Flood Discharge Plan Research Articles

The Identification of River Flow Capacity using the HEC-RAS 1D Model: Case Study of Sringin River Downstreamdy of the Sringin River Downstream

The Sringin is a downstream river located in East Semarang. The Sringin River becomes the channel waste of the East Semarang district area. The Sringin River bank is surrounded by the Terboyo industrial area and settlement. The flood occurred in both areas, especially at Ngilir village, Genuk subdistrict. It is caused by low-capacity sedimentation channels and buildings occupying the channel body. The study aims to estimate flood discharge during repeat period 2, 5, 10, 25, 50, and 100 years on Sringin river downstream, analyze the capacity cross-section river, and identify the river water level profile when debit flowed with various period repeat flood. The hydrology calculation showed that flood discharge plans in the repeat period 2, 5, 10, 25, 50, and 100 years are 12.42; 16.67; 19.81; 30.7; 31.6; 33.22 m 3 /s. At the same time, the flow river capacity is 2.95 m³/s in the upstream section and 15.52 m³/s in the downstream section. Thus, floods occurred in some places when large discharges flowed. In period 2, the water level is about 1.0 to 1.5 meters. In more repeat periods, the level is higher. The conclusion is that the Sringin River cannot flow with perfect discharge, which exceeds its flow capacity.

Analisis Hujan Ekstrim Probable Maximum Precipitation (PMP) menggunakan metode Hersfield dan Perhitungan Debit Banjir

Extreme rain is rain with the lowest intensity of 50 mm/24 hours or 20 mm/hour. River is an elongated surface water flow and flows from a higher place (upstream) to a lower place (downstream). The area of KIuet is 1429.93 km and the area of Kluet River is 163.51 km2 and the length of the river is 68.26 km. The problem is that Kluet Utara River experiences high rainfall, resulting in overflows that flatten agricultural land and submerge residential areas. The purpose of the study was to calculate the planned return period rainfall, analyze the PMP (probable Maximum Precipitation) value and analyze the flood discharge to evaluate the PMF (Probable Maximum Flood) value and the return flood discharge. The benefits of this research are used to see the PMF value and return period rainfall to analyze the frequency of flooding KIuet Utara Watershed (DAS). The scope of the research was to calculate rainfall and flood discharge in KIuet Utara Watershed and secondary data which includes 10 years rainfall data obtained from BMKG (Meteorology, Climatology and Geophysics Agency) Indrapuri Aceh Besar and watershed maps obtained from PT. Mediatama Indoconsult. Processing of rainfall data on return period used Log Pearson III Method and PMP used Hersfield Method while calculating the planned flood discharge using Melchior Method. The results of the research is the rainfall value for the return period for the lowest rainfall in the 2 year return period is as high as 211,836 mm and the highest rainfall for the 1000 year return period is 566,239 mm, so that the flood discharge plan for the return period for the lowest flood discharge in the 2 year return period is equal to 2061,342 m3/s and the highest flood discharge at the 1000 year return period is 5510,490 m3/s. The PMP value was obtained at 2128,432 mm so that the PMF was obtained at 20714,772 m3/s. Log Pearson III and PMP methods can be used to calculate the rainfall in KIuet Utara and the results from the rainfall are used to calculate the planned flood discharge using Melchior Method.

ANALYSIS OF FLOOD HYDROGRAPH IN THE LANDAK SUB WATERSHED

This research is motivated by the natural flooding disaster in the Landak sub-watershed area, which can be caused by river overflow due to high rain intensity. Flood discharge can be calculated using the Synthetic Unit Hydrograph method if the available data is limited, such as only obtaining rainfall data and watershed characteristics.Several Synthetic Unit Hydrograph (SUH) methodologies, including SUH Snyder, Nakayasu, Soil Conservation Services (SCS), Gama I, ITB, and Limantara, were utilized in this study. The analyzed data included precipitation data and measured discharge data. Rainfall data are analyzed using the homogeneity test, statistical descriptors, and chi-squared to determine the planned flood discharge. Then, continue with the study of rainfall frequency and analysis of rainfall intensity so that the maximal discharge can be analyzed using three SUH methods: HSS Snyder, Nakayasu, and SCS. The analysis of measured release is conducted by statistically analyzing estimated discharge data.The analysis results are then compared to obtain the percentage error between the discharge plan and the minimum measured discharge. The results showed that the HSS Snyder method was selected for analyzing flood discharge in the Landak sub-watershed basin because it has the minimum percentage error from comparing planned release and measured discharge values. Therefore, for the calculation of flood discharge analysis of the Landak sub-watershed basin, the HSS Snyder method is used with the acquisition of flood discharge plans for the return period of 2, 5, 10, 20, 50, and 100 years of 648,880 m3/sec, 896,335 m3/sec, 1025,954 m3/sec, 1132,006 m3/sec, 1252,788 m3/sec, 1335,273 m3/sec.

