Comparison of Cropwat 8.0 and KP-1 in Analysis of Irrigation Water Needs in Cimulu Irrigation Area

The capacity of water demand in the Irrigation Area is very important, because it will determine the dimensions of all facilities and infrastructure buildings in the Irrigation Area. Water demand in an irrigation area can be determined by various methods, two of which are the Cropwat 8.0 method issued by FAO and the Ministry of Public Works method as in the Irrigation Planning Guidelines for the Irrigation Network Section or KP-01. Cimulu Irrigation Area is located in Tasikmalaya City and Tasikmalaya Regency. The Cimulu Irrigation Area (DI) covering an area of 1546.20 ha is irrigated from the Cimulu Dam in Tawangsari Village, Tawang District, Tasikmalaya City, located at 7* 19՛ 14.6” South Latitude and 108* 13՛ 17.4” East Longitude. The Cimulu weir is located on the Ciloseh river, which is under the management of the Citanduy River Area PSDA. Cimulu Irrigation Area (DI) which is part of the upstream Citanduy Service Unit (SUP) Balai PSDA Citanduy River Area which consists of 3 (three) Observer Working Areas, namely (1) Cimulu Observer Working Area with an area of 1008 ha of rice fields, (2) The Dalemsuba Observer Working Area with an irrigation area of 316.20 ha (3) Cihanjang Observer Working Area with an area of 222 ha of rice fields. The results of the analysis show that the highest value of irrigation water requirements for the KP-01 method occurs in the month of Dec_1 of 1.93 m3/sec, for the Cropwat 8.0 method, it occurs in the month of Sep_1 of 1.10 m3/sec. Comparison of the value of irrigation water needs in the month of Dec_1 KP-01-Cropwat 8.0 is 1.93 and 0.61 and in Sep-1 is 1.62 and 1.10. In general, the value of irrigation water requirements for the KP-01 method is greater than the Cropwat 8.0 method.