scholarly journals Dependable Flow and Flood Control Performance of Logung Dam, Central Java Province, Indonesia

2017 ◽  
Vol 3 (2) ◽  
pp. 343 ◽  
Author(s):  
Faza Ramadhani
Keyword(s):  
Cross Sections ◽  
Water Availability ◽  
Water Demand ◽  
Flood Control ◽  
Flow Characteristics ◽  
Low Flow ◽  
Control Performance ◽  
Central Java ◽  
Irrigation Water Demand ◽  
Reservoir Routing

The change of land use in Mt. Muria area Central Java has been resulting in the significant sheet erosion of upstream watershed around Mt. Muria, followed by considerably high sedimentation on rivers downstream that lead to the reduction of cross sections of the rivers including Logung River. Such situation has been contributing the condition that downstream of Logung River is very potential to experience over flow and inundation to its surrounding area. An idea of constructing the Logung Dam was introduced in 1986 that aimed at reducing the aforementioned inundation. Besides, the development of Logung Dam was also aimed at fulfilling both irrigation and non-irrigation water demand. This paper presents the results of the analysis of the water availability and flood control performance of the Logung Dam. The dependable flow was analyzed by applying the National Rural Electric Cooperative Association (NRECA) method in order to determine the low flow characteristics, whereas the identification of the high flow characteristics was carried out by using the Synthetic Unit Hydrograph (SUH) methods, i.e., the GAMA I and Nakayasu modeling approach. At a certain reservoir characteristic and a defined geometry of spillway, several reservoir routing simulations were carried out on both dependable flows and high flows. Results of the reservoir routing showed the promising water availability of the Logung Dam to fulfill water demand for both irrigation and non-irrigation, whereas the reservoir routing could reduce the probable maximum flood from QPMF from 1,031 m3/s to approximately 950 m3/s or damping efficiency at 7.86%. Further analysis suggests necessary operation and maintenance of Logung Dam to sustain its function and to mitigate possible problems related to reservoir sedimentation.

scholarly journals Quasi-online flood forecasting downstream of dams based on rainfall thresholds

2013 ◽  
Vol 45 (4-5) ◽  
pp. 519-528 ◽  
Author(s):  
Bahram Saghafian ◽  
Saeed Golian ◽  
Hossein Khodadadi
Keyword(s):  
Cross Sections ◽  
Flood Control ◽  
Flood Forecasting ◽  
Rainfall Threshold ◽  
Risk Tolerance ◽  
Initial Water ◽  
Reservoir Routing ◽  
Prone Area ◽  
Southwestern Iran ◽  
Water Elevation

Dams are built to supply water to users and often to protect people and properties against floods in downstream areas. Efficiency of dams for flood control is improved substantially if a flood forecasting system is implemented. Rainfall threshold (RT) depths correspond to the occurrence of critical discharge at given cross-sections for given rainfall durations and initial soil moisture conditions of the upstream watershed. Here, we present an RT-based approach for offline flood forecasting downstream of dams. The proposed methodology incorporates rainfall-runoff and reservoir routing models while the spatial distribution of rainfall is probabilistically modeled based on a Monte Carlo approach. The RT curves are derived as a function of initial water elevation in the reservoir. The algorithm is implemented for a flood-prone area downstream of a dam in southwestern Iran. The results showed a clear rise in the RT values compared to the no-dam case, which is mainly due to the reservoir routing effect. The rate of rise in the RT values decreased with higher initial water elevation in the reservoir. The proposed method also provides the operator with the flexibility of adopting one of the various RT curves subject to different probabilities based on risk tolerance.

scholarly journals A critical review of the Ganges Water Sharing arrangement

Water Policy ◽  
2019 ◽  
Vol 21 (2) ◽  
pp. 259-276
Author(s):  
Kazi Saidur Rahman ◽  
Zahidul Islam ◽  
Umme Kulsum Navera ◽  
Fulco Ludwig
Keyword(s):  
Water Availability ◽  
Water Demand ◽  
Regional Cooperation ◽  
High Water ◽  
Low Flow ◽  
Critical Periods ◽  
Water Sharing ◽  
Water Abstraction ◽  
The Ganges ◽  
The Impact

Abstract The 1996 Ganges Water Sharing Treaty was an important breakthrough in solving disputes over sharing Ganges water between India and Bangladesh. This study evaluates cooperation reflected in the Treaty by performing a quantitative analysis on available water sharing data. The study recognized that inaccurate projection of future flow and the obligation of allocating guaranteed 991 m3/s flows perpetuate the ongoing water sharing conflicts. The provision of guaranteed minimal flow alternately to India and Bangladesh during critical periods leads to frequent occurrences of low-flow events. Results indicated that the Treaty underestimated the impact of climate variability and possibly increasing upstream water abstraction. Statistical analysis of the post-Treaty data (1997–2016) also indicated that 65% of the time Bangladesh did not receive its guaranteed share during critical dry periods with high water demand. It is advised to project the reliable water availability using a combination of modelling and improved observation of river flows. In addition, the condition of minimum guaranteed share should be removed to reduce the frequency of low-flow events in future. Although our analyses show a number of weaknesses, the Treaty could still enhance the future regional cooperation if some adjustments are made to the current terms and conditions.

