Analisis Kapasitas Tampungan Embung Bulakan Untuk Memenuhi Kekurangan Kebutuhan Air Irigasi Di Kecamatan Payakumbuh Selatan

Abstract

The dry season often causing hundreds of hectares of rice fields suffer from drought, coupled
with reduced discharge of irrigation water sources. This problem can be experienced by  the
farmers in various areas, including in the District of  South Payakumbuh. As an alternative to
solving the problem if there is such a thing is to build a small dam that is used to store water
for the rainy season and used for the dry season. This paper will discuss about availability of
water, irrigation water requirements, analyze capacity small dam, operating time opening the
sluicegate,  rice area  which can be irrigated  and calculate the  dimensions  of the  spillway.
From the calculation of available water discharge approximately 159.33 l / dt, maximum
irrigation water requirement of 1.204 l/sec/ha,  the maximum reservoir for irrigation around
12577.177 m3
. Rice area which can be  irrigated calculated every hour on each opening  the
sluicegate as high as 0.1 m, 0.15 m, 0.20 m, 0.25 m, and 0.30 m for 10 hours and a maximum
rice area which can be irrigated successively measuring 195.424 ha, 284.876 ha, 368.494 ha,
445.991 ha and 517.042 ha in the first hour. Furthermore, at the tenth hour rice area which
can be irrigated successively an area of 182.966 ha, 237.896 ha, 268.727 ha, 276.084 ha and
261.411 ha. Spillway using Ogee type summit with a summit height of 7.94 m and 1 m high
surveillance.

Keywords: small dam, water requirements, storage capacity