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Hanafi Ashad
lecture in master civil engineering at indonesian moeslim university
Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Engineering Industrial & Manufacturing Engineering Transportation

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STUDY OF FUND ALLOCATION FOR MAKASSAR CITY DRAINAGE CHANNEL MAINTENANCE: Case Study Bumi Tamalanrea Permai District. Tamalanrea Hanafi Ashad; Abd Karim Hadi; Suryanti Adnan
UNDERPASS Journal of Civil Engineering, Applied Sciences, and Technology Vol. 4 No. 2 (2020): JURNAL FLYOVER Volume 4 Issue 2 November 2020
Publisher : Moeslim Indonesian University (UMI)

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Abstract

Bumi Tamalanrea Permai Housing is a housing development that began to be developed in 1990. Many lands that were originally water catchment areas have now been converted into residential, industrial, office and trade areas. During the rainy season with maximum rainfall in the Tamalanrea Permai Earth Area (BTP), extensive inundation occurs. This condition is strongly influenced by the capacity of the channel, how much sedimentation is and how much the maintenance costs for the existing drainage channel are. The objectives of this research are 1) To know the optimization of drainage channel capacity in the BTP Tamalanrea area based on hydrological analysis and hydraulics analysis. 2) Knowing the capacity of the drainage channel due to sedimentation. 3) Knowing the financing of drainage channel maintenance. The research method used is survey method, case study which contains a review of real conditions through field observations accompanied by analysis based on existing methods or formulas. The research design includes site survey, primary and secondary data collection, data analysis and design of culvert drainage dimensions based on hydrological and hydraulic analysis. The research area is divided into 4 (four) segments. The results show that 1) Optimization of drainage channel capacity based on hydrological and hydraulic analysis where the existing discharge must be greater than the design discharge (Qeks > Qrenc) has met, the results show that each segment shows Qeks > Qrenc which means the drainage is functioning and needs maintenance. 2) The presence of sedimentation causes the channel capacity to be smaller, so dredging must be carried out throughout the channel. 3) Based on all the results of the analysis and calculations carried out, the amount of costs required for maintenance activities is obtained by referring to the applicable regulations.
CASHFLOW PLANNING ON THE BULUKUMBA STATE COURT BUILDING PROJECT PHASE II Wudi Darul Putra; Hanafi Ashad
UNDERPASS Journal of Civil Engineering, Applied Sciences, and Technology Vol. 2 No. 1 (2018): Journal Flyover Vol 2 Issue 1 Juni 2018
Publisher : Moeslim Indonesian University (UMI)

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Cashflow planning is inseparable from scheduling conditions which include EST (earliest start time) or the earliest project start time, LST (latest start time) or the slowest project start time, and the use of non-critical activity floats which are a combination of the two, where activities in the project is collected in the middle. Thus, it is necessary to conduct a study to further examine cash flow planning in a construction project to obtain an optimal cash flow concept, which in the end can obtain maximum profit. This study aims to [1] Optimal cash flow planning in order to obtain maximum profit, from the payment model without a down payment, scheduling conditions for EST, LST and Optimum Shift. [2] Optimal cash flow planning in order to obtain maximum profit, with 20% down payment and 30% down payment, scheduling conditions for EST, LST and Optimum Shift. [3] Get a Project Scheduling scenario that can generate optimal cash flow, in other words the cash flow that generates the greatest profit. The results showed that [1] Conditions Without Down Payment with Monthly Payments, resulted in 9.29% Profit, the largest Overdraft was Rp. 1,533,680,766.00 CV =+, SV=+. [2] Conditions with 20% down payment and payment terms according to progress, resulting in 9.29% Profit, the biggest Overdraft Rp 848,581,656.00 CV =+, SV=+. [3] For conditions with 30% down payment and payment according to the progress terms, it generates 9.29% Profit, the largest Overdraft is IDR 586,319,072.00CV =+ , SV=+. And [4] Downpayment can indirectly affect profits, if when an overdraft occurs, the contractor cannot have sufficient funds so that they have to borrow funds from a third party, resulting in fluctuating interest expenses.
Roughness (MANNING) COEFFICIENT VALUE STUDY WITH HEC-RAS SOFTWARE VERSION 4.0 Ratna Musa; Hanafi Ashad; Trifandy Musafir Wellang
UNDERPASS Journal of Civil Engineering, Applied Sciences, and Technology Vol. 2 No. 1 (2018): Journal Flyover Vol 2 Issue 1 Juni 2018
Publisher : Moeslim Indonesian University (UMI)

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Abstract

Swadaya ponds are located in Lamasi District, Luwu Regency, South Sulawesi Province with a total area of ​​384 hectares of ponds. The Swadaya pond drainage system consists of a carrier channel and a discharge channel with water sources for irrigating the pond area obtained from fresh water sources taken from the Central Minanga river and salt water sources taken directly from the sea (Teluk Bone). The simulation was carried out on the Swadaya pond channel in Luwu Regency with Unsteady conditions using the HEC-RAS 4.0 software (Hydrologic Engineering Center-River Analysis System) issued by the US Army Corps of Engineering. What is reviewed with various quantities of Q80 and Qmin annual discharges for upstream Boundary Conditions and for downstream conditions using the influence of tidal changes, this is to find out how big the hydraulic changes are in the Swadaya pond channel. From the simulation for the boundary conditions Q80 and Qmin shows that: The greater the discharge in the upstream channel conditions, the greater the discharge, velocity, and depth of flow in the channel. At high tide, the flow discharge from upstream (Central Minanga River) to the primary carrier channel is smaller than at low tide. Meanwhile, the discharge that enters the secondary channel is greater when the water is in high tide. As for the effect of the Manning coefficient on discharge, time and distance, the smaller the discharge (Qmin = 13.99 m3/s) in upstream conditions, the effect of high tide will be greater and the distance from downstream will be further (s = 2680.64 m) and the greater the discharge (Q80 = 21.37 m3/s) in the upstream, the smaller the influence of the tide and the closer the distance from the downstream (s = 2665.33 m). In order for the availability of water to meet the needs of pond water in the Swadaya pond channel, a trial and error test is carried out on the slope of the secondary and tertiary canals.
Co-Authors Abd Karim Hadi Ratna Musa Suryanti Adnan Trifandy Musafir Wellang Wudi Darul Putra