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Rain and groundwater as phosphorus sources of a small reservoir
Author(s) -
Miranda Sebastião A.,
Matvienko Bohdan
Publication year - 2003
Publication title -
lakes and reservoirs: research and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.296
H-Index - 39
eISSN - 1440-1770
pISSN - 1320-5331
DOI - 10.1046/j.1440-1770.2003.00206.x
Subject(s) - groundwater , hydrology (agriculture) , wet season , dry season , environmental science , phosphorus , outflow , hydroelectricity , sedimentation , geology , sediment , geography , ecology , geomorphology , oceanography , geotechnical engineering , materials science , metallurgy , cartography , biology
At Broa hydroelectric reservoir 82% of phosphorus (P) input is from rivers, 12% from groundwater seepage input and 6% from direct rainfall. The reservoir retains 15% of incoming P, corresponding to 73 mg/m 2 /year sedimentation. Proportions of water input are 36% from groundwater seepage in the dry season and 68% from seepage and 3% from direct rainfall in the rainy season; the remainder comes from rivers. Average P concentration during the 1996 rainy season was 27 μg/L in rain, 6.1 in groundwater, 68.54 in rivers and 33.56 in outflow.