IMPROVING EFFICIENCY AND PRODUCTIVITY OF TAMPO IRRIGATION SYSTEM USING REMOTE SENSING AND GEOGRAPHIC INFORMATION SYSTEM

Roza Syofyan, Elvi and Herdianto, Revalin (2016) IMPROVING EFFICIENCY AND PRODUCTIVITY OF TAMPO IRRIGATION SYSTEM USING REMOTE SENSING AND GEOGRAPHIC INFORMATION SYSTEM. National Conference of Applied Engineering, Business and Information Technology, Politeknik Negeri Padang . pp. 126-133. ISSN 2541-111x

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Abstract

Tampo irrigation system has experienced a decline in crop productivity since year 2012. Average productivity in 2012 was 5.74 t/ha while in 2013 it decreases to 5.66 t/ha. The main problem is water allocation and management and water scarcity during dry seasons. With limited water during dry seasons, farmers in the upstream of the irrigation area benefit from taking water directly from primary channels, leaving those in the downstream area short of water. Farmers in the upstream area may regularly plant paddy two cycles per year with one horticulture cycle in the remaining year. In contrast, farmers in the downstream region could only produce one paddy cycle and one horticulture. Actually, total amount of water are sufficient considering net farm requirement and total paddy farm. Therefore, water management and allocation are the soundest problem. One possible solution is to return water from higher farms to the main channels that enable re-use in the lower area. However, a difficulty arises in mapping water flow, since the existing channels only partially work due to some problems such as siltation and aggradation or due to improper channel designs. We propose a solution using satellite data such as DEM (Digital Elevation Model) and GPS mapping to track flow from main channel to farms. Whenever possible, water can be returned from higher farms to channel of lower elevation to add total flow to the lower area. The DEM used in this study is 30-m ASTER GDEM, processed with TAS GIS. Water requirements are recalculated for the irrigation area to estimate real consumption. Water allocation is then established per unit area and per tertiary channel. This data is used to map new water requirement for the entire area. Using elevation data from DEM, new channel alignment is proposed to return flow to lower area. With this new water allocation scheme, some area in the lower region receive more water. Yet, some difficulties remain in lower area due to higher farm elevation than the existing channel. For this problem, a new solution is proposed by using new water sources, either from surrounding area or from new irrigation project by cross-supply scheme. It is expected that this scheme improves both crop cycle and crop efficiency in the lower region without reducing productivity in the upper irrigation region.

Item Type:Article
Subjects:G Technology > GB Hydraulic engineering. Ocean engineering
G Technology > GC Environmental technology. Sanitary engineering
G Technology > GA Engineering (General). Civil engineering (General)
Divisions:Luar PNP > Journal, Proceeding
ID Code:600
Deposited By:Rahmat Hidayat
Deposited On:12 Oct 2017 09:57
Last Modified:22 Nov 2018 19:15

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