Abstract :

: The hydrological conditions of the Amarasi District, Kupang Regency have 3-4 wet months and 8-9 dry months according to Oldeman’s classification. Annual rainfall in the last ten years shows the lowest rainfall was 1,461mm and the highest was 2,688mm, the average annual rainfall was 1,859mm. The Amarasi region is included in zones D and E of the Oldeman climate classification. The practice of utilizing limited water resources by planting fodder crops in the form of legumes and grasses as well as food crops in integrated dry land agriculture has been carried out by the Amarasi community. This research examines the availability and demand for domestic, agricultural and livestock water and will produce an availability index as the carrying capacity of regional water availability. The method used to calculate the availability of water originating from rain is runoff analysis based on weighted coefficients for each land use, then analyzed in a monthly series and compared with the level of water demand for each use. Domestic water needs, livestock drinking and irrigation follow SNI 19-6728.1.2002. Then the analysis results are interpreted with tables and time series graphs. The research results show the following time series of water availability: January: 44,626,635.13m3; February: 31,210,646.01m3; March : 20,050,098.53m3; April: 11,726,074.47m3; May : 3,023,180.66m3; June: 1,747,689.52m3; July : 973,284.18m3; August : 168,880.36m3; September: 1,026,614.82m3. October 2,846,522.91m3; November 10,713,903.37m3; and December: 26,871,976.23m3. The amount of water demand in the time series is as follows: January: 1,929,491.70m3; February: 1,391,817.98m3; March: 1,697,543.42m3; April: 781,567.95m3; May : 883,736.22m3; June: 755,911.95m3; July : 284,777.42m3; August : 384,569.42m3; September: 387,871.95m3. October 355,448.02m3; November 3,242,283.15m3; and December: 2,631,159.26m3. Water availability index: January: 4.32 (good), February: 4.46 (good), March: 8.47 (good), April: 6.67 (good), May: 29.23 (slight critical), June: 43.25 (mild critical), July: 29.26 (mild critical), August: 227.27 (bad/severe critical), September: 37.78 (mild critical), October 12.49 (good), November: 30.26 (mild critical) and December 9.79 (good).

---

Keywords :

Amarasi, rainwater, Time series., water availability, water requirement

---

References :

1. Amarasi Dalam Angka. Biro Pusat Statistik Kabupaten Kupang-2023.
2. Gupta R.S., 1989. Hidrology and Hydraulic Systems. Prentice Hall, Englewood Cliffs-New Jersey.
3. Viessman Jr, Knapp J.W Lewis G.L. and Harbaugh T.E, 1977. Introduction to Hydrology. Harper and Row- New York.
4. Linsley R. K, Kohler M.A dan Pulhus J.L.H, 1989. Hidrologi Untuk Insinyur. Erlangga-Jakarta.
5. Asdak Chay, 2010. Hidrologi dan Pengelolaan Daerah Aliran Sungai. Gadjah Mada University Perss. Jogyakarta.
6. Tunas I G., 2007. Optimasi Parameter Model Mock Untuk Menghitung Debit Andalan Sungai Miu. Smartek-Jural Vol 5. No. 1, Univ, Tadulako.
7. Zarkasih M.R, Rohmat D dan Nur D.M., 2018 . Evaluasi Ketersediaan Dan Tingkat Pemenuhan Kebutuhan Air Di Sub Das Cikeruh. Jurnal Pendidikan Geografi, Volume 18, Nomor 1, April 2018.
8. Badan Standardisasi Nasional. Penyusunan neraca sumber daya Bagian 1: Sumber daya air spasial .Standar Nasional Indonesia, SNI 19-6728.1-2002.
9. Triatmodjo B, 2014. Hidrologi Terapan, Beta Offset, Yogyakarta.
10. Hatmoko W, Radhika, Amirwandi S dan Fauzi M, 2012. Neraca Ketersediaan Air Wilayah Sungai di Indonesia.  Pusat Litbang Sumberdaya Air Bandung. Indonesia.
11. Harto S.Br, 1993. Analisis Hidrologi. Gramedia Pustaka Utama. Jakarta.
12. Bayong H.K. Tj, 2004. Klimatologi ITB Press-Bandung Indonesia.
13. Rahmanto, dkk 2022, Rahmanto E., Rahmabudhi S., dan Kustia T. 2022. Kajian Analisis Spasial Penentuan Tipe Iklim Menurut Klasifikasi Schmidt–Ferguson Menggunakan Metode Thiessen–Polygon di Provinsi Riau. Bulettin GAW Bariri. Vol. 3 No. 1. Hal. 35–42. doi: 10.31172/bgb.v3i1.66
14. Fan L., Liu G., Wang F., Geissen V dan Ritsema C.J., 2013. Faktor Yang Mempengaruhi Konsumsi Air Domestik di Rumah Tangga Pedesaan Akibat Akses Peningkatan Pasokan Air. Tinjauan Pada Daerah Aliran Sungai Wei-Tingkok . Plos One Vol.8. No. 8. E71977, 2013. https://doi.org/10.1371/journal pone 0071977
15. Hasan, dkk.,2022 ) Hasan M.R, Yani A dan Rahayu S, 2022. Model Evaluasi Penerapan Aspek Pakan dan Air Minum dalam Good Farming Practice Peternakan Domba di UP3J Bogor. Jurnal Ilmu Produksi dan Teknologi Hasil Peternakan Vol. 10 No. 3 Oktober 2022, Hlm: 119-125. DOI: https://doi.org/10.29244/jipthp.10.2.119-125
16. Yamin, M., S. Rahayu, M. Baihaqi, & M. Duljaman. 2014. Teknologi Produksi Ternak Domba dan Kambing. IPB Press, Bogor
17. Meehan M.A, Stoka G dan Mostrom M, 2021. Kebutuhan Air Ternak. North Dakota State Universty. https://www.ndsu.edu/agriculture/ag-home/directory/miranda-meehan