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PERENCANAAN SISTEM DRAINASE DI DAERAH ALIRAN SUNGAI (DAS) KALI DAPUR / OTIK SEHUBUNGAN DENGAN PERKEMBANGAN KOTA LAMONGAN Ichsan Rizkyandi; Bambang Sarwono; Yang Ratri Savitri
Jurnal Hidroteknik Vol 1, No 2 (2015)
Publisher : Institut Teknologi Sepuluh Nopember

Lamongan yang terus berkembang dari sebuah kabupaten menjadi sebuah kota menyebabkan Lamongan melakukan pembenahan di bidang infrastruktur. Bidang infrastruktur yang dibenahi salah satunya ialah sistem drainase. Pembenahan sistem drainase dilakukan karena banjir masih sering terjadi ketika hujan terjadi. Perencanaan sistem drainase ini dilakukan sehubungan dengan adanya Rencana Tata Ruang Wilayah (RTRW) Lamongan tahun 2011 - 2031. Perbedaan perencanaan pada tahun 2011 dan pada tahun 2031 dapat dilihat dari nilai koefisien pengalirannya. Perbedaan nilai koefisien pengaliran terjadi akibat dari adanya perubahan fungsi tata guna lahan di Lamongan pada tahun 2011 dan pada tahun 2031. Kali Dapur / Otik sebagai salah satu dari empat Kali yang berperan penting dalam sistem drainase Lamongan akan dievaluasi / direncanakan kembali. Evaluasi terhadap Kali Dapur / Otik bertujuan untuk mengetahui kapasitas penampang Kali Dapur / Otik dalam menampung debit rencana. Evaluasi dilakukan pada penampang Kali Dapur sepanjang ± 5,5 km. Dari hasil evaluasi yang dilakukan, penampang eksisting Kali Dapur / Otik belum mampu menampung debit banjir sehingga perlu dilakukan normalisasi. Normalisasi dilakukan dengan cara merapikan bentuk penampang dan kemiringan sungai tanpa mengubah elevasi dasar penampang eksisting di hilir Kali Dapur / Otik. Hal ini dikarenakan perencanaan normalisasi Kali Dapur / Otik tidak dilakukan secara keseluruhan melainkan hanya sepanjang ± 5,5 km. Oleh karena itu, normalisasi sepanjang ± 5,5 km dilakukan tanpa mengubah elevasi dasar penampang di hilir dengan tujuan agar tidak memengaruhi bentuk dasar penampang Kali Dapur / Otik secara keseluruhan. Selain itu, normalisasi Kali Dapur / Otik tidak dilakukan dengan memperlebar penampang dikarenakan adanya pemukiman dan jalan raya di sisi kanan maupun sisi kiri Kali Dapur / Otik sepanjang ± 5,5 km. Setelah normalisasi dilakukan, penampang Kali Dapur / Otik sudah mampu menampung debit banjir yang terjadi. Namun, penampang normalisasi belum memenuhi syarat tinggi jagaan sebesar 0,5 m. Oleh karena itu, diperlukan suatu tindakan penyelesaian untuk membantu Kali Dapur dalam memenuhi syarat tinggi jagaan. Tindakan yang dilakukan ialah dengan merencanakan suatu boezem di saluran Primer Sidoharjo dengan kebutuhan kapasitas tampung sebesar 359408,74 m3.

PERENCANAAN SISTEM DRAINASE PERUMAHAN THE GREENLAKE SURABAYA Riska Wulansari; Edijatno Edijatno; Yang Ratri Savitri
Jurnal Hidroteknik Vol 1, No 2 (2015)
Publisher : Institut Teknologi Sepuluh Nopember

Perumahan The Greenlake terletak di Jl. Raya Wiyung-Menganti, Surabaya. Kawasan ini dahulu adalah daerah irigasi sehingga terdapat saluran cacing (saluran irigasi). Pada saat ini saluran irigasi dialihfungsikan sebagai saluran drainase perkotaan. Saluran itu adalah saluran Taman Citra 1. Dalam sistem drainase perumahan The Greenlake, saluran ini diharapkan mampu untuk menampung limpasan air wilayah utara. Untuk kawasan The Greenlake wilayah selatan, direncanakan long storage melalui saluran sekunder (site drain). Langkah yang dilakukan untuk memecahkan masalah ini adalah perumusan masalah, perumusan metode yang digunakan dan pengumpulan data yang terdiri atas data hidrologi dan data hidrolika. Berdasar pada analisa data hidrologi yaitu data curah hujan didapatkan debit rencana. Selanjutnya, hasil perhitungan ini digunakan utnuk merancang dimensi saluran dalam sistem drainase perumahan The Greenlake, termasuk perhitungan kapasitas long storage dan saluran Taman Citra 1. Berdasar pada hasil perhitungan, dapat disimpulkan bahwa dimensi saluran tersier mempunyai dimensi lebar = kedalaman sebesar 0,50 meter; saluran sekunder 0,80 meter; saluran primer 1,00 meter. Fasilitas drainase yang dibutuhkan untuk long storage 1 meliputi dua buah pintu air dengan dimensi 1,20 meter x 2,00 meter dan satu buah pompa. Untuk long storage 2 meliputi satu buah pintu dengan dimensi 1,00 meter x 1,00 meter dan dua buah pompa. Normalisasi diperlukan pada beberapa penggal saluran Taman Citra 1 yaitu pada P4-P5, P7-P8, dan P8-P9.

