Eutrophic reservoir water suitability for irrigation in semi-arid region

Abstract Eutrophication is a common problem for the dams situated within an urban or agricultural catchment with high source of untreated plant nutrients. This can negatively affect hydro ecosystem, recreational and other uses water. On hand, such eutrophic could also be rich nutrients use. Thinking irrigation as alternative means reservoir water management, suitability was investigated Roodeplaat Dam, South Africa using physicochemical parameters recorded (1981–2017) at five sampling stations. Irrigation evaluated in terms nutrient content, salinity, soil infiltration, toxicity problems to irrigated plants. Plant nutrients: NH4_N, NO3_NO2_N, PO4_P, are normal range. But K above range use cause nitrogen deficiency. The salinity 0.44 dS/m found none restriction Na SAR Cl both surface sprinkler pH value 8.4 (6.5–8.4). Generally, quality categorized under C2S1 (medium low sodium hazard). slight moderate infiltration problem. Therefore, reservoirs potential readily available and, hence considered one remedial measures decrease accumulation reservoir. existing conveyance system used transport fields.