STUDI PENERAPAN KONSEP EKO HIDRAULIK UNTUK MITIGASI BANJIR DI SUNGAI PULISAN

The analysis began by finding the frequency of rain using the Log Pearson III method. The rain data used came from two rain posts, namely the Araren-Pinenek MRG rain post and the Maen Climatology rain post. The rainfall data used is the maximum daily rainfall data from 2002 to 2019. Rain flow modeling on the HEC-HMS komputer program using the HSS Soil Conservation Services method, and for water loss with the SCS Curve Number (CN). For baseflow using the recession method. HSS SCS parameter calibration was performed before simulating flood discharge using peak discharge test. The calibrated parameters are lag time, curve number, recession constant, initial discharge and ratio to peak. For the limits of each parameter is adjusted to the standard values in the HEC-HMS komputer program. The peak discharge test results show 2.2 m3 / second. Then a flood discharge analysis was carried out with calibrated parameters using the HEC-HMS komputer program. The peak discharge results simulated each time are re-entered in the HEC-RAS komputer program, then simulating flow profiles including flow velocity and high elevation of the water table. The flood discharge plan used is the 25 years period of 24,5 m3/second by installing several Eco Hydraulic constructions such as vetiver grass, bush grass, bamboo plants, logs, and a combination of vetiver grass and logs. The flow speed of the existing cross-section with the application between vetiver grass and logs can be reduced by 62%. With the use of Eco Hydraulics, it can reduce and optimize flow speed and looks aesthetic considering Pulisan is a superpriority area

FREQUENCY ANALYSIS OF DELI RIVER FLOOD DISTRIBUTION PLAN USING THE GUMBEL PROBABILITY DISTRIBUTION METHOD

The Deli river basin is one of the rivers in North Sumatra Province which is in Medan City with an area of ​​394.88 km2 and a length of 166.01 km. Medan Maimun District which has an area of ​​2.98 km2 and a population density of 16,520 people/km2. Medan Mimun sub-district is one of the flood-prone areas which is drained by the Deli River. The cause of the flooding that occurred in Medan Maimun District was high rainfall so that the river flow rate increased and drainage was poor. So that the problem of flooding in the Deli river watershed, Medan Maimun sub-district, can hamper community activities, these floods can also harm and endanger the community. The flood discharge plan for each repeat period where the variable used is the maximum daily rainfall for 10 years From 2013-2022 which is sourced from the BMKG Deli Serdang. In this study using frequency analysis and then proceed with the Gumbel Probability Distribution method, Normal Distribution Log Person Type III. The result of this study with hydrological data and distribution test, the suitable method for analyzing the planned flood discharge in the Deli River is Log Person Type III that it can be flood discharge for a 2 year retention period is 12.7684672 m3/sec, 5 year return period is 12.56275855 m3/sec, 10 year return period is 15.91400029 m3/sec, 25 year return period is 16.87871678 m3/sec, 50 year return period is 17.43836748 m3/sec and a 100 year return period is 17.89619614 m3/sec.
 
 Keywords: Rainfall, Deli River, Planned Flood Discharge

The area of flood run-off with HEC-RAS modeling in Cabang Dua River, Manokwari Regency, West Papua Province

Wosi watershed is one of the watersheds with a Classification Restored Carrying capacity, and it is also indicated to have decreased hydrological function. this study aims to find out the extent of the flood discharge plan/peak runoff (m3/s) and plan/peak of the flood affected (ha). This research was conducted in 3 months (September - November 2020). The observed object is Cabang Dua river Wosi, in Manokwari, West Papua. The data of the research results are analyzed descriptively quantitatively with the technique of interpretation and analysis of maps. The results showed the value of flood discharge plan on repeat 2, 5, 10, 25, 50, 100 years respectively are 89.05 m3/s, 118.50 m3/s, 128.46 m3/s, 135.01 m3/s, 137.57 m3/s, and 138.94 m3/s. It is known that Cabang Dua river is unable to accommodate the discharge and causes flooding at any time (2-100 years) with successive areas of 13.88 ha, 14.36 ha, 14.52 ha, 14.60 ha, 14.67 ha, and 14.71 ha.

