Nonpoint source pollution generally results from land runoff, precipitation, atmospheric deposition, drainage, seepage or hydrologic modification. Given the agriculture intensive economy in India, agricultural storm water discharges and return flows from irrigated agriculture are predominate sources under this category. The Point source means any discernible, confined and discrete conveyance and predominant contributors are Urban agglomerations and Industries. To carry out the assessment of pollutant load in macro level and in mirco level depending on the spatial scale, the land use and land cover assessment facilitates to quantify the total load into the lake system. The paper describes the methodologies adopted for carrying out such assessment for Kolleru Lake thereby to review the appropriate mitigation methods.