Environmentally sound approach for sustainable urban drainage could promote infiltration and lower the risk of flooding. This study presents the framework to evaluate the drainage alternatives considering multiple aspects including water quantity, life cycle cost and amenity. This approach is verified through application at a residential area in Malang city Indonesia. Different combinations of drainage components comprising of drainage channels, infiltration wells and biopore absorption holes are assessed regarding runoff reduction, present value of life cycle cost, and willingness to pay for the convenience. The first part describes the effective designs of sustainable drainage components in the houses as well as in the public spaces of the housing. The second part of this study describes the use of analytic hierarchy process for weight assignment of sustainability criteria and multiple benefit calculation. The study recommends infiltration wells and biopore absorption holes together with drainage channels as the best management practice of sustainable drainage system based on its overall sustainability index.

Sungai Petung yang berada di kecamatan Pasrepan, Kabupaten Pasuruan, Jawa Timur, memiliki panjang 14,34 km dengan luas DAS 158,30 km2. Kajian ini bertujuan untuk mengetahui angka kedalaman pemancangan sheet pile, angka keamanan stabilitas geser, guling, keruntuhan terhadap daya dukung, dan penurunan. Hasil kajian menunjukkan curah hujan rancangan yang terjadi pada sungai petung adalah sebesar 93.573 mm. Debit puncak kala ulang 25 tahun menggunakan software HEC-HMS sebesar 430,4 m3/dtk. Untuk hasil tinggi muka air dengan menggunakan software HEC-RAS pada kala ulang 25 tahun air yang meluap pada titik P 96 – P 74 dan P 4 – P 2. Bangunan pengendali berupa sheet pile beton sepanjang 2,5 Km dengan dimensi 1000mmx325mm.

In dry season Tarokan Sub-district of Kediri, often suffers from drought, so a small dam (embung) was required. The objectives of the study are to determine the dimension of the dam, its spillway and to analyze its stability. The required data were of rainfall, topographic maps, soil, and population.The initial design was hydrologic analysis by finding out the planned discharge Q50 and determining the water volume of inflow. To determine the effective catchment ponds, capacity analysis using topographical data and comparing the volume of water available. And analysis of spillway to determine the flood water level.The analyses result, the amount of the water needs of a population of 258.854.400m3, and the magnitude of the draft Q50 discharge of in 4.027 m3/sec (The  room  for  sediment  is  29,234.9 m3  at  elevation  1 m from the bottom of the pool); 390,000m3 effective capacity at +131.75 elevation, and flood water level at +132.75 elevation. The dimension of embung main dam is 6 m deep; embung crest at +133.00 elevation ; 3m wide embung crest ; 1:3 upstream slope; 1 : 2.25 downstream slope ; 10 m wide spillway channel 1 : 1 slope of wall of spillway channel ; and crest of spillway at +131.75. Geostudio software was used to calculate the figures safety against sliding. Keywords: embung, spillway, embung dimensions, slope stabilty

Gerigi weir is a modificated jigsaw weir which can hold water flow to gain higher water level. This water raising happens in upstream of the weir until certain length to reach normal depth. This research uses square open channel model with slope as an independent variable. In this research uses various slope from 1‰ to 5‰ for eight different discharges. The aim of this research is to find the impact of slope for backwater length using Direct Step Method. The result of this research is the longest back water happened in the 8th of experiment discharge (1399,984 cm3/sec) with the slope of 3‰, by 40.800,4952 cm from the weir. In addition, slope is not affect for the length of backwater. This is because from all analysis of experiments, the longest backwater happens in different slope for each discharge, namely between 1‰, 3‰, or 4‰ of slope.                      Keywords: back water, gerigi weir, slope

The channel along Jalan Letjen Sutoyo is a drainage channel that drains dirty water from the residential area of 0.65 km2. By evaluating the capacity and flow profile using the Storm Water Management Model (SWMM), it is hoped that flooding problems in the channel can be minimized. The capacity of the existing canal along Jalan Letjen Sutoyo is to accommodate a discharge of 13.62 to 29.09 m3/s so that we get the dimensions of a trapezoidal channel with a base width of 2.8 m with a height of 2.3 m at the beginning of the channel and becomes more extensive, namely a base width of 4 m with a height of 3.7 m. Enough capacity to accommodate a discharge of 29.09 m3/s. After the evaluation, it was found that there was accumulation at two points, namely J2 and J5, due to the maximum discharge added to the discharge from local settlements at that point. So it is necessary to redesign the channel to accommodate the discharge from the settlement. The redesign was only carried out by increasing the height of the channel to 5 m because increasing the width of the channel was not possible because the channel is in a densely populated area.ABSTRAKSaluran di sepanjang Jalan Letjen Sutoyo merupakan saluran drainase yang mengalirkan debit air kotor dari daerah Kawasan permukiman seluas 0,65 km2. Dengan membuat evaluasi pada kapasitas dan profil aliran dengan menggunakan Storm Water Management Model (SWMM) diharapkan permasalahan banjir pada saluran tersebut dapat diminimalisir.  Kapasitas saluran eksisting sepanjang Jalan Letjen Sutoyo adalah untuk menampung debit 13,62 hingga 29,09 m3/dt. Sehingga didapatkan dimensi berupa saluran trapesium dengan lebar dasar 2,8 m dengan ketinggian 2,3 m di awal saluran dan menjadi lebih besar yaitu lebar dasar 4 m dengan ketinggian 3.7 m. Kapasitas yang cukup untuk menampung debit sebesar 29,09 m3/dt. Setelah di evaluasi maka ditemukan adanya penumpukan pada dua titik yaitu J2 dan J5, akibat debit maksimum ditambahkan dengan debit yang berasal dari pemukiman setempat pada titik tersebut. Sehingga perlu adanya redesain saluran agar dapat menampung debit dari pemukiman. Redesain hanya dilakukan dengan penambahan ketinggian saluran menjadi 5 m, karena untuk penambahan lebar saluran tidak memungkinkan, karena saluran berada di wilayah padat pemukiman.