The Impact of the Surrounding Land Uses on Water Quality of Some Selected Cascade and Perennial Tanks in Anuradhapura District, Sri Lanka

Abstract

The present study was conducted to evaluate the water quality of the inlet, irrigation outlet, and edges linked to Nuwarawewa reservoir, Mahakanadarawa reservoir, Hurulu wewa reservoir, Sangilikandarawa reservoir, and Nachchaduwa perennial reservoir in Anuradhapura, Sri Lanka. Water samples were taken from a designated position of each inlet, irrigation output, and edges in the second inter-monsoon, northeast monsoon, and first inter-monsoon seasons. Water quality indicators such as pH, electrical conductivity (EC), total dissolved solids (TDS), Na, K, Ca, Mg, Sodium Adsorption Ratio (SAR), NO3- -N, NH4+-N, dissolved reactive phosphorus (DRP), and heavy metals (Cd, As, Pb, and Hg) concentrations were measured in each water sample. Data was analyzed using SPSS statistica software. Considerable temporal fluctuations in water quality indicators were detected in inlets, irrigation outflows, and edges over the research period. The findings revealed that NO3- -N, NH4+-N, and DRP in Sangilikandarawa reservoir during the northeast monsoon were close but not above the FAO (1985) maximum levels guidelines for irrigation water. pH, EC, TDS, and heavy metals (Cd, As, Pb, and Hg) in all the other tanks were within permitted values according to WHO drinking water quality standards and FAO (1985) guidelines for irrigation water. This finding further demonstrated that the consequences of surrounding land use on water pollution in inlet water canals linked to Sangilikandarawa and Nuwarawewa are greater. It could be concluded that a pollution management plan needs to be implemented in order to stop further pollution.

Livelihood status of the fishing community of Mahakanadarawa reservoir in Anuradhapura, Sri Lanka

“…Despite the acquired knowledge regarding the dimensions and growth stages of Oreochromis niloticus, a multitude of factors intrinsic to the ecology of Mahakanadarawa freshwater dynamism remains to be investigated. Further research orientations might duly consider the contributions of such growth patterns to population and yield modulations across the seasonal and annual spectrums, as well as their interaction with environmental and anthropogenic variables, such as the influence of surrounding land uses on water quality, which inextricably affect the vitality and viability of fisheries subsystems (Herath et al 2022).…”

Electrochemical sensing of Hg(ii) in chicken liver and snail shell extract samples using novel modified SDA/MWCNT electrodes

“…[1][2][3] The toxic heavy metals mercury (Hg(II)) and cadmium (Cd(II)) in their +2 oxidation state can seriously harm the human central nervous system (CNS), skin, muscle tissue (Hg(II)), bones, blood plasma, cardiovascular system (Cd(II)), renal system, and gastrointestinal tract. [4][5][6] According to the United States (US) Agency for Toxic Substances and Disease Registry (ATSDR). 7 For instance, mercury has widespread industrial applications like lamps, batteries, thermometers, and electrolytic manufacture in chlorine and sodium hydroxide.…”