Water quality, selected chemical characteristics, and toxicity of base flow and urban stormwater in the Pearson Creek and Wilsons Creek Basins, Greene County, Missouri, August 1999 to August 2000

During dry periods, the flow of medium and small streams is significantly reduced and equal to groundwater flow. Since the base flows provide information about aquifer characteristics and retention characteristics of a basin, the possibilities of analysis and simulation of base flows gain importance under the conditions of intensive water use and the increasing demand for adequate water quality protection. In this paper, a model was established and used for the description of the principles governing the changes of base runoff on the basis of a streamflow hydrograph registered at the outlet of the basin on the example of the Kolubara basin up to the ?Valjevo? profile. Since the amount of base runoff from a basin cannot be measured, the results of base flows obtained using the local minimum method were adopted as the criterion for the comparison of the modelled values of base runoffs. The created model was applied for making simulations of the base runoff hydrograph during three characteristic years (rainy 1970, average 1985, and dry 1990). Deviations between the base flow values obtained using the established model and by applying the local minimum method are acceptable from the standpoint of general hydrological accuracy.

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Assessment of the Water Quality Characteristics of Kaduna River Receiving Wastewater Discharges

Nigerian Journal of Environmental Sciences and Technology - March 2018 ◽

10.36263/nijest.2019.01.0103 ◽

2019 ◽

Vol 3 (1) ◽

pp. 56-61

Author(s):

H. Garba ◽

C. A. Elanu

Keyword(s):

Water Quality ◽

Dissolved Oxygen ◽

Chemical Oxygen Demand ◽

Biochemical Oxygen Demand ◽

Oxygen Demand ◽

Domestic Wastewater ◽

Quality Characteristics ◽

Chemical Characteristics ◽

Mean Concentration ◽

Concentration Levels

An assessment of the chemical characteristics of industrial and domestic wastewater discharges on seven parameters into Kaduna River on a bimonthly basis was carried out. PH, dissolved oxygen (DO), chloride, nitrite, chemical oxygen demand (COD), biochemical oxygen demand (BOD) and iron were analyzed to determine their concentration levels. From the analysis, the highest mean concentration of the parameters were 8.24 of pH, 7.7 mg/l of DO, 233.4 mg/l of chloride, 55.68 mg/l of COD, 27.95 mg/l of nitrite, 122.22 mg/l of BOD, and 17.05 mg/l of iron. After comparing with prescribed standards, it can be concluded that there is evidence of organic and inorganic accumulation of contaminants into River Kaduna.

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Water Physico-Chemical Characteristics of the Lakes Burera and Ruhondo, Rwanda

Rwanda Journal of Engineering Science Technology and Environment ◽

10.4314/rjeste.v3i2.5 ◽

2020 ◽

Vol 3 (2) ◽

Author(s):

Valens Habimana ◽

Antoine Nsabimana

Keyword(s):

Water Quality ◽

Electrical Conductivity ◽

Water Quality Monitoring ◽

Quality Monitoring ◽

Chemical Characteristics ◽

Class Iii ◽

Populated Area ◽

Physico Chemical ◽

Steep Slopes ◽

Extensive Agriculture

Rwanda possesses multiple lakes, whose properties were rarely described. The present study assessed physico-chemical characteristics of water in Burera and Ruhondo lakes located in highly populated area with steep slopes, which are under extensive agriculture, thus water quality monitoring is important. Both lakes were alkaline with high content of Mg, while Ruhondo had higher electrical conductivity than Burera. Phosphorus and nitrogen exceeded Class III EPA standards indicating that both lakes are at risk of eutrophication. Keywords: water quality, lakes Burera and Ruhondo, Rwanda

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The effect of land use changes to discharge extremities in Cimahi Watershed – Upper Citarum Watershed, West Java

E3S Web of Conferences ◽

10.1051/e3sconf/202014807002 ◽

2020 ◽

Vol 148 ◽

pp. 07002

Author(s):

Siti Ai Nurhayati ◽

Arwin Sabar ◽

Mariana Marselina

Keyword(s):

Water Quality ◽

Land Use ◽

Rock Type ◽

Land Use Changes ◽

Base Flow ◽

Watershed Area ◽

Landuse Change ◽

Hydrological Conditions ◽

The Impact ◽

Land Changes

The development of cities and regencies in the Cimahi watershed area increases the rate of population growth which results in high land requirements in the Cimahi watershed area. Land se change affects the flow of runoff and debit of the Cimahi River. The purpose of this research is to assess the hydrological function area in the Cimahi watershed, the impact of the land use change and to analyze the effect of landuse change in the Cimahi watershed on the extremity of water resources in terms of both quantity and quality. The natural conservation index and the actual conservation index (IKA and IKC) are used as a parameter to indicate the existing hydrological conditions and ideal hydrological conditions for conservation which are calculated based on rainfall, rock type, slope, height and land use. The results of the conservation index showed that there was a decrease in the value of the IKC from 0.637 in 2000 to 0.608 in 2012. The debit extremity could be seen based on the calculations by moving averages on the debit data, and the resulting maximum debit value was greater and the value of the base flow (baseflow) was getting smaller. Land changes in the Cimahi watershed also had an influence on the river water quality.

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