The widespread distribution of river sand-harvesting activities continues to degrade river water quality and the surrounding riverine environments. This study determined practical effects of sand-harvesting on two rivers in Kakamega County Kenya. Water samples were tested for turbidity and total suspended solids (TSS). For riparian soils, nitrogen (N), phosphorus (P), pH, organic carbon (OC), moisture content and textural class were determined on composite samples obtained from the field. Two control sites not affected by sand-harvesting were also used for comparison. Results indicate TSS concentrations increased during the rainy season when sand-harvesting was occurring, with significant differences between the control and sand-harvesting sample groups. Between seasons—dry and wet—in natural circumstances, the riparian soil moisture and phosphorus contents increased significantly. The study shows that river sand-harvesting degrades the aesthetic value of riparian areas, and makes rivers prone to bank erosion, and silt. This increases river water turbidity. The study concludes that sand-harvesting does not directly affect the riparian soil moisture content, total N, P, pH, OC or textural class, but reduces productivity of riparian land and puts the riverine ecosystems at risk.
References
[1]
Schrecker, T., Birn, A.E. and Aguilera, M. (2018) How Extractive Industries Affect Health: Political Economy Underpinnings and Pathways. Health & Place, 52, 135-147. https://doi.org/10.1016/j.healthplace.2018.05.005
[2]
Sreebha, S. and Padmalal, D. (2011) Environmental Impact Assessment of Sand Mining from the Small Catchment Rivers in the Southwestern Coast of India: A Case Study. Environmental Management, 47, 130-140. https://doi.org/10.1007/s00267-010-9571-6
[3]
Hilson, G. (2012) Poverty Traps in Small-Scale Mining Communities: The Case of Sub-Saharan Africa. Canadian Journal of Development Studies/Revue Canadienne D’études Du Développement, 33, 180-197. https://doi.org/10.1080/02255189.2012.687352
[4]
Rentier, E.E. and Cammeraat, L.E. (2022) The Environmental Impacts of River Sand Mining. Science of the Total Environment, 838, Article ID: 155877. https://doi.org/10.1016/j.scitotenv.2022.155877
[5]
Menta, C. (2012) Soil Fauna Diversity-Function, Soil Degradation, Biological Indices, Soil Restoration. In: Akeem, L.G., Ed., Biodiversity Conservation and Utilization in a Diverse World, IntechOpen, London, 59-94. https://doi.org/10.5772/51091
[6]
UNEP (United Nations Environmental Programme) (2014) Sand, Rarer than One Thinks. United Nations Environmental Programme, Global Environmental Alert Service, Nairobi.
[7]
Akanwa, A.O. (2021) River Sand Mining and Its Ecological Footprint at Odor River, Nigeria. In: Banerjee, A., Meena, R.S., Jhariya, M.K. and Yadav, D.K., Eds., Agroecological Footprints Management for Sustainable Food System, Springer, Singapore, 473-514. https://doi.org/10.1007/978-981-15-9496-0_16
[8]
Mwenzwa, E.M. and Misati, J.A. (2014) Kenya’s Social Development Proposals and Challenges: Review of Kenya Vision 2030 First Medium-Term Plan, 2008-2012. http://www.aijcrnet.com/journals/Vol_4_No_1_January_2014/24.pdf
[9]
Barreto, M.L., Schein, P., Hinton, J. and Hruschka, F. (2018) Economic Contributions of Artisanal and Small-Scale Mining in Kenya: Gold and Gemstones. Pact, Westcombe; Alliance for Responsible Mining, Envigado. https://assets.publishing.service.gov.uk/media/5a392bb8e5274a79051c9d7c/Kenya_case_study.pdf
[10]
Igbayiloye, O.B. and Bradlow, D. (2021) An Assessment of the Regulatory Legal and Institutional Framework of the Mining Industry in South Africa and Kenya for Effective Human Rights Protection: Lessons for Other Countries. African Human Rights Law Journal, 21, 363-388. https://doi.org/10.17159/1996-2096/2021/v21n1a16
[11]
NEMA (National Environment Management Authority) (2007) National Sand Harvesting Guidelines, 2007. National Environment Management Authority, Nairobi. https://www.nema.go.ke/images/Docs/Guidelines/NATIONALSANDHARVESTINGGUIDELINES.pdf
