Jumlah penduduk Kota Surabaya dari tahun 2014 sampai 2015 mengalami peningkatan sebesar 4,45%. Lahan pertanian di Kota Surabaya mengalami penyusutan lahan sebesar 75 hektar setiap tahunnya. Peningkatan jumlah penduduk Kota Surabaya berbanding terbalik dengan ketersediaan lahan pertanian. Solusinya adalah menerapkan konsep baru urban farming. Hasil optimasi eksisting menghasilkan intensitas tanam sebesar 289% dengan pola tanam padi-palawija-palawija, sedangkan optimasi rencana menghasilkan intensitas tanam sebesar 240% dengan pola tanam palawija-palawija (hidroponik tingkat atas), intensitas tanam sebesar 311% dengan pola tanam palawija-palawija-palawija (hidroponik tingkat bawah), dan budidaya ikan lele sistem bioflok. Kebutuhan air rencana sebesar 3,63x106 liter sedangkan ketersediaan tampungan air total sebesar 3,75x106 liter. Nilai Benefit Cost Ratio (BCR) eksisting dan rencana masing-masing sebesar 0,09 dan 1,43. Nilai Net Present Value (NPV) eksisting dan rencana masing-masing sebesar Rp-115.719.410,06 dan Rp2.956.052.297,26. Nilai Payback Period (PP) eksisting dan rencana membutuhkan 12,39 tahun dan 1,7 tahun.
Concrete is a composite material for it is consisted of some other materials, being mixed until homogen and monolith. But, however the mixture diversification or certain compaction method are being done, there is chance of bubbles or air pores occurance who degrade the design strength. Furthermore, concrete curing holds an important role for preventing the rush of initial cracks. The emerging of initial cracks follow concrete's volume-shrinkage, which is led by fast evaporation and the hydration process. This study observed concrete's compression strength, represented by six type of mashing-quantity, 0, 5, 10, 15, 20, 25 times of mashing per layer. Each type is represented by two samples. Samples made are cylindrical with 150 mm in diameter and 300 mm in length. Material specification is conventional industrial concrete K-250 with 120 mm slump. Samples were made by single mixing in Indonesia's average weather and temperature. After being molded, samples were stored in environmental ambiance (exposed by direct sun-ray, wind, etc.). From the experimental research, we're achieving the optimum compression strength of 20 times mashing per layer-sample, 15,09 MPa. The exposure of environmental ambiance reduces 30% of concrete's design strength. Kata kunci: kuat tekan, benda uji silinder, jumlah rojokan, paparan lingkungan.
Balong river is primary channel at Gunungsari drainage system with flood duration between 2-3 hours and flood elevation between 30-50 cm. Suspected cause of inundation due to poor drainage system and the backwater effect from sea. This needs to be done a study to solve the problem. To overcome it need to be taken into account several aspects of the hydrology, hydraulics and alternative problem solving. Calculation of flood discharge plan using rational method with flood discharge plan period Q5th for secondary channel and flood discharge plan period Q10th for primary channel. Based on the calculation of discharge in Balong Canal channel outlet of 65,66 m 3 /s. From the calculation results there are some channels that overbank including secondary channels Balongsari, Lontar, Darmo Indah, Darmo Satelit, The Main Channel Gunungsari and Balong Canal. To overcome it done redesign by increasing the width and height of the channel. Since the outlet of Balong canal primary channel ends to the madura sea is reckoned backwater due fluctuation sea water. From the results of backwater effect along 1.494,85 m. To overcome the backwater then planned boezem equipped with pumps and gate. From the calculations required Boezem area of 26.000 m 2 with a pump as much as 9 pieces of capacity of 2,5 m 2 /sec and water gate as much as 6 pieces with a width of 1,5 m high as 4,00 m. Kata kunci: Kali Balong, boezem, pompa air Abstrak Saluran Primer Kali Balong merupakan sistem Gunungsari yang banjirnya cukup tinggi dengan lama genangan antara 2-3 jam dan tinggi genangan antara 30-50 cm. Diduga penyebab genangan akibat buruknya sistem drainase yang ada ditambah dengan adanya pengaruh backwater. Hal ini perlu dilakukan kajian untuk menanggulangi permasalahan tersebut. Untuk menanggulanginya perlu diperhitungkan beberapa aspek yaitu aspek hidrologi, hidrolika dan alternatif pemecahan masalah. Perhitungan debit rencana menggunakan metode rasional dengan debit Q5 untuk saluran sekunder dan Q10 untuk saluran primer. Berdasarkan hasil perhitungan debit di outlet saluran Kali Balong sebesar 65,66 m 3 /det. Dari hasil perhitungan terdapat beberapa saluran yang meluber diantaranya saluran sekunder Balongsari, Lontar, Darmo Indah, Darmo Satelit, saluran primer Gunungsari dan Kali Balong. Untuk menanggulanginya dilakukan redesign dengan menambah lebar dan tinggi saluran. Outlet saluran primer Kali Balong bemuara ke Selat Madura maka diperhitungkan backwater akibat pasang surut air laut. Hasil perhitungan panjang pengaruh sepanjang 1.494,85 m dan untuk mengatasi backwater maka direncanakan boezem yang dilengkapi pompa dan pintu. Dari hasil perhitungan dibutuhkan Boezem seluas 26.000 m 2 dengan pompa sebanyak 9 buah kapasitas 2,50 m 2 /detik dan pintu air sebanyak 6 buah dengan lebar 1,50 setinggi 4,00 m untuk mengatasi banjir.
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