaringan irigasi pompa relatif kecil dibanding jaringan irigasi grafitasi. Partisipasi petani dalam pembangunan fisik untuk Irigasi Gravitasi masih rendah dan tidak semua petani menjadi anggota P3A. Pengembangan irigasi kecil memerlukan sinergi modal sosial, fisik, manusia dan alam. Tingkat partisipasi masyarakat kecil sekali untuk investasi irigasi yang dikelola secara perorangan...