Abstract
Pauh Tinggi irrigation network planning which has an area of irrigation land of 473 ha. This irrigation plan draws water from the Pauh Tinggi Dam located in the Batanghari Hulu river, Kerinci Regency, Jambi. Population growth which is directly proportional to the increasing necessities of life, one of which is in the food sector, has made the government take the initiative to meet the needs and welfare of the community by opening land into productive areas of rice fields and fields, and making irrigation plans. In making irrigation planning, hydrological and rainfall calculations are needed to be able to make the right cropping system for farmers in Pauh Tinggi Village, Kerinci Regency, Jambi. A calculation of 17 alternative cropping patterns with different types of plant variants and different plans for the initial planting period were carried out by comparing with the mainstay debit factor (Q80). It was found that the cropping pattern is very possible always using the RICE-RICE-CROP cropping pattern. The most efficient and optimal planting pattern is the alternative planting pattern 14 in the form of RICE -RICE-CORN with Netto Field Water Requirements in tertiary plots (NFR tertiary) ranging from 0 - 1.30 ltr / sec / ha with a maximum of 1.30 ltr / sec / ha in January I, while irrigation water needs in the intake (DR intake) range 0 - 1.60 ltr sec / ha with a maximum of 1.60 ltr / sec / ha in January I.
Highlights
Irrigation is a human effort in irrigating plants that need water, useful for growing plants to get the benefits
The Pauh Tinggi Irrigation Area has an area of 473 ha of irrigation land, and is divided into 12 tertiary plots
In the calculation of irrigation water needs for secondary crops used the calculation of the most efficient cropping patterns, namely alternative cropping patterns 14 in August II
Summary
Irrigation is a human effort in irrigating plants that need water, useful for growing plants to get the benefits. Calculation of water requirements for land preparation is done by the Van de Goor Zijlstra method This method is based on water requirements to replace water losses due to evaporation and percolation in paddy fields that have been saturated for 30 days with a height of inundation of 250 mm, if there is a resting area of inundations of 300 mm or 8.33 mm / day. Estimating the magnitude of crop evapotranspiration there are several stages that must be carried out, namely suspecting reference evapotranspiration; determine the coefficient of the plant pay attention to local environmental conditions; such as climate variations at any time, altitude, land area, available groundwater, salinity, irrigation methods, and agricultural cultivation. The FJ Mock method is an analysis of the balance of monthly water discharge based on data on semi-monthly rainfall, evapotranspiration, soil moisture and groundwater storage. Calculation of irrigation water needs (NFR) can be done with the formula:
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