Penerapan Low Impact Development (LID) Untuk Meminimalisir Genangan Yang Ratri Savitri
Jurnal Hidroteknik Vol 2, No 1 (2017)
Publisher : Institut Teknologi Sepuluh Nopember

Institut Teknologi Sepuluh Nopember ( ITS ) merupakan salah satu kampus yang eco lingkungan berada di Surabaya bagian timur. Luas area keseluruhan ± 180 ha yang terdiri dari bangunan, fasilitas umum dan ruang terbuka hijau. Berdasarkan kondisi eksisting saat ini, banyak lahan kosong yang nantinya akan dikembangkan sesuai dengan rencana Master Plan. Dengan adanya pengembangan tersebut akan mengubah lapisan tidak kedap yang awalnya dapat dimanfaatkan sebagai tampungan sementara atau sebagai daerah resapan maka akan berubah menjadi kawasan kedap. Perubahan tersebut akan mengakibatkan limpasan air hujan yang semula jatuh pada lahan kosong tersebut, sebagian akan meresap ke dalam tanah dan selebihnya dialirkan menuju saluran di sekitar. Maka, dengan adanya perubahan lapisan menjadi kedap akan memberikan dampak limpasan air hujan semakin besar untuk dialirkan menuju saluran drainase. Pada saat musim hujan, masih banyak terjadi genangan di beberapa tempat yang disebabkan oleh beberapa permasalahan diantaranya adalah saluran drainase yang belum terintegrasi dengan saluran bagian hilirnya sehingga air tidak dapat mengalir menuju pembuang akhir, kondisi street inlet yang tertutup oleh tanah dan sampah di beberapa lokasi mengakibatkan air hujan yang jatuh di jalan tidak dapat masuk ke saluran drainase, kapasitas saluran drainase yang kurang memenuhi, dll. Dengan adanya pengembangan kawasan, diharapkan tidak menambahkan beban seperti permasalahan yang telah diuraikan sebelumnya. Pada penelitian ini, akan dilakukan simulasi terhadap pengembangan kawasan dengan menerapkan Low Impact Development (LID). Proses simulasi akan dilakukan dengan menggunakan program bantu Storm Water Management Model (SWMM), dimana didalamnya terdapat beberapa alternatif LID yang dapat diterapkan dalam pengembangan kawasan. Dari hasil simulasi yang telah dilakukan, dengan menerapkan LID untuk beberapa tipe diantaranya adalah green roof dan permeable pavement untuk menurunkan debit limpasan.

The Effect of Low Impact Development Implementing on Flood Discharge of Outflow Drainage in the Lakarsantri District Surabaya City Habibur Rohman; Umboro Lasminto; Yang Ratri Savitri
Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan Vol 9 No 1 (2024): MARCH
Publisher : Program Studi Teknik Sipil, Fakultas Teknik, Universitas Islam Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30736/cvl.v9i1.1187

The drainage system in Lakarsantri District, Surabaya, applies a conventional drainage system which only focuses on water quantity. This is shown by flood events that occur in the area and downstream of the channel. A new paradigm in the management of drainage systems is a low impact development concept that focuses on conservation efforts and the use of natural features to carry out small-scale engineering to control surface runoff of rainwater in watersheds. This research aims to find a good model that can be applied with significant influence. This research was carried out by modeling using the SWMM application with 3 scenarios, scenario 1 Porous Pavement LID, scenario 2 Vegetative Swale LID, scenario 3 50% Porous Pavement + 50% Vegetative Swale LID. The results of the modeling show that scenario 1 has the effect of reducing surface runoff discharge by 0,385 ha-m, which in existing conditions has a surface runoff of 6,574 ha-m and then reducing to 6,189 ha-m with an installation percentage of 2,81% of the total area by the research location.