Evaluation of Flood Control Performance in the Talangsari Watershed, Samarinda, East Kalimantan

The flood issues in the Talangsari River in Samarinda City were not only caused by high rainfall but also by the significant sediment accumulation and waste along the river, the encroachment of residential areas onto the river section, and the lack of public awareness regarding environmental cleanliness. As a result, flooding occurs throughout the Talangsari River, from upstream to downstream, indicating significant damage to the river. Considering these issues, proactive measures are necessary to address the flood problems. One such measure is the normalization of the Talangsari River to ensure smooth land transportation from and to Apt Pranoto Airport in the Sei Siring area, Bontang City, Sangatta, and Kutai Kartanegara. The flood discharge plan was estimated using Nakayasu and SCS synthetic unit hydrograph method. The analysis revealed a peak discharge of 6.39 m3/s for the existing conditions (2-year return period) and 13.38 m3/s for the normalization conditions (25-year return period). Subsequently, the simulations were performed using the HEC-RAS program by two scenarios: the existing river condition and the normalization scenarios. Following the simulation with the 2-year return period discharge for the existing conditions, the Talangsari River experienced upstream to downstream flooding, underscoring the need for flood mitigation measures. The river normalization simulation using the 25-year return period discharge considered dimensions such as a channel width of 7m and a depth of 3.5m. As a result of the normalization simulation, the Talangsari River successfully accommodated a flow of 13.38 m3/s without experiencing flooding, confirming that the decision to pursue normalization was the best choice.

Evaluation on Merauke Drainage System in Overcoming Flood-Prone Areas

Merauke city suffers flooding in almost every rainy season, which endangers the environment and disturbs<br />people's activities. One of the worst floods happened in 2019, where flooding damaged vegetables and crops, impacted<br />the city's economy, and later caused economic inflation. Therefore, a study evaluating the drainage system in Merauke<br />city is needed to overcome this issue. This study was conducted through a field survey and literature study with data<br />that varies from hydrological, elevation, and hydraulics data. Hydrological data includes yearly rainfall data, and<br />hydraulics data consists of the drainage network and designs. This evaluation will then result in the normalization of a<br />drainage system. This study found that the capacity of the current drainage system is 10.815 m3/s, where this drainage<br />capacity cannot accommodate the amount of flood discharge plan. Also, the existing drainage system is missing a<br />component that was not built in the first place, affecting the drainage's capacity. Therefore, a normalization of the<br />drainage system is needed to avoid flooding.

Ciliwung river normalization analysisusing HEC-RAS application (TB. Simatupang Bridge to Bidara Cina)

<p>Ciliwung River area which starts from TB. Simatupang Bridge to Bidara Cina is one of the areas that experienced severe flooding.This is caused by changes or conversion of land functions which were originally a water catchment area into settlements. Buildings that stand along the river body makes the current cross section of the Ciliwung River unable to function optimally in accommodating flood discharges. In addition, there is no public awareness in protecting the environment, it can be seen from the large piles of garbage on the riverside of the Ciliwung River.One of the efforts made by the government in flood control is river normalization, but in practice the normalization of the Ciliwung River can be said to be not running optimally. The purpose of this research is : the Author want to know how big the capacity of Ciliwung River existing cross section (starting from TB Simatupang Bridge to Bidara Cina) using Hec-Ras software application to modeling the river’s cross section existing and so does recording and mapping ofpotentialflood locations<em>.</em><em> </em>Based on the hydrology calculation, known that flood discharge plan Q<sub>25</sub>is 404.3m<sup>3</sup>/s, while the hydraulic Q is only 79.03 m3/s, the Q total is 483,38 m<sup>3</sup>/s. The results of modeling using the <em>Hec-Ras</em> river cross section existingcannot accommodate the planned flood discharge so that river normalization efforts are needed. Recording and mapping flood locations are useful to get the effectivity of River’s normalization according to flood controlling at Ciliwung River (specific at TB Simatupang Bridge to Bidara Cina).</p>

