Abstract
On West Bandulan Junction Street - Brigjend Katamso Street, Malang City often experiences inundation during the rainy season. The occurrence of flooding is caused by the capacity of the drainage channel which is not sufficient to accommodate the discharge of runoff, improper drainage planning garbage in the drainage channel, the amount of waste from households and industry and the large number of closed drainage channels because it is made for parking and community home yards . From this condition, the drainage re-design is carried out. This plan is made to re-design the dimensions of the drainage channels and calculate the WWTP (Wastewater Treatment Plant) requirements, as well as calculate the RAB. The results of the calculation of the planned channel dimensions are trapezoidal and square with the largest dimensions of the trapezoid having a width of 1.19 m, a bottom width of 0.8 m and a height of 1.09 m. while the largest dimension of a square has a width of 1.4 m and a height of 1.4 m. The results of the calculation of the need for WWTP require 4 WWTP with different capacities, namely IPAL 1 with a capacity of 4 m3, IPAL 2 with a capacity of 12 m3, IPAL 3 with a capacity of 3 m3, IPAL 2 with a capacity of 2 m3. Based on the results of the calculation of drainage redesign, it can be concluded that the cost of redesign the drainage and WWTP is Rp. 6,473,335,422.
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