Print ISSN: 1813-0526

Online ISSN: 2220-1270

Main Subjects : Water resources engineering


Slope Stability Study of Al-Qaim Dam that Proposed to be Constructed on Khosar River – Case Study

Farah K. Saeed; Kamel A. Almohseen; Abdulwahab M. Yunis

Al-Rafidain Engineering Journal (AREJ), 2020, Volume 25, Issue 2, Pages 75-83
DOI: 10.33899/rengj.2020.127023.1034

It is extremely significant during the design stage of an earth dam is to analyze the seepage and slope stability. The proposed Al-Qaim dam on  Al Khoser river was used as a case study to apply Geo-Studio 2012 program and its appendices Seep/w and Slope/w. Some minor modifications to the original design suggested by SOGREAH company have been proposed. The Geo-Studio 2012 program was used to analyze three states of Al-Qaim reservoir i.e. (end of construction، steady-state، and rapid drawdown). Seep/w and Slope/w have used to analyze the seepage and the stability of the slopes، the results reveal a good agreement between this analysis and the design company's results. Moreover، the present analysis achieves the requirement of safety with less volume of embankment which reduces the cost of construction substantially.
 

Analysis of Rainfall Data for a Number of Stations in Northern Iraq

Ihsan F. Hasan; Younis N. Saeed

Al-Rafidain Engineering Journal (AREJ), 2020, Volume 25, Issue 2, Pages 105-117
DOI: 10.33899/rengj.2020.127531.1044

This study aimed to analyze the rainfall time series data for 9 stations in the north of Iraq, namely (Sulaymaniyah, Darbandikhan, Dokan, Duhok, Erbil, Kirkuk, Mosul, Sinjar, Tal-Afar) from 1979 until 2014 using the Multiplicative model of time series, this is for the purpose of identifying the reality of the time series variables (general trend, seasonal, periodic, random) which affected by the rains, and the prediction of monthly rainfall data for the  selected stations. The rainfall characteristics of the northern region of Iraq were also studied in terms of daily, monthly and annual distribution of rainfall rates and a relationship between intensity-Duration-Frequency (IDF) at different return periods (2, 5, 10, 15, 25, 50, 100) years has been found to identify the reality of rainstorms and provide solutions  to a number of design problems related to management and treatment of water for Basins in general and ungauged Basins in particular such as surface runoff discharge and erosion control.

Surrogate Worth Trade - Off (SWT) Method and the Decision-Making Process in Water Resources Planning and Management

Mohammed Awni Khattab; Kamel Ali Almohseen

Al-Rafidain Engineering Journal (AREJ), 2020, Volume 25, Issue 2, Pages 118-126
DOI: 10.33899/rengj.2020.127592.1049

Multi-objective decision-making methodologies are one among widely researched areas in recent years. As a result, many technologies have been developed. Among these, is Surrogate Worth Trade - Off (SWT). SWT has emerged in the areas of water resource planning and management, and is one of the multi-objective analysis methods described as an interactive method. This study includes reviewing and applying (SWT) method to optimally operate the Mosul Dam Reservoir. This operation policy sought to achieve two contradictory objectives: diverting water from the reservoir for irrigation purposes and releasing water from it for the purpose of hydropower generation. A comparison was also made of the results that were nominated from the application of this method, namely (allocating million cubic meters/ year for irrigation and generating 1572 GW-hour/year for power generation) with the results of the research [3] which four methods for solutions have been implemented. These are: weights, constraints, goal attainment, and step method. The results reveal that the used methods gave the optimal solution by (allocating 5906 million cubic meters/ year for irrigation and generating 1,600 GW-hour/year for power generation), (6236 ,1555) , (6188 ,1558) and (6121 , 1568) respectively. from the comparison It can be concluded that (SWT)  is an efficient and promising method in identifying an operating policy for a single reservoir system with competing objectives.

Planning and Decision Making Under Uncertainty (Mosul Reservoir Optimal Operating Policy- Case Study)

Mohammed Awni Khattab; Kamel A. Al-Mohseen

Al-Rafidain Engineering Journal (AREJ), 2020, Volume 25, Issue 1, Pages 85-96
DOI: 10.33899/rengj.2020.126885.1032

This study is concerning the planning and decision making process of water resources projects under uncertainty. It includes a mathematical analysis to optimize the operation of the Mosul reservoir sought to achieve two conflicting goals, diverting water from for irrigation and releasing water for hydroelectric generation. Four methods of solutions have been implemented. These are: weights, constraints, goal attainment, and step method. The results reveal that the used methods gave the optimal solution by allocating 5906 million cubic meters/ year for irrigation and 1600 Gw-hour/year for power generation ),(6236, 1555), (6188, 1558),and (6121,1568) under the given inflow conditions . The current study suggested that the average value of these solutions i.e (6113, 1570) can be taken as a compromise solution to the problem. It is believed that this solution has a good chance to be selected by the decision-maker, because it contains the least possible degree of subjectivity.

Testing of the Homogeneity of Precipitation Time Series in Selected Regions of Iraq

Samah Mohammed Qasim; Abdulwahab Mohammad Youns; Omar M. Mahmood-Agha

Al-Rafidain Engineering Journal (AREJ), 2020, Volume 25, Issue 1, Pages 126-137
DOI: 10.33899/rengj.2020.127033.1035

Precipitation data are subject to many tests and assessments before being used for studies in the field of water resources, hydrological processes, and climate change research to ensure their reliability and quality. Homogeneity tests are considered as a useful tool to control the reliability and quality of data. In this study, a homogeneity test was performed for the monthly rainfall data distributed over different regions of Iraq. Homogeneity was examined using four tests: Pettit, SNHT, BRT and VNRT at a confidence level of 5%.The results showed that the time series for the winter months of the Ramadi, Baghdad, Hilla, Khanaqin and Karbala stations were heterogeneous, while the time series of the Al-Nakhaib, Wetba, Baghdad and Tal Afar stations during the spring months were statistically heterogeneous according to the SNHT test. While the Pettitt test showed heterogeneous results for the stations of Nasiriyah, Basra, Khanaqin and Kirkuk for the winter months. Al-Rutba, Khanaqin, Tal Afar,Sinjar,Mosul and Karbala for the spring months. The data for all stations were homogeneous, using the BRT test for the winter and spring months. VNRT test showed the heterogeneity of the data for the Samawah stations for the months of winter, Ramadi, Nakhab, Tal- Afar and Najaf for the months of spring. The current study also showed that the precipitation of all stations are classified as useful, with the exception of the Al-Nukhaib and Najaf stations, which have been classified as doubtful .