PENGARUH SISTEM DRAINASE PERTANIAN TERHADAP MUKA AIR TANAH DI DAERAH PESISIR PANTAI (Studi Kasus: Daerah Pesisir Selatan Kecamatan Srandakan, Kabupaten Bantul, Daerah Istimewa Yogyakarta)

• Main Authors: , MOHAMMAD TAUFAN RAHARDIAN, , Dr. Ir. Rachmad Jayadi, M.Eng.
• Format: Theses and Dissertations NonPeerReviewed
• Published: [Yogyakarta] : Universitas Gadjah Mada 2013
• Subjects: ETD
• Online Access: https://repository.ugm.ac.id/124781/; http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=64939
• Institution: Universitas Gadjah Mada

Coastal areas have water resources characteristics that is relatively poor compared to other areas so their potential as agricultural land is difficult to be developed. In the southern coastal area of Srandakan district, Bantul regency, Special Region of Yogyakarta which we observed there is an agricultural drainage system that has the potential to be a supplier of water demand for agricultural land in the vicinity. Sandy soil in this location is very likely allowing water to seep into the ground. Therefore, this research was conducted to determine the effect of the drainage system on groundwater supply for coastal land in the lower reaches of the drainage channel. This research was conducted by taking the water level data directly in the drainage channel and wells downstream. During these measurements, precipitation and evaporation occured also collected. From these results, the influence of water in the agricultural drainage systems to the water level in the lower reaches during the rainy and dry season. The result is expected to be considered as an alternative supply for irrigation water demands when needed and can support the survival of casuarina. The results showed that the groundwater flow obtained from the water balance analysis which is allegedly come from agricultural drainage channel has the maximum amount of 168.52 m3 and minimum of 125.64 m3 while the depth of water in the drainage channel ranging between 0.56 m to 1.07 m and the maximum rainfall of 16.5 mm and a minimum of 0 mm.. However, the influence of the depth of water in agricultural drainage channel to the groundwater level is not significant, rainfall also has minimum effect on the groundwater level. Groundwater flow can not be correlated with agricultural drainage channels, so that the initial allegations that the water from agricultural drainage channel has potential as a source of groundwater recharge to support the survival of casuarina that will improve land resources in the coastal area is still unproven.