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Estimation of large to rare floods is needed in the design of major water infrastructure such as large bridges, weir s and dam spillways. This paper presents a simple Large Flood Regionalisation Model (LFRM) which is relatively easy to apply in practice. The proposed method assumes that the maximum observed flood data over a large number of sites in a region can be pooled together by accounting for the at-site variations in the mean and coefficient of variation (CV) and inter-station correlation among the flood se...

Bangladesh faces a major challenge in supplying safe potable water to the most of her 160 million people. The drinking water in Ba ngladesh is largely sourced from hand- pump tubewells, which draw drinking water from shallow aquifer, which has been badly polluted with Arsenic in recent years. Although various methods have been proposed to solve this problem, an acceptable and sustainabl e solution is yet to be achieved. As an alternative, rainwater can be harvested and used to secure the safe potable water for Ban...

River bank erosion is a major problem in Ba ngladesh, which is known as the ‘land of rivers’, and suffers from major floods frequently. Due to braided river and alluvial soil type, river bank erosion is quite common in Bangladesh. The country spends millions of dollars every year to control river bank eros ion, which appears to be inadequate. This paper reviews river bank erosion problem in Bangladesh in general and in particular, evaluates the performance of a new technique and identifies avenues for further ...

The Moravica River is one of the most signifi cant right tributaries of the South Morava River. Its total length is 43 km and basin area 640 km 2. The municipal center of Aleksinac with its urban, commercial, industrial and cultural areas is situated close to the Moravica river estuary in to South Morava river. Due to position of the settlement and the natural river channel conditions, significant damages occurred in the past. Flood flows were endangering the inhabited part of Aleksinac, residential and public str...

The modern approach of the water removal works, in sustainable water management conditions, assumes the use of information technology. A series of new methods developed in the frame of computer aided design field have as results the increase of the quality in research and design activitie s by enlarging and studying throughly the scientific investigation. Th e specialized software programs allow to choose and check all the hypothesis assumed, to simulate th e processes and see in a dynamic way the answers to the c...

Ground water, according to higher reliance coefficient and less fluctuations, has been used for many years. Precipitation is a major supplier of underground water resources and aquifers. So any changes in rainfall amount fluctuate underground water table depth. Occurrence of drought is the most important reason for the decrease of water table. To analyze the role of drought on underground water in Shahrekord plain rainfall and water table level were used during 1984-2008 period. The resualts shows a strong correla...

The effect of biodiversity on ecosystem func tion is complex and requires understanding of all interacting systems, such as hydr ology, geology and above ground plant diversity of the study area. In this study hydrogeoch emical modeling using PHREEQC was used to investigate the effect external fact ors (nearby river Saale and an underground channel) on the groundwater chemistry of a large grassland diversity experiment (Jena experiment). Groundwater chemical analys is was performed for river Saale and groundwater ...

There are many problems related to pipe network rehabilitation, the main one being how to provide an increase in the hydraulic capacity of a system. Most of the Slovak irrigation pipe networks are branched, which is case elsewhere. A possible approach to increasing the hydraulic capacity of such system s is to convert them to looped networks (thereby providing alternative pathways) and increase their hydraulic capacity with minimum capital investment. In this work authors deal with application of simulation and op...

Concentration of chlorophyll is a parameter that is considered adequate for assessing the trophic state of lagoon ecosystems . Application of a selected system of bioindicators to provide a good qualitative evaluation of th e trophic state of the lagoons and their dynamics; evaluation of seasonal water quality variability and comparison between lagoons; design of respective measures of reha bilitation, with regards to modification of hydrodynamic conditions of the lagoons throu gh regulation of tide currents. This...

This paperwork makes an assessment of risk failure in defense works against flood located along and perpendicular on rivers , including natural riparian wetlands. Highlighting these areas allow us to ma ke complex studies about the different possibilities of flood mitigation, considering the surfaces and lowering the flood risk. Explanations about the “hazard - risk” scheme are made, with flood analyses in many case studies to propose a computation mode l for risk and management assessment accordingly with the...

Last decade of the 20th century has been identified as the warmest period at the northern hemisphere of the Ea rth during this mille nnium. The result of this fact is the proven melting of glaciers and measurable rising of sea levels. The frequency of meteorological extremes in Europe has doubled compared with data a century ago. Very obvious became rainfalls of intensity greater than 130 l/ m2 and extensive floods. Also the frequency of floods in the Czech Republic (CR) increased significantly in the last years. ...

Natural arjaan complex “Cho igan mineral waters” (then – arjaan Choigan, Choigan springs) – this is unique deposit of de pth (1500 – 2000 m.) carbonic hot and cold waters. There are the data analysis of inve stigations which were carrying out in 1966- 67, 1989-94 and 2010 years in this paper.

The coastal area of the Black Sea of Georgia (Kolkheti Lowland) with its recreational, resort, transport and industrial functions is a very important region in the country. A coastline is formed under the interaction of two environments, the land and the sea with its stability much dependent on the volume and grain size of the coas t-forming material drifted to the coastline by the rivers of the Black Sea basin. 90% of the coastal formations of Georgia belong to an accumulativ e type with their genesis and filled ...

Hydromineral resources of the Republic of Tuva were systematic and comprehensive studied since the end of 80ies of XX-th century. There were carried out hydrochemical, geophysical, microbiological, eco logical, radon- and heliometric investigations practically at all territory of Tuva. Near 100 mineral and fresh arjaans (medicinal water springs), salt and mud lakes were studied on 50-ty various characteristics.