Flood Discharge Analysis Using the SCS Hydrograph Method in the Krung Tripa Watershed

The purpose of this study was to analyze the flood discharge of the krung Tripa river re-period plan and flood behavior based on hydrographic data obtained from rainfall data and estimate the magnitude of peak flood discharge. Flooding is the main problem caused by the overflow of Krung Tripa, with administrative Krung Tripa passes through 2 (two) districts in Aceh Province, namely in Nagan Raya regency in the area of the watershed (DAS) reached 3472.95 Km. Several factors cause flooding, including slope factors and land height of an area, soil type factors land uses. The method used to analyze flood discharge is the Scs Hydrograph method using secondary data. The results of flood discharge analysis obtained flood discharge plans for a 2-year re-period of 2464.033 m3/s, a 5-year re-period of 3597.893 m3/s, in are-period of 10 year obtained the planned flood discharge for a 2-year re-period was 2464.033 033 m3/s, 5-year re-period 3597.893 m3/s, in the 10-year re-period 4372.634 m3/s, in the 25-year re-period 5377.98 m3/s, in the 50-year-old period 6153.054 m3/s, in the 100-year-old re-period 6946.462 m3/s.

Effects of flood discharge on the water quality of a drinking water reservoir in China – Characteristics and management strategies

Stormflow runoff is an important non-point source of pollution in drinking water reservoirs. Rationally managed flood discharge processes at estuaries can reduce the high concentration of pollutants carried by runoff, and thus their impacts on water plant operations. In this study, the physical and chemical water quality parameters upstream from a dam were measured for a flood discharge process in the Jinpen Reservoir of Northwest China. The results showed that the time needed for the flood to reach the reservoir was ∼9 h after flooding began, and this lag effect meant that water in the metalimnion and hypolimnion were vented in advance. Consequently, the undercurrent intruded into the hypolimnion. The water temperature increased by 1.83 °C, and the Schmidt stability index decreased from 3291.37 J m−2 to 2496.32 J m−2. Flood discharge can effectively reduce the volume of pollutants; however, it cannot completely prevent the deterioration of water quality in the main reservoir. The turbidity of the reservoir still exceeded 300 NTU after the flood discharge. When the outflow discharge decreased, the critical height of aspiration also decreased, and dissolved pollutants could neither be vented nor precipitated quickly, not allowing their concentration within the reservoir to decrease further. A three-dimensional hydrodynamic model was successfully used to simulate flood processes and determine an optimal flood discharge plan. We found that the elevations of the outlet and undercurrent layer are essential to determine the efficiency of flood discharge, while appropriate timing and outflow discharge volumes may further enhance the results. Therefore, using a hydrodynamic model to predict the position of an undercurrent layer, and opening spillways near the elevation of the undercurrent layer can improve the efficacy of flood discharge. Our findings provide novel insights that may be used to improve the operation and management of source water reservoirs.

Analisis Debit Banjir Pada Perencanaan Saluran Drainase Daerah Padangsambian Kelod Ruas Jalan Gunung Salak

ABSTRACT: The Padangsambian Kelod area is one of the densely populated areas. This causes changes in the land use function from rice fields to housing, which reduces water infiltration, causing surface runoff. So that the author needs to calculate the flood discharge and drainage planning in the area. The stages in calculating flood discharge to planning drainage channels include looking for stations that affect, namely Ngurah Rai Station, Sanglah Station, Ship Station, conducting existing drainage channels. After that, calculate the total rainfall and maximum rainfall, which means that the data will be used for further calculations such as the consistency test of the Double Mass Analysis method, calculating the regional average rainfall, testing the selection of distribution, calculating rainfall, design the Log Person Type III method, calculating Rain intensity (Talbot, Sherman, Ishiguro), Calculating distribution suitability test (Smirnov Kolmogorov), Calculating flood discharge analysis (Rational) to dimensional calculations. In the analysis of the flood discharge, the flood discharge plan for the 5 year return period is 0.049 (m3/s)> the existing flood discharge is 0.030 (m3/s) so it is necessary to plan drainage channels in the Padangsambian Kelod area.

