Occurrence of toxic cyanobacteria and microcystin toxin in domestic water storage reservoirs, Egypt

2016 ◽  
Vol 65 (5) ◽  
pp. 431-440 ◽  
Author(s):  
Zakaria A. Mohamed ◽  
Mohamed Ali Deyab ◽  
Mohamed I. Abou-Dobara ◽  
Wesam M. El-Raghi
Keyword(s):  
Water Storage ◽  
Domestic Water ◽  
Toxic Cyanobacteria ◽  
Storage Reservoirs

scholarly journals Water storage reservoirs and their role in the development, utilization and protection of catchment

Spatium ◽  
2011 ◽  
pp. 9-15
Author(s):  
Branislav Djordjevic ◽  
Tina Dasic
Keyword(s):  
Water Management ◽  
Sustainable Development ◽  
Development Strategy ◽  
Water Storage ◽  
The Sustainable Development ◽  
Storage Reservoirs ◽  
Development Plans ◽  
The Creation ◽  
Negative Impacts ◽  
Hydrological Regimes

Reasons why water storage reservoirs are necessary in accordance with the sustainable development strategy are described in the paper. The main positive and negative impacts of reservoirs on the environment are analyzed. The most important are: the improvement of hydrological regimes (decreasing maximal and increasing minimal flows), the creation of optimal water management, utilization and protection of water, and the creation of better conditions for river and coastal ecosystems. Negative impacts and measures for its mitigation or elimination are also analyzed. The conclusion is that water storage reservoirs can be harmoniously incorporated into the environment. Serbia has a limited number of locations suitable for the construction of reservoirs, therefore it is necessary to retain these areas for storage in regional development plans and other legal acts.

Design recommendations for reinforced concrete cylindrical storage structures for aqueous materials

1987 ◽  
Vol 14 (4) ◽  
pp. 542-549
Author(s):  
J. C. Jofriet ◽  
R. Green ◽  
T. I. Campbell
Keyword(s):  
Reinforced Concrete ◽  
Tensile Stress ◽  
Limit State ◽  
Water Storage ◽  
Lateral Wall ◽  
Temperature Gradients ◽  
Design Criteria ◽  
Storage Reservoirs ◽  
Storage Structures ◽  
State Criterion

The design of cylindrical non-prestressed concrete storage structures in Ontario does not appear governed by any standard or building code. Many aboveground water storage reservoirs in Ontario have deteriorated badly in a relatively short period of use. Many farm silos suffer from problems similar to those of the water storage reservoirs. This paper is concerned with the selection of the wall thickness and the hoop reinforcement for cylindrical storage tanks and silos for liquids or wet materials where tensile cracking of the concrete is to be limited.Three design criteria are presented. The first limits the circumferential tensile stress in the concrete from lateral wall pressure, shrinkage, and temperature gradients in the wall. The second is concerned with the tension in the hoop reinforcement and guards against collapse. The third limits the crack widths of the cracked concrete section. The most important design loads are discussed. Maximum values for hoop tension are provided for liquid pressures. A design temperature gradient of 15 °C is recommended for design in southern Ontario. As well, appropriate values of shrinkage tensile stress are suggested. The collapse limit state criterion must be evaluated for the hoop steel stresses due to the lateral wall loads. The limit state criterion related to the hoop tensile stress in the concrete must be investigated for all possible load combinations of lateral wall load, shrinkage, and temperature gradients. Reasonable load combination factors have been recommended. Recommendations on the tensile strength of concrete and on appropriate strength factors have been made. Key words: cylindrical tank, design criteria, hoop stresses, reinforced concrete, silo, standpipe, storage of liquids, storage of saturated bulk materials.

scholarly journals A critical review of the effect of water storage reservoirs on organic matter decomposition in rivers

2017 ◽  
Vol 25 (2) ◽  
pp. 193-198 ◽  
Author(s):  
John Gichimu Mbaka ◽  
Mercy Wanjiru Mwaniki
Keyword(s):  
Organic Matter ◽  
Litter Decomposition ◽  
Water Storage ◽  
Organic Matter Decomposition ◽  
Effect Of Water ◽  
Storage Reservoirs ◽  
Different Types ◽  
Negative Effect ◽  
Tree Leaf ◽  
Habitat Variables

Organic matter decomposition is vital in sustaining river food webs. However, little is known about the effect of water storage reservoirs on organic matter decomposition in rivers. In this paper, we reviewed and analyzed 37 studies that investigated the effect of man-made reservoirs on organic matter decomposition in rivers. Most studies focused on decomposition of tree leaf litter (54.1%) and macrophytes litter (43.2%), while fewer studies evaluated decomposition of wood (2.7%). Based on qualitative analysis, the effect of small weirs on organic matter decomposition is local and the effect on most habitat variables is minimal. Mean effect sizes (Hedges’ g) for organic matter decomposition were −1.98 for small weirs, −1.31 for small reservoirs, and −0.66 for large reservoirs. This review demonstrates that, in general, reservoirs have a negative effect on litter decomposition. Litter decomposition, an important ecosystem process, is sensitive to impacts of reservoirs in different types of rivers.

scholarly journals MONITORING OF DRINKING WATER RESERVOIRS OF KOPARGAON CITY WITH SPECIAL REFERENCE TO ALGAL FLORA AT YESGAON, DIST. AHMEDHNAGAR MAHARASHTRA (M.S.), INDIA

2020 ◽  
Vol 8 (9) ◽  
pp. 16-21
Author(s):  
R. R. Sanap ◽  
B. P. Shevare ◽  
M. M. Barwant
Keyword(s):  
Drinking Water ◽  
Monsoon Season ◽  
Water Storage ◽  
Summer Season ◽  
Algal Flora ◽  
Storage Tanks ◽  
Algal Population ◽  
Dominant Group ◽  
Storage Reservoirs ◽  
Investigation Period

Algal collection from 5 drinking water storage reservoirs of Kopargaon city was carried out for one year. A total 39 genera and 62 species belonging to four classes were encountered during investigation period. Present studies revealed that, algal population was not found homogenous throughout the year, but it showed seasonal variation. During monsoon the algal population recorded was less, which increases in winter and found more in summer season. Chlorophyceae was found to be the dominant group throughout the investigation period in all storage tanks consisting of large number of genera and species. Many planktonic, some benthic and epiphytic algae were encountered during investigation period at all five water storage reservoirs. The commonly occurred genera were Ankistrodesmus, Closterium, Cosmarium, Spirogyra, Ulothrix from class Chlorophyceae, while from Cyanophyceae, Merismopedia, Microcystis, Oscillatoria, and Lyngbya are dominating forms. Desmids wear found in dominant condition in all storage tanks indicating unpolluted condition of water. Maximum population of Cosmarium was recorded during summer season, while Closterium species were recorded throughout the year. Other genera recorded were Staurastrum, Xanthidium, Euastrum, Micrasterias, Arthrodesmus, Desmidium, etc.  Diatoms were recorded more in number during winter, while Euglenophycean members were sparsely reported only in summer. During present studies tremendous variations in Desmid diversity was noticed during summer and winter as compared to monsoon season.

Cyanobacteria and their toxins in treated-water storage reservoirs in Abha city, Saudi Arabia

Toxicon ◽  
2007 ◽  
Vol 50 (1) ◽  
pp. 75-84 ◽  
Author(s):  
Zakaria A. Mohamed ◽  
Abdulrahman M. Al Shehri
Keyword(s):  
Saudi Arabia ◽  
Water Storage ◽  
Treated Water ◽  
Storage Reservoirs
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