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All Journal DEARSIP: Journal of Architecture and Civil
Annisa' Carina
S1 Teknik Sipil Universitas Islam Darul ‘Ulum Lamongan
Civil Engineering, Building, Construction & Architecture

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DRAINAGE ANALYSIS AND PLANNING IN FLOOD PREVENTION EFFORTS IN GRAND MADANI MOJOKERTO HOUSING Heru Setiyo Cahyono; Chairumin Alfin; Nur Latifah Khomsiati; Annisa' Carina
DEARSIP : Journal of Architecture and Civil Vol 5 No 02 (2025): Juli - November 2025
Publisher : Faculty of Engineering, Universitas Islam Darul Ulum Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52166/dearsip.v5i02.10846

Abstract

This study analyzes flood levels for the 2025 re-period in the Grand Madani Housing area, Gunung Gedangan Village, Mojokerto City. The study includes hydrological and hydraulic analysis using 10 years of rainfall data (2014 – 2023) from Mojosari Station, topographic analysis (Sungai Sadar watershed) and soil type (Sub – Sadar watershed), as well as drainage design based on the Rational method, HEC – RAS,. The rainfall distribution was tested using the Log Normal, Pearson Log Type III, and Gumbel methods, and tested for compatibility with the chi-square test. The results showed that the distribution of Pearson Log Type III was most consistent with the data (kurtosis statistical value γk = 3.247). The planned rainfall for T = 2 years is 165.7 mm, and T = 100 years is 329.3 mm (Normal Log), which is used to calculate the rainfall intensity (Talbot, Ishiguro, Sherman method) and the planned flood discharge by the Rational method (Q = 0.278· C·Cs· I·A). The planned flood discharge obtained is 9,399 m³/s, greater than the existing channel capacity of 8,053 m³/s, so channel replanning is required. Hydraulic simulations using HEC – RAS 5.1 showed that the proposed drainage design (30 cm × 40 cm cover box) was able to accommodate the design rainfall (25-year re-period) without overflow. The study contributes to residential flood mitigation through the calculation of adequate plan discharge and drainage design recommendations, as well as the use of hydrodynamic models to ensure the performance of the channel to the standard.
ANALYSIS AND DRAINAGE PLANNING IN FLOOD PREVENTION EFFORTS AT MAHROJA COMMERCIAL CENTER TASIKMALAYA Chairumin Alfin; Heru Setiyo Cahyono; Nur Latifah Khomsiati; Annisa' Carina
DEARSIP : Journal of Architecture and Civil Vol 5 No 02 (2025): Juli - November 2025
Publisher : Faculty of Engineering, Universitas Islam Darul Ulum Lamongan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52166/dearsip.v5i02.10847

Abstract

Drainage analysis and planning in an effort to prevent flooding at the Mahroja Commercial Center Tasikmalaya was carried out with a hydrological analysis method in the Cimulu River Sub-watershed, Tasikmalaya City, to estimate the planned rainfall and flood discharge for the 25-year plan. Daily rainfall data during 2007–2019 from the nearest stations (Cimulu, Cikunten II, Kawalu) were analyzed by arithmetic method to obtain the average rainfall of the area. Statistical frequency analysis was carried out by checking the match of the probability distributions of Gumbel, Log – Normal, and Log – Pearson Type III. Based on the chi-square test, it was obtained that the Type III Log-Pearson distribution provided the best match. The 25-year planned rainfall ranges from 124.48 mm (Normal), 137.74 mm (Gumbel) to 159.33 mm (Log – Pearson). The intensity of peak rainfall was calculated from the IDF (Intensity–Duration–Frequency) curve and used in the Rational method (Q = 0.278· C·I·A) to calculate the plan discharge. The hydraulic model of the regional drainage channel (Mahroja Commercial Center) was made with EPA SWMM 5.1 software (25-year planned rainfall input, DTA 18.8 ha). The results of the SWMM simulation show the value of the planned flood discharge at vital locations (namely: C8 shopping complex of 0.877 m³/s, about 37.8% of the capacity of 2.3196 m³/s; peak in channel C10 of 2.496 m³/s, 59.3% of the capacity of 4.2057 m³/s). This condition indicates that the commercial drainage system is safe against 25 years of flooding. The results of this study are important as a technical basis for flood mitigation in the Cimulu Sub-watershed – namely: planning vulnerable areas and increasing drainage capacity – so that the burden of large rainfall can be reliably overcome.
Co-Authors Chairumin Alfin Heru Setiyo Cahyono Heru Setiyo Cahyono Nur Latifah Khomsiati