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All Journal JURNAL TEKNIK HIDRAULIK J-Sil (Jurnal Teknik Sipil dan Lingkungan)
Chumaedi, Irpan
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Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Engineering Environmental Science Transportation

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Utilization of HEC DSS and HEC SSP Software for Rainfall Frequency Analysis in Drainage System Design for City’s Industrial Area Rahayu, Diana; Rizal, Risdiamon; Chumaedi, Irpan
Jurnal Teknik Sipil dan Lingkungan Vol. 10 No. 1: April 2025
Publisher : Departemen Teknik Sipil dan Lingkungan IPB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jsil.10.1.179-192

Abstract

The analysis of designed rainfall frequency is a key input in various designing in the field of hydraulic engineering, such as floodplain mitigation, water structure construction, and flood inundation mapping. The calculation of rainfall frequency analysis still largely uses Microsoft Excel-based statistics that are calculated manually. The purpose of writing this article is to utilize HEC DSS and HEC SSP software in analyzing rainfall frequency at the measurement location. Measured rainfall data collected from the BMKG Hang Nadim rain station over the past 12 years has been inventoried in the HEC DSS and descriptions have been inputted in sections A to F. Then the data that has been input into HEC DSS will be integrated with HEC SSP. By plotting rainfall data at HEC SSP and running an analysis of the rainfall data, the rainfall frequency analysis at the measurement location was obtained. From running the HEC SSP with Normal, Log-Normal, Gumbel, and Log-Pearson III rainfall distributions, the distribution fit tests using the Kolmogorov-Smirnov method yielded the smallest error value for Log-Pearson III at 0.149 and for the Anderson-Darling method at 0.176. Therefore, the rainfall frequency analysis used is based on the Log-Pearson III rainfall distribution. Where the rainfall design values for return periods of 2, 5, 10, 20, and 50 years are sequentially 118.434 mm/day, 172.94 mm/day, 217.94 mm/day, 268.73 mm/day, 355.81 mm/day, and 442.90 mm/day. The rainfall frequency analysis results are used as input data to compute the flood discharge recurrence interval with the Rational methode. Using a flood discharge with a 10-year return period (Q10) and a concrete channel, the proposed drainage channel dimensions of 0.80 m and 1.20 m were determined.
Analisis Luas Wilayah Genangan dan Tinggi Banjir pada Proyek Rencana Kegiatan Superblok Kota Batam Menggunakan Aplikasi HEC-RAS 2D Rahayu, Diana; Dewi, Endang Purnama; Purbakawaca, Rady; Rahayu, Sri; N/A, Elviana; Chumaedi, Irpan
JURNAL TEKNIK HIDRAULIK Vol 16, No 2 (2025): Jurnal Teknik Hidraulik
Publisher : Direktorat Bina Teknik Sumber Daya Air, Kementerian Pekerjaan Umum dan Perumahan Rakyat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32679/jth.v16i2.840

Abstract

Floods are an annual disaster that disrupt public services and cause financial losses. Climate change and urbanization are the main factors contributing to increased rainfall which challenges the capacity of conventional drainage systems. The aim of writing this article is to analyze the depth, inundation area and flow direction in the superblock development plan using HEC-RAS 2D hydraulic modeling. The method used is to combine hydrological analysis, namely calculating the rainfall distribution using the Gumbel method, with hydraulic modeling. Hydrological analysis is conducted to calculate the frequency analysis of return periods and peak flood discharge. The return period rainfall using the Gumbel method for a 5-year return period (R5) is 212.921 mm. The flood discharge was calculated using the Rational method with catchment area 12.96 ha, resulting in Q = 1.08 m³/s. In calculating the Rational peak discharge, a rainfall intensity value is needed. The rain intensity required in the Rational method calculation uses the IDF curve to obtain a value of 100.6 mm/hour. The rain intensity value is then processed using an equation and the planned peak discharge is produced. Then peak flood discharge data is inputted and simulated using two-dimensional hydraulic modeling with HEC-RAS version 6.3.1 to obtain flood water surface profiles, inundation area and flow direction. The height of the flood inundation resulting from twodimensional hydraulic modeling using HEC-RAS 6.3.1 is 42 cm, the inundation area is approximately inundation area is around 8.5 ha, and the flow direction during flooding is towards the east of the project site.
Co-Authors Dewi, Endang Purnama Diana Rahayu, Diana N/A, Elviana Purbakawaca, Rady Rizal, Risdiamon SRI RAHAYU