Normalisasi Batang Agam Kota Payakumbuh yang telah dimulai dari tahun 2017, dengan pengembangan kawasan sepanjang normalisasi menjadi pusat wisata bagi Kota Payakumbuh dan sekitarnya. Terlepas dari pemanfaatan tersebut, tujuan awal normalisasi Sungai Batang Agam ini adalah untuk mencegah terjadinya banjir dikawasan sepanjang sungai. Untuk tercapainya tujuan pencegahan banjir penampang sungai seharusnya bersifat tetap. Salah satu yang sangat menentukan terjadinya perubahan penampang sungai adalah sedimen. Untuk itu dilakukan penelitian untuk mengetahui karakteristik sedimen dan debit sedimen di hulu dan di hilir kawasan normalisasi sungai Batang Agam. Karakter sedimen yang diuji pada penelitian ini adalah karakter mekanik dari sedimen, dan debit sedimen dihitung dengan metode Shen dan Hungs. Dari hasil pengujian karakter sedimen didapatkan kadar air terbesar adalah 12,21%, berat jenis rata-rata terbesar adalah 1,0294 N/m3. Sedangkan untuk hasil pengujian ukuran butiran, jenis sedimen sungai Batang Agam termasuk kepada jenis agregat halus. Untuk perhitungan angkutan sedimen di hulu dan di hilir normalisasi Batang Agam 46,551 kg/hari dan 137,264 kg/hari
The bridge structure calculation should be carried out in detail and thoroughly. Like any other civil buildings, bridges involve the livelihood of many people. So that a small mistake in planning can be fatal. The Air Koto Ilalang Bridge, which is located on the border of Payakumbuh – Baso, has an important role in connecting Bukittinggi, Limapuluh Kota and Payakumbuh as well as being part of the main connecting route between West Sumatra Province and Riau. Built in 1980, this bridge took a reconstruction in 2020. In this study, an analysis was carried out on the superstructure of the Koto Ilalang bridge with warren type of structure ; loading analysis, calculation of reinforcement for floor plates and the sidewalks, calculating the profile of the transverse girder and the main girder of the bridge. The results show that the bridge floor plate thickness is 30 cm. And the dimensions of the reinforcement on the floor slab are reinforcement 16 – 200 mm at the pedestal and the field. For stringers and transverse girders, steel structure profiles are used IWF 582.300.12.17 as stringers, IWF 900.300.16.28 as transverse girders, IWF 428.407.20.35 as main girders. Meanwhile, the deflection control obtained a value of 1.1224 cm, where this figure is still within the safe limit because the allowable deflection limit is 9 cm.Keywords: Steel, Bridge, Warren Trus, Stringer
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