Nile Water Science & Engineering Journal

VOLUMES

Volume: Volume 6, 2013

Issue: Issue 1 , 2013, July

Status of Small-Scale Irrigation Projects in Amhara Region, Ethiopia

On Wednesday, 1st of May, 2013. 11:16:44 AM
By Bitew Genet Tassew

Topic: Hydraulic Structures
Paper |

Downloaded: 6

Abstract

The Amhara Region debate on irrigation was concentrated on expansion of hectares under irrigation, whilst skirting around the socio-economic effects read more

Integration of GIS and Geoelectric Surveying for the Assessment of Groundwater Pollution, A Case Study of Part of Ikeja, Lagos State, West Africa, Nigeria.

On Wednesday, 1st of May, 2013. 11:16:44 AM
By

Topic: GIS and Remote Sensing applications in river engineering
Paper |

Downloaded: 4

Abstract

An integrated approach using GIS and geoelectric surveying has been adopted for the assessment of groundwater pollution in part of Ikeja Local Govern read more

Investigating the Efficiency of the Water Circulation System to Assess Water Quality inside Artificial Lagoons "Case Study Hacienda Bay"

On Wednesday, 1st of May, 2013. 11:16:44 AM
By mohamed bahgat

Topic: Enviromental aspects of river engineering
Paper |

Reads: 65 |

Abstract

This research is aimed to study the effect of the retention time and its impact on the water quality inside an artificial lagoon through checking the read more

Climate Change Impact Assessment on Water Resources of Gumara Watershed, Upper Blue Nile River Basin

On Wednesday, 1st of May, 2013. 11:16:44 AM
By Hanibal Lemma

Topic: River morphology
Paper |

Downloaded: 7

Abstract

Recently, there is growing scientific evidence that the global climate has changed, is changing and will continue to change. Climate change is also e read more

Introducing and Implementing an EMS in Khartoum State Water Corporation

On Wednesday, 1st of May, 2013. 11:16:44 AM
By Haga Mohamed

Topic: Enviromental aspects of river engineering
Paper |

Abstract

Water-related diseases have been reported in many areas in Khartoum state in Sudan, others complain from the water turbidity while others complain th read more

Physical Model Investigation of Pump Station Basins

On Wednesday, 1st of May, 2013. 11:16:44 AM
By SAMIR IBRAHIM

Topic: River morphology
Paper |

Downloaded: 2

Abstract

Experimental tests were carried out to improve the flow patterns and vortices formation in a pump station basin. An undistorted physical model, of sc read more

Evaluation of Methods for Design Discharge Estimation in Ungauged Catchments, A case of Tigithe River catchment in Mara River Basin

On Wednesday, 1st of May, 2013. 11:16:44 AM
By Joel Nobert

Topic: Other
Paper |

Downloaded: 4

Abstract

Realistic design flood estimation, where the magnitude of a flood is associated with a level of risk (e.g. return period), is necessary in the planni read more

Realistic design flood estimation, where the magnitude of a flood is associated with a level of risk (e.g. return period), is necessary in the planning, design and operation of hydraulic structures (e.g. bridges, culverts, dam spillways, drainage canals etc) for the preservation of human life and property. Standard technique for design flood estimation generally includes statistical analyses of observed peak discharges. However, observed streamflow data are often not available at the site of interest for most of the catchments in developing countries and rainfall event-based methods have to be used. In this study, event based rainfall-runoff modelling technique was used to estimate design discharge for six sites in Tigithe River in Mara River basin. Three models were used namely, TRRL East Africa Model, Soil Conservation Service (SCS) unit hydrograph and Snyder unit hydrograph rainfall runoff model. The TRRL East African Model was developed by the UK Transport and Road Research Laboratory on the basis of rainfall-runoff studies for a range of selected East African catchments and applied to catchments up to 200km2. Catchment characteristics such as catchment area, length of the longest course, catchment slope and slope of the longest water course required by the models were derived from Digital Elevation Model (DEM) with 30-m resolution. Measured discharge values at a number of sites along Tigithe River were obtained from published reports provided. Also rainfall data from Tarime, Nyabirama and Gokona were obtained from the Tanzania Meteorological Agency (TMA). The data of interest to the study were the Annual Maximum Daily rainfall required to estimate peak flows at the drainage sites. The results from the frequency analysis of 24-hr Annual Maximum Rainfall values for the three stations provided the input values to the models For all the drainages sites analyzed at different return periods, Snyder method had good agreement with TRRL East Africa Model developed for the East African catchments as compared to SCS method which was under-estimating the peak discharge for all the return periods. less

Comparing different methods of bed shear stress estimates in complex flow fields; the case of Megech River, Ethiopia

On Wednesday, 1st of May, 2013. 11:16:44 AM
By Michael Mehari Moges

Topic: River morphology
Paper |

Downloaded: 1

Abstract

Bed shear stress is a fundamental variable in river studies to link flow conditions to sediment transport. It is, however, difficult to estimate this read more

Dry Season Water Requirements in the Blue Nile basin (Sudan) after Roseires Dam Heightening

On Wednesday, 1st of May, 2013. 11:16:44 AM
By Amira A. A. Mekawi

Topic: Hydraulic Structures
Paper |

Downloaded: 4

Abstract

The flow pattern of the Blue Nile is characterized by its marked seasonality as it builds up from a minimum in March to a maximum in late August or e read more

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