ANALYSIS AND EVALUATION OF THE DRAINAGE NETWORK SYSTEM IN THE HOUSING AREA OF VILA RIZKI ILHAMI 2 SAWANGAN, DEPOK-WEST JAVA

<p>The impact that occurs from the rampant development of residential areas will certainly make the volume of surface water flow or run off become large. Drainage is a system created to deal with the problem of excess water flow that is above the surface of the earth, some of the things that cause excess water are caused by high water intensity and the long duration of rain. In this study, the problem that occurred was in the drainage network in the residential area of Vila Rizki Ilhami 2 Sawangan, which was a transfer of land functions from infiltration land into a residential area. Evaluation that must be done is covering hydrological analysis and hydraulics analysis to get the amount of flood discharge plan that will be used to analyze the capacity of the planned channel so that no flooding occurs at the location of the settlement area when the settlement is built, recommendations for drainage system design and determine the size of the river dimension / size / times that should be made when accommodating water discharge during maximum rain so that the flood control system can be well integrated. With 3 methods of calculating rainfall, the method of calculation is selected using the gumbel method which is SNI (Indonesian National Standard) with a return period of 2 years, 5 years and 10 years. From the evaluation obtained is to add height height or free board to accommodate flood discharge plan.</p>

Hydraulic analysis of Semarang River in supporting the drainage channel as water tourism

The Semarang River is a flushing channel located in the Semarang River Drainage Sub-System and has the potential to be used as a water tourism area with the concept of Historical River Front City Walk. The planned water tourism area is in the form of procuring boats in the Kota Lama area, which is a historic area in the city of Semarang. This analysis aims to hydrology and hydraulics model of the Semarang River using SWMM 5.1. The method is carried out by observing the existing conditions of the study area, determination of flood discharge plans, and hydraulic analysis. The analysis starts from the Simongan Weir Bridge upstream of the Semarang River to the Berok 2 Bridge, which is located in the Kota Lama area. The results showed the intensity of rainfall designed 25 years is 155.7 mm/hour with the capacity of the Semarang River in existing and planning conditions can still accommodate the flood discharge plan, and a weir with a height of 1 m is needed to maintain the water level in boundary condition so that boat tours can operate optimally.

ANALISIS KAPASITAS SALURAN DRAINASE JALAN MAYJEN HARUN SOHAR KOTA PAGAR ALAM

Drainage is a very important infrastructure for an area. Increasing population causes changes in land use resulting in reduced land infiltration and increased runoff. As happened in the drainage channel of Jalan Mayjen Harun Sohar in the rainy season. Drainage often overflowed and flooded people's homes. The purpose of this study is to analyze the capacity of drainage channels on Jalan Mayjen Harun Sohar Kota Pagar Alam. Calculation of Rainfall Intensity using the Mononobe equation. calculation of flood discharge plan based on the Rational method. Distribution of rainfall that is suitable in this study area is to use the gumbell method after being tested with the distribution match using the Chi-squared and Smirnov-Kolmogrov method with a planned rainfall Tr50 = 175.72 mm / hour, so the amount of existing Q = 3,563 m3 / sec and the magnitude of the planned flood discharge Q50 = 2,261 m3 / sec. It was concluded that the capacity of the drainage channel on Jalan Mayje Harun Sohar street was still able to accommodate the planned flood discharge but to avoid detention a dredging of 0.50 m was carried out

Handling of Krueng Jantho Riverbed Degradation with Groundsill Planning

Krueng Jantho river has an important role in the utilization of water resources, watershed conservation, and control of water damage. Dredging of river material has resulted in damage to the ecological factors of the Krueng Jantho river, specifically the degradation of the riverbed which can trigger the collapse of river banks and bridge pillars. The location under review is located in Alue Gintung Village, Seulimuem District, Aceh Besar Regency. Data and maps collected are watershed maps, river discharge data from the Krueng Aceh water level measurement post (AWLR), and topographical and river cross-section data. The method of calculating the generation of discharge data is used the Markov Chain method, the analysis of flood discharge plans using the Pearson Log type III distribution method, and the groundsill building planning for river bottom management and security. The groundsill building for the 25 yearly discharge is planned to be 80.00 m wide, groundsill 1,00 m high and 4.00 m thick groundsill lighthouse.

