Physico-Chemical Features of the Kpassa Reservoir, Northern Benin, with Emphasis on Its Trophic State: A Preliminary Study

Boukari, Ousmane Touré; Mama, Daouda; Abou, Youssouf; Bawa, Moctar Limam

doi:10.4236/jep.2016.713161

Cited by 2 publications

(2 citation statements)

References 19 publications

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“…is is contrary to many other countries where water quality monitoring programs of reservoirs and lakes are common [2,3,5,8,[44][45][46][47][48]. Padaviya Reservoir (8°49′30.6″ N 80°46′2.05″ E, 75 m above sea level) is a shallow man-made irrigation reservoir situated at the District of Anuradhapura, Sri Lanka's North Central Province (Figure 1).…”

Section: Introductionmentioning

confidence: 94%

Seasonal and Spatial Variation of Dissolved Oxygen and Nutrients in Padaviya Reservoir, Sri Lanka

Siriwardana

Cooray

Liyanage

et al. 2019

Journal of Chemistry

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Lakes, reservoirs, rivers, and aquifers are important freshwater sources for basic human needs such as drinking, sanitation, and agriculture. e anthropogenic influences on the natural environment, especially on freshwater resources, have increased dramatically during the last few decades. Eutrophication and pollution are major threats to many of these water bodies. ere are thousands of man-made reservoirs, which are centuries old in Sri Lanka, and only a handful of them have been extensively studied and monitored. is study investigates the spatial and seasonal variations of water quality in Padaviya Reservoir by studying the vertical distribution of physical parameters and inorganic nitrogen species: ammonia, nitrite and nitrate, reactive phosphate, and dissolved oxygen. Padaviya Reservoir, which is an ancient man-made irrigation reservoir, has never been studied in detail to assess its water quality. Sharp chemical gradients for ammonia, nitrite, nitrate, reactive phosphate, and dissolved oxygen were observed between surface and bottom waters of the reservoir, suggesting that it does not overturn completely. e temperature difference is between the surface and bottom waters of about 2°C, which is not large enough to cause thermal stratification. e most probable reason for the stratification is extensive photosynthesis at surface waters with subsequent decomposition of the organic material at the bottom.

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Section: Introductionmentioning

confidence: 94%

Seasonal and Spatial Variation of Dissolved Oxygen and Nutrients in Padaviya Reservoir, Sri Lanka

Siriwardana

Cooray

Liyanage

et al. 2019

Journal of Chemistry

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“…Same work was made by [12]. [13] provided recent data on the physicochemical characteristics of the reservoir including its trophic state and N:P ratio. The present study aimed at carrying out similar work over the period going from august 2014 to may 2016.…”

Section: Introductionmentioning

confidence: 98%

Water Quality Monitoring in Kpassa Reservoir (Northen Benin): Physico-Chemical Parameters, Trophic State and N: P Ratio

Boukari¹,

Bawa²,

Mama³

et al. 2018

WROS

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The study was carried out to assess the physico-chemical parameters, the trophic state and the N:P ratio of the Kpassa reservoir. The reservoir was studied at six sampling sites over the period going from August 2014 to May 2016. Water transparency was determined in situ with the secchi disk SDMO QUINIOU model F043SE. Chlorophyll a, NO 3-, NO 2-, NH 4 + , PO 4 3and total phosphorus were analyzed using the standard methods. Measures were made with the HACH DR2800 spectrophotometer. The trophic state was assessed using the Carlson's trophic state index (TSI). The N:P ratio was evaluated using NO 3-, NO 2-, NH 4 + and PO 4 3concentrations. The physico-chemical parameters investigated were: transparency (0.25-1.92m), chlorophyll a (8.2-233.46µg/L), nitrate (undetected-4.73mg/L), nitrite (undetected-0.23mg/L), ammonia (undetected-0.21mg/L), orthophosphate (0.03-1.04mg/L) and total phosphorus (0.1-3.2mg/L). The trophic state index (TSI) values oscillate between 38 and 59. The majority of the values are characteristic of mesotrophic conditions. Kpassa reservoir is eutrophic only in August 2014 at the whole studied stations. N:P ratio values vary between 0.22 and 60.46 showing that eutrophication in Kpassa reservoir is limited by phosphorus and nitrogen. Some physico-chemical parameters values are upper than the WHO and Ifremer safe limit making the reservoir water unfit for human consumption at the concerned sites and during the concerned period. It is recommended that the national company of Benin water (SONEB) sensitize the population on the rational use of the fertilizers and the adoption of water control technics in the farm. Washing and crockery activities should be also forbidden along the reservoir river. The trophic state of the reservoir seems improved compared to previous studies results. According to the N: P ratio values, measurements to be implemented for eutrophication management in Kpassa reservoir should emphasize on the control of the flow of nitrogen and phosphorus compounds.

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Physico-Chemical Features of the Kpassa Reservoir, Northern Benin, with Emphasis on Its Trophic State: A Preliminary Study

Cited by 2 publications

References 19 publications

Seasonal and Spatial Variation of Dissolved Oxygen and Nutrients in Padaviya Reservoir, Sri Lanka

Seasonal and Spatial Variation of Dissolved Oxygen and Nutrients in Padaviya Reservoir, Sri Lanka

Water Quality Monitoring in Kpassa Reservoir (Northen Benin): Physico-Chemical Parameters, Trophic State and N: P Ratio

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