Water budget and mass balance in small ponds: Research study on small farm pond and regulation pond
2006
Tada, A.(Kobe Univ. (Japan). Faculty of Agriculture) | Kudara, M. | Tanakamaru, H. | Hata, T.
Water and mass budgets of small farm pond and regulation pond were estimated and discussed. As results, 35% of annual rainfall in the forested catchment flowed into the farm pond and 64.7% of that in domestic housing catchment flowed into the regulation pond. Water stored in the farm pond replaced 9.2 times by inflow annually on average (4.6 times based on inflow in low flow periods), and that in the regulation pond replaced 44 1 times (58 times in low flow periods). In both ponds, influent and effluent mass fluxes were almost balanced in M-Alkalinity and EC. Effluent fluxes were larger than influent fluxes in T-COD, D-COD and Ch1-a. Influent fluxes were larger than effluent fluxes in Si02. On the contrary, differences in the mass budget of nitrogen (N) and phosphorus (P) were recognized between two ponds. N fluxes were reduced or balances and P fluxes were increased in the regulation pond though total N and P fluxes were increased and dissolved component of N/P were decreased in the farm pond. These differences came from the differences in the speed of water replacement in two ponds, which would cause the differences in the production of the plant biomass inside ponds.
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