Analysis of Modernization Readiness of Irrigation in The Downstream Brantas River Basin Under The Authority of The Central Government Monique Adriana Swandani; Mahendra Andiek Maulana; Yang Ratri Savitri
Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan Vol 9 No 1 (2024): MARCH
Publisher : Program Studi Teknik Sipil, Fakultas Teknik, Universitas Islam Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30736/cvl.v9i1.1188

In carrying out the management of the irrigation system has obstacles are inadequate infrastructure conditions caused, the irrigation infrastructure has exhausted its technical age which causes the decline in the performance function of the irrigation network. Government to farmers has not been carried out intensively. In an effort to overcome these obstacles, in addition to the operation, maintenance and rehabilitation required a renewal thoroughly, both institutional, technical, managerial, and human resources. Modernization irrigation is an effort to realize a participant irrigation management system that is oriented toward fulfilling irrigation service levels in an effective, efficient, and sustainable. Limited time, cost and human resources are obstacles in the implementation of irrigation modernization, so an assessment is needed to measure the level of readiness of an irrigation area in carrying out irrigation modernization activities. This result of analyze the readiness of irrigation modernization show that Mrican Kanan area is ready for irrigation modernization with IKMI value 81,69%. Meanwhile DI. Mrican Kiri, DI. Siman, DI. Menturus, DI, Delta Brantas needs maintenance around 1- 2 years. DI. Mrican Kanan can start from the Peterongan Secondary Channel. SI. Pare Peterongan, SI. Tunggorono, SS. Melik dan SS. Sentul.

Channel Capacity Evaluation Model Using Storm Water Management Model Yang Ratri Savitri; Satria Damarnegara; Mahendra Andiek Maulana; Umboro Lasminto; Novi Andriany Teguh; Nastasia Festy Margini
Civilla : Jurnal Teknik Sipil Universitas Islam Lamongan Vol 9 No 2 (2024): SEPTEMBER
Publisher : Program Studi Teknik Sipil, Fakultas Teknik, Universitas Islam Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30736/cvl.v9i2.1315

Floods commonly occur in big cities with huge population densities. The increasing population number can cause a decrease in open land and green open space areas. It increases the surface runoff and induces inundation due to inadequate channel capacity. Therefore, a better design is required to minimize the inundation depth and area. This research aims to evaluate the drainage capacity of the channel dimension based on the flood discharge obtained from the rational method. The cross-section capacity was evaluated using the Storm Water Management Model by considering two types of rainfall distribution. The simulation result shows that the rainfall distribution influences the channel capacity. The flood discharge based on the Sri Harto distribution has a lower peak discharge than the Tadashi Tanimoto distribution. The result shows the significant effect of rainfall distribution types on the water depth. Therefore, it is necessary to determine the rainfall distribution method that represents the watershed characteristics used to design the drainage system.

Analisis Sensitivitas dan Kalibrasi Model Hujan Debit 1D Menggunkan SWMM Dhimas Krisna Wardana; Yang Ratri Savitri; Anak Agung Ngurah Satria Damarnegara
AGREGAT Vol 11 No 1 (2026)
Publisher : Universitas Muhammadiyah Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30651/ag.v11i1.31659

Rainfall-runoff modeling using the Storm Water Management Model (SWMM) is a widely adopted approach for representing urban drainage systems. In urban drainage modeling with SWMM, the accuracy of simulation results is greatly influenced by the sensitivity of model parameters and the calibration process that aligns with actual field conditions. Therefore, parameter sensitivity analysis is necessary to identify the parameters that most significantly affect simulation outcomes, so that an optimal model parameter configuration can be obtained to accurately represent actual flood conditions. This study aims to evaluate the performance of the SWMM model in representing rainfall-runoff processes in urban drainage systems based on sensitivity analysis and parameter calibration. Sensitivity analysis was conducted on several hydrological parameters, namely the Curve Number (CN), Manning's N, and the percentage of impervious area. The sensitive parameters identified were then used in the model calibration and validation process. Validation was evaluated qualitatively by comparing simulation results with actual conditions observed in the drainage network. The results of the sensitivity analysis indicate that the parameter with the greatest influence on surface runoff is the Curve Number (CN) at 5.3%, followed by the overland flow Manning's N at 2.0%, while the remaining parameters showed negligible effects. Regarding infiltration, CN demonstrated a dominant influence of 88.9%. Furthermore, the parameters affecting channel discharge were the channel Manning's coefficient at 42.3%, followed by overland flow N at 5.1% and CN at 2.2%. The calibration results confirm that the parameter configuration derived from the sensitivity analysis is capable of producing simulations that are consistent with actual field conditions.