[12]
The Government of Kenya (2016) Mining Act. Ministry of Mining and Petroleum. Nairobi. https://portal.miningcadastre.go.ke/Downloads/Mining_Act_2016_Full.pdf
[13]
Kondolf, G.M. (1994) Geomorphic and Environmental Effects of Instream Gravel Mining. Landscape and Urban Planning, 28, 225-243. https://doi.org/10.1016/0169-2046(94)90010-8
[14]
Attiogbe, F. and Nkansah, A. (2017) The Impact of Mining on the Water Resources in Ghana: Newmont Case Study at Birim North District (New Abirem). Energy and Environment Research, 7, 27-36. https://doi.org/10.5539/eer.v7n2p27
[15]
Lekomo, Y.K., Ekengoue, C.M., Douola, A., Lele, R.F., Suh, G.C., Obiri, S. and Dongmo, A.K. (2021) Assessing Impacts of Sand Mining on Water Quality in Toutsang Locality and Design of Waste Water Purification System. Cleaner Engineering and Technology, 2, Article ID: 100045. https://doi.org/10.1016/j.clet.2021.100045
[16]
Nilsson, C. and Svedmark, M. (2002) Basic Principles and Ecological Consequences of Changing Water Regimes: Riparian Plant Communities. Environmental Management, 30, 468-480. https://doi.org/10.1007/s00267-002-2735-2
[17]
Koehnken, L., Rintoul, M.S., Goichot, M., Tickner, D., Loftus, A.C. and Acreman, M.C. (2020) Impacts of Riverine Sand Mining on Freshwater Ecosystems: A Review of the Scientific Evidence and Guidance for Future Research. River Research and Applications, 36, 362-370. https://doi.org/10.1002/rra.3586
[18]
Gitonga, E.K., Agwata, .F. and Gathura, .B. (2017) Factors Affecting Sand Harvesting in Machakos County, Kenya. International Journal of Scientific Research, 6, 277-280. https://www.worldwidejournals.com/international-journal-of-scientific-research-(IJSR)/fileview.php?val=November_2017_1509539249__161.pdf
[19]
CGK (County Government of Kakamega) (2018) The Second County Integrated Development Plan 2018-2022. County Government of Kakamega, Kakamega. https://kakamega.go.ke/download/county-integrated-development-plan-2018-2022/
[20]
Gavriletea, M.D. (2017) Environmental Impacts of Sand Exploitation. Analysis of Sand Market. Sustainability, 9, Article No. 1118. https://doi.org/10.3390/su9071118
[21]
Aliu, I.R., Akoteyon, I.S. and Soladoye, O. (2022) Sustaining Urbanization While Undermining Sustainability: The Socio-Environmental Characterization of Coastal Sand Mining in Lagos Nigeria. GeoJournal. https://doi.org/10.1007/s10708-021-10563-7
[22]
Tsingalia, H.M. (1988) Animals and the Regeneration of a Canopy Tree in an African Tropical Forest Berkely. Ph.D. Dissertation, University of California, Berkeley. https://www.proquest.com/openview/1c7942f9f9d7cf512713f5e978e8ff37/1?pq-origsite=gscholar&cbl=18750&diss=y
[23]
Ongoma, V., Chen, H. and Omony, G.W. (2018) Variability of Extreme Weather Events over the Equatorial East Africa, a Case Study of Rainfall in Kenya and Uganda. Theoretical and Applied Climatology, 131, 295-308. https://doi.org/10.1007/s00704-016-1973-9
[24]
Agevi, H. (2020) Determination of Species Abundance, Diversity and Carbon Stocks in Kakamega Forest Ecosystem. Ph.D. Dissertation, Moi University, Eldoret. http://ir.mu.ac.ke:8080/jspui/handle/123456789/3101
[25]
Nicholas, K., Bernard, G., Bryson, N., Mukabane, K., Kilongosi, M., Ayuya, S. and Mulama, D.H. (2021) Abundance and Distribution of Malaria Vectors in Various Aquatic Habitats and Land Use Types in Kakamega County, Highlands of Western Kenya. Ethiopian Journal of Health Sciences, 31, 247-256. https://doi.org/10.4314/ejhs.v31i2.7
[26]
Edokpayi, J.N., Odiyo, J.O., Popoola, E.O. and Msagati, T.A. (2018) Evaluation of Microbiological and Physicochemical Parameters of Alternative Source of Drinking Water: A Case Study of Nzhelele River, South Africa. The Open Microbiology Journal, 12, 18-27. https://doi.org/10.2174/1874285801812010018
[27]
APHA [American Public Health Association] and American Water Works Association (1995) Standard Methods for the Examination of Water and Wastewater. Rice E.W., Ed., American Public Health Association, Washington DC, 10.