scholarly journals Water Balance Supporting the Irrigation Water Demand in Java Island, Indonesia

2021 ◽  
Vol 53 (1) ◽  
Author(s):  
Yudha Mediawan ◽  
Lily Montarcih ◽  
Widandi Soetopoi ◽  
Tri Budi Prayogo
Keyword(s):  
Water Balance ◽  
Water Availability ◽  
Irrigation Water ◽  
Water Demand ◽  
Rice Fields ◽  
Water Shortages ◽  
Hydrological Simulation ◽  
Irrigation Water Demand ◽  
Excess Water ◽  
Catchment Areas

Java is the most populous island with the largest percentage of rice fields in Indonesia. However, rice fields in Java Island often experience water shortages, so an analysis of the potential water availability for irrigation in Java is required. This research aims to analyze water's potential to meet irrigation water needs in each catchment area in Java. In this research, the potential for irrigation water in Java is calculated based on the balance of water balance between water availability and DMI and Irrigation water needs. This research is divided into two parts: (1) analysis of water availability using the WFLOW hydrological simulation; and (2) water demand analysis based on population statistical data. Based on this research, it can be concluded that the water balance between water resources and irrigation water needs in Java is still in the surplus category, even though there are deficits in several catchment areas (WS): in the Kepulauan Seribu, Wiso Gelis, and Welang Rejoso WS. WS with the most water availability is generally located in wide (WS) areas, while several WS with abundant water needs is generally located in WS with the densest population. According to The Central Bureau of Statistics (BPS), the agricultural area in Java has decreased by an average of 20 thousand hectares per year, so that the demand for irrigation water on the island of Java will also decrease. Consequently, the excess water potential in Java Island needs to be allocated to meet the needs of DMI, which are increasing every year. In addition, the results also show that the development of irrigation areas in the future should be focused on large (WS) areas that have the potential for significant amounts of irrigation water. 

scholarly journals Modelling the effects of land-use and land-cover change on water availability in the Jordan River region

2009 ◽  
Vol 21 ◽  
pp. 73-80 ◽  
Author(s):  
L. Menzel ◽  
J. Koch ◽  
J. Onigkeit ◽  
R. Schaldach
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Land Cover Change ◽  
Water Availability ◽  
Irrigation Water ◽  
Water Demand ◽  
Jordan River ◽  
Irrigation Water Demand ◽  
River Region ◽  
The Future

Abstract. Within the GLOWA Jordan River project, a first-time overview of the current and possible future land and water conditions of a major part of the Eastern Mediterranean region (ca. 100 000 km2) is given. First, we applied the hydrological model TRAIN to simulate current water availability (runoff and groundwater recharge) and irrigation water demand on a 1 km×1 km spatial resolution. The results demonstrate the scarcity of water resources in the study region, with extremely low values of water availability in the semi-arid and arid parts. Then, a set of four divergent scenarios on the future of water has been developed using a stakeholder driven approach. Relevant drivers for land-use/land-cover change were fed into the LandSHIFT.R model to produce land-use and land-cover maps for the different scenarios. These maps were used as input to TRAIN in order to generate scenarios of water availability and irrigation water demand for the region. For this study, two intermediate scenarios were selected, with projected developments ranging between optimistic and pessimistic futures (with regard to social and economic conditions in the region). Given that climate conditions remain unchanged, the simulations show both increases and decreases in water availability, depending on the future pattern of natural and agricultural vegetation and the related dominance of hydrological processes.

scholarly journals Analisa Kebutuhan Air Irigasi Untuk Tanaman Padi Dan Palawija Pada Daerah Irigasi Rawa (DIR) Danda Besar Kabupaten Barito Kuala

2020 ◽  
Vol 8 (2) ◽  
pp. 79-87
Author(s):  
Fitriansyah Fitriansyah ◽  
Elva Shanty Widuri ◽  
Eriza Islakul Ulmi
Keyword(s):  
Water Availability ◽  
Irrigation Water ◽  
Water Demand ◽  
Irrigation System ◽  
Close System ◽  
Equitable Distribution ◽  
Irrigation Network ◽  
Irrigation Area ◽  
Irrigation Water Demand ◽  
Planting Season

In the management of a good irrigation system will increase the production of irrigation areas because in the Operation of an Irrigation Network should always pay attention to the Availability of Water and Water Needs and how to divide the existing water regularly and evenly so that all plants grow well. To supply water to the paddy fields and will be divided to each plot through the floodgates with an open-close system with equitable distribution so that the Water Availability and Water Needs are still metatalltimes. The research location of the Danda Besar Swamp Irrigation Area (DIR) is located in Rantau Badauh District, Barito Kuala Regency. From the results of the analysis of water availability, the minimum water requirement is 37,760 lt/sec/ha in January 1 during the rice planting season. Maximum irrigation water demand is 711,558 lt/sec/ha in April 1, which is when preparing land for palawija (maize)

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