ANALISIS NERACA AIR IRIGASI TERHADAP RENCANA TATA TANAM TAHUNAN MENGGUNAKAN SOFTWARE CROPWAT VERSION 8.0

Studi Kasus Pada Daerah Irigasi Cikunten 1 Kabupaten Tasikmalaya

Abstrak

Tasikmalaya Regency has a very wide potential for irrigated agricultural land. However, all the existing potentials cannot be utilized optimally, such as a lack of data and information about the availability and demand for water taken from rivers through irrigation canals. This supply and need must be balanced with the water available in the river for agricultural needs. The Cikunten 1 irrigation area is one of the irrigation areas built in 1963, and irrigates 979 Ha of a large secondary irrigated agricultural area. This study uses a quantitative method using survey data or direct experiments in the field to determine the condition of the canal. Then an analysis of the needs and availability of water was carried out using the cropwat software version 8.0. The results of this study can be interpreted that the availability and demand for water irrigation in the Cikunten 1 Secondary Irrigation Area is very optimal. After calculating using the Penman method, the largest availability of irrigation water occurred in April at 128.36 l/s/ha and the smallest occurred in October at 45.21 l/s/ha, while the calculation of irrigation water needs used cropwat software version 8.0. the largest occurred in February of 2.38 l/s/ha. Calculation of the cropping pattern schedule using the cropwat software version 8.0 with simulations of period 1 rice, period 2 rice and crops have very optimal values, in period 1 rice starts from October to January with the largest plant water requirement in October of 0.92 l/ sec/ha and the paddy 2 period starts from February to May with the largest crop water requirement in February of 0.85 l/s/ha, including land preparation, while for crops it starts from June to September with crop water requirements the largest in September 0.06 l/s/ha.