Abstract
Road drainage is needed to prevent inudation as on Sempalwadak – Krebet Senggrong road Malang Regency. The inundation occurs as a result of uneven drainage construction so that the road becomes damaged and can distrupt people’s activities. The existing purpose of this thesis is to design an environmentally drainage and drainage canal, evaluate the hydraulic aspects of the drainage and drainage buildings, calculate construction costs, and plan scheduling. The data needed are topographic maps, rainfall data from the 3 closest stations: Blambangan, Bululawang, and Tangkilsari in 2010 until 2019, and the price of the Malang Regency work principal in 2020. The data is processed using the Gumbel I method, suitability test with Chi-Square method, and Smirnov-Kolmogorov by a period of 10 years, rain intensity with the Mononobe method and design flood discharge with the Rationel method. The calculation result the design rainfall is 109.63 mm/day; design flood discharge of 3.0807 m/second; environmentaly drainage using infiltration wells with dimensions of 0.7 meters with a depth of 1.8 meters; channel dimensions of 1 m x 1.2 m; construction costs of Rp. 7,797,328,046.09; construction duration 90 days.
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