Studi Ketercukupan Kapasitas Saluran Jalan Pada Jalan Dengan Kelandaian Cukup Tinggi (Studi Kasus Jalan Kawah Ijen, Bondowoso)

Stagnant water in the highway area is the cause of disruption of the smooth flow of vehicle traffic. Even the overflowing of air from the road creates a large flood supply in the road area. The problem of flooding in the Ijen Bondowoso crater road area was also triggered by the inability of the channel that functions to fill the flood water discharge that occurs in this road area. From this problem, it is necessary to study regarding the adequacy of the capacity of the road channel on roads with a fairly high slope such as what happened in the area of Ijen Crater road, Bondowoso From the results of this study it can be seen that the average daily rainfall is the result of 100,461 mm and the relative average rainfall intensity of each channel for the 10 year return period is 63,301 mm / hour. The flood discharge plan is calculated from 2 to 100 years. In this drainage design analysis, the design flood discharge is calculated for only 10 years, and a planned flood discharge is obtained of 0.423 m3 / second. The channel required to fill the flood discharge is a rectangular channel with the size B = H = 0.6 m. It is recommended to always carry out a comprehensive study with regard to changes in the road body of the road along with the increase in existing traffic. As well as the infrastructure of the existing channel and feeding the community around the road, it will be clean and not littering, especially in the road channel

Analysis of Intensity, Duration, Frequency for Groundsill Planning in the Lower Bengawan Solo River Basin

Hydrological analysis is the most important thing in the planning of a water building, including rain. Rainfall characteristics include the intensity of rain (I), length of time of rain (t), depth of rain (d) and Frequency (f). Rainfall intensity can be used to calculate the flood discharge plan using the Rational method. In this study daily rainfall is calculated by analyzing the frequency that starts by determining the average maximum rainfall, then calculating the statistical parameters whose function is to choose the appropriate distribution. So that an appropriate distribution is obtained, namely the Pearson Type III log distribution. From the results of this distribution can calculate the rainfall plan with various times, namely 2,5,10,25 and 50 years. Then the rainfall intensity is calculated using the Mononobe method. The final result of this research is the Intensity Duration Frequency curve. (IDF).

Evaluation of Dimensions and Drainage Performance Office in the Aceh Tamiang Area Kuala Simpang

The Aceh Tamiang office area is one of the office areas in Kuala Simpang which consists of various offices in the Aceh Tamiang area. The purpose of this research is to identify the drainage condition of the existing primary drainage channel which accommodates runoff discharge, the shape and direction of the flow in the inundation channel in the Aceh Tamiang Kuala Simpang office area, which is expected to help solve the problem of flooding in the 832 m3 / second. And for the channel capacity in this primary drainage drainage of 0.829 m3 / sec, the value is smaller than the planned flood discharge (Qr). Rainfall intensity (I) of 126,432 mm / hour. The plan flood discharge (Qr) for a 5-year return period yields 2,551 m3 / second and the value for channel discharge capacity (Qs) is obtained from the calculation of 2,216 m3 / second. This value is smaller than the value of the planned flood discharge.area. From the results of research conducted by the Aceh Tamiang Kuala Simpang office area is a location with a fairly high degree of rainfall, with a rainfall intensity (I) of 126,432 mm / hour and a flood discharge plan for a 5-year return period obtained a result of 0.

SIDOARJO MUD DRAINAGE SYSTEM

Sidoarjo or Lusi mud has an area of ​​640 ha and an average embankment height of 10 meters and submerges three sub-districts, namely Porong District, Jabon District and Tanggulangin District. In 2018, the Sidoarjo mud embankment has decreased or subsided by up to 8.5 meters at several points, which was caused by the condition of the embankment which was almost full and caused the soil condition of the embankment to become unstable. For this problem, it is necessary to build a drainage channel at the edge of the embankment to overcome the overflow of the embankment and flow it to the Porong river which is on the south side of the Sidoarjo mud embankment. From the calculation of the planned rain discharge, it is found that R2 = 72.95 mm after the planned rainfall is obtained, then the next is to look for the flood discharge plan which then plans the dimensions of the channel on the west and east sides of the embankment after obtaining the dimensions of the channel, then the next is planning the resistance pond and draining it to the porong river. with Siphon Network Pipe