**4. Conclusions**

Improvement of the tertiary irrigation network is one of the adaptations to climate change for the farmer level. The improvement of the tertiary irrigation network is

*Improvement of Tertiary Irrigation Networks, Changes in Cropping Patterns, and Increasing… DOI: http://dx.doi.org/10.5772/intechopen.106266*

very much needed by farmers with further management carried out by the water-user farmer association. Improvements to the irrigation network have been carried out at 57 points and spread across all subdistricts from the lowlands, medium to highlands. The improvement of the tertiary irrigation network was able to increase the cropping index by 0.37, from 1.85 in 2015 to 2.22 in 2016, or equivalent to an area of 8,880 ha (standard area ±24,000 ha). The construction of irrigation networks was also able to increase production by 9,058 tons, from 44,305 tons in 2015 to 53,363 tons in 2016. In the following year (2017–2019), rice production decreased because farmers in several subdistricts switched commodities to corn. The role of water-user farmer associations in the improvement and optimal management of tertiary irrigation networks is very important. Thus, the management of water-user farmer associations must be regulated and functioned professionally in sustainable agricultural development in Indonesia.
