Pollution Research Paper

Vol.20, Issue 02, 2001; Page No.(215-218)

ASSESSMENT OF NUTRIENTS IN URBAN STORM WATER RUNOFF IN MYSORE CITY

H.S. RAMESH, S. MAHESH, M. MAHADEVA SWAMY AND R.S. ABHIJIT

Abstract

Elevated levels and cumulative application of nutrients from uncontrolled urban storm water runoff induce weed and algal growth in lentic and lotic water bodies. Storm water runoff has been characterized for specific nutrients viz., PO42- and TKN for two urban microcatchments (MC1 and ma) of Mysore City; 16 storm events have been monitored for the estimation of nutrients for a period of one year. Storm water characterization reveals high nutrient concentrations during the initial flush of the storm event. The PO42- concentrations of 17.75 mgL-1 (MCI) and 16.25 mgL-1 (MC2) are much higher than desired; TKN values of 1.30 mgL-' (MC2) are within limits. Relating storm events with nutrient concentrations seem to be difficult due to the highly dynamic factors operating in urban land use. Storm water harvesting and removal of limiting nutrients from urban runoff are among the promising solutions in regulating the entry of nutrients into water bodies.

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