Open AccessEvaluation of surface water for agricultural irrigation in Lobalain District, Rote Ndao Regency, East Nusa Tenggara Province, Indonesia
Author(s) -
Rony Rahmad Riady,
Wahyu Wilopo,
I Wayan Warmada
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/930/1/012057
Subject(s) - irrigation , environmental science , cropping , sodium adsorption ratio , agriculture , groundwater , surface water , water resources , farm water , irrigation statistics , surface irrigation , paddy field , productivity , water resource management , hydrology (agriculture) , water conservation , geography , environmental engineering , agronomy , drip irrigation , engineering , ecology , geotechnical engineering , macroeconomics , archaeology , economics , biology
The average rice productivity of the Rote Ndao Regency is still below the national rice productivity. The cropping pattern’s lack of management and limited water sources can only be planted once a year. This study aims to determine the availability and quality of surface water used for irrigation with the existing rice-corn-fallow cropping pattern. The research was carried out by measuring discharge in the field, surveying the types and cropping patterns, irrigation area research, surface water quality analysis, and hydrological analysis. The results showed that the need for irrigation water for agriculture in the study area with the current cropping pattern was 0.84 lt/second/ha. Therefore, the existing irrigation area of ±3,762.00 Ha requires a water discharge of ±3.159 m 3 /second. The availability of surface water in the Lobalain District is low, with a discharge of ±1.598 m 3 /second. Surface water quality shows the percentage of sodium (Na%) dominated by excellent to permissible class, and the sodium adsorption ratio (SAR) excellent. The existing resource of surface water could not support agricultural irrigation. Therefore, it is necessary to find an alternative water source such as groundwater.