[28]
Crouse, K.K., Hardy, D.H., Heckendorn, S., Huluka, G., Joines, D.K., Kissel, D.E., et al. (2014) Soil Test Methods from the Southeastern United States. Southern Cooperative Series Bulletin No. 419, Southern Cooperative, Hampshire, 54-58. http://aesl.ces.uga.edu/sera6/MethodsManualFinalSERA6.pdf
[29]
Mehlich, A. (1953) Determination of P, Ca, Mg, K, Na, and NH4. North Carolina Soil Test Division, Mimeo, 23-89. https://www.ncagr.gov/AGRONOMI/pdffiles/mehlich53.pdf
[30]
Willis, R.B., Montgomery, M.E. and Allen, P.R. (1996) Improved Method for Manual, Colorimetric Determination of Total Kjeldahl Nitrogen Using Salicylate. Journal of Agricultural and Food Chemistry, 44, 1804-1807. https://doi.org/10.1021/jf950522b
[31]
Walkley, A. and Black, I.A. (1934) An Examination of the Degtjareff Method for Determining Soil Organic Matter, and a Proposed Modification of the Chromic Acid Titration Method. Soil Science, 37, 29-38. https://doi.org/10.1097/00010694-193401000-00003
[32]
Bouyoucos, G.J. (1962) Hydrometer Method Improved for Making Particle Size Analyses of Soils. Agronomy Journal, 54, 464-465. https://doi.org/10.2134/agronj1962.00021962005400050028x
[33]
Kilonzo, W., Home, P., Sang, J. and Kakoi, B. (2019) The Storage and Water Quality Characteristics of Rungiri Quarry Reservoir in Kiambu, Kenya, as a Potential Source of Urban Water. Hydrology, 6, Article No. 93. https://doi.org/10.3390/hydrology6040093
[34]
Yen, T.P. and Rohasliney, H. (2013) Status of Water Quality Subject to Sand Mining in the Kelantan River, Kelantan. Tropical Life Sciences Research, 24, 19-34. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3799407/
[35]
Aazami, J., Esmaili-Sari, A., Abdoli, A., Sohrabi, H. and Van den Brink, P.J. (2015) Monitoring and Assessment of Water Health Quality in the Tajan River, Iran Using Physicochemical, Fish and Macroinvertebrates Indices. Journal of Environmental Health Science and Engineering, 13, Article No. 29. https://doi.org/10.1186/s40201-015-0186-y
[36]
Vinita, J., Revichandran, C. and Manoj, N.T. (2017) Suspended Sediment Dynamics in Cochin Estuary, West Coast, India. Journal of Coastal Conservation, 21, 233-244. https://doi.org/10.1007/s11852-017-0494-8
[37]
Prasanna, M.B. and Ranjan, P.C. (2010) Physico Chemical Properties of Water Collected from Dhamra Estuary. International Journal of Environmental Sciences, 1, 334-342.
[38]
Ayuke, F.O. (2010) Soil Macrofauna Functional Groups and Their Effects on Soil Structure, as Related to Agricultural Management Practices across Agroecological Zones of Sub-Saharan Africa. Ph.D. Dissertation, Wageningen University and Research, Wageningen. https://edepot.wur.nl/138072