MODEL HIDRODINAMIKA 1D-2D TERINTEGRASI UNTUK ANALISIS GENANGAN PADA SISTEM DRAINASE WONOREJO-RUNGKUT KOTA SURABAYA Irfan Adiputra Setiawan; Yang Ratri Savitri; Satria Damarnegara
AGREGAT Vol 11 No 1 (2026)
Publisher : Universitas Muhammadiyah Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30651/ag.v11i1.31673

Urban flooding is one of the main problems in the city of Surabaya due to the increase in built-up areas and land use changes that affect the urban drainage system. Based on previous research using Analytical Hierarchy Process (AHP) method, Wonorejo primary channel and Rungkut primary channel have the highest flood management priority scale in Surabaya city with values of 0.55 and 0.53, respectively. These conditions indicate the urgency of developing a model of the distribution of puddles in the drainage system Wonorejo-Rungkut. This study aims to analyze the characteristics and distribution of inundation using an integrated 1D – 2D hydrodynamic model in the drainage system Wonorejo – Rungkut with rain re-period of 10 years. Hydrological analysis was conducted using annual maximum rainfall data for the period 2010-2024. Furthermore, rainfall plan of study area is determined through frequency distribution analysis and thiessen polygon method. Modeling is done by integrating one-dimensional flow (1D) in the drainage channel and two-dimensional flow (2D) on the land surface using PCSWMM software. Before the calibration process, mesh sensitivity and model parameters are analyzed to obtain optimal and computationally efficient simulation configuration. The results showed that the mesh size of 15 × 15 m with sampling factor 3 was chosen as the optimal configuration. Manning Overland parameters have the greatest influence on the flow velocity and depth of the puddle, while the curve number (CN) has the most influence on the area and volume of the puddle. The calibration results of the model showed a Root Mean Square Error (RMSE) of 2.43 cm and Nash–Sutcliffe Efficiency (NSE) of 89.16%, so that the model is able to represent the puddle conditions well. The simulation results showed that inundation with a depth of more than 30 cm concentrated on the eastern side of the study area dominated by ponds, while residential areas dominated by inundation with a depth of less than 20 cm. Inundation in the settlement area is affected by the influence of backwater due to high water levels in the primary channel that causes the retention of flow in the secondary and tertiary channels

Pemodelan Hujan–Debit dan Genangan 2D untuk Analisis Banjir pada DAS Buntung, Kabupaten Sidoarjo Nur Izzah Elsa Nanda; Yang Ratri Savitri; Mahendra Andiek Maulana
AGREGAT Vol 11 No 1 (2026)
Publisher : Universitas Muhammadiyah Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30651/ag.v11i1.31715

Flooding is the most frequent natural disaster in Indonesia, accounting for 55.07% of national disasters. Sidoarjo Regency, particularly Waru District, is highly vulnerable to flooding caused by the overflow of the Buntung River. Flood inundation in the area may persist for up to two days with water depths reaching 30–40 cm. Rapid development of residential, industrial, and transportation areas within the Buntung Watershed has reduced infiltration capacity, while high rainfall intensity, tidal fluctuations, and downstream channel constriction further aggravate flooding conditions. Therefore, the development of a flood inundation model is essential to support effective flood mitigation planning.This study aims to analyze flood characteristics and inundation distribution for selected return periods. Hydrological analysis was conducted using annual maximum rainfall data from 2013–2024. Areal rainfall was determined using the Thiessen Polygon method and frequency distribution analysis. Rainfall–runoff modeling was performed using HEC-HMS to estimate flood discharge, while 2D inundation modeling was carried out using HEC-RAS 2D. Sensitivity analyses of mesh size, computation interval, and model parameters were performed prior to calibration to obtain an optimal and computationally efficient configuration.The results show that a 30 m mesh size and a 10-second computation interval provide the optimal simulation configuration. The Manning parameter has the greatest influence on inundation extent and flood depth. Model calibration produced NSE values of 0,724 respectively, indicating good model performance. The simulation results show that the 10-year return period flood inundation is predominantly characterized by water depths of <10 cm, accounting for 26.32% of the inundated area, followed by depths of 10–20 cm (22.58%), 20–30 cm (17.38%), 30–50 cm (22.27%), and >50 cm (11.45%). The inundation with depths greater than 50 cm is predominantly distributed in the downstream area of the Buntung River, which is influenced by tidal conditions.

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