sedimentation survey/study for yeleswaram and velugodu balancing reservoirs in andhra pradesh under national hydrology project ( nhp ) , services , ( i ) establishment reference control points in the foreshore of the reservoir with dgps on the existing permanent features etc . , complete for finished item of work and as directed by engineer in charge at site of work ( ii ) carrying dcbm along the foreshore of reservoir with auto level etc . , complete for finished item of work and as directed by the engineer-in-charge at site of work , conduct hydrographic and topographic survey to cover the entire area of the reservoir up to full reservoir level ( 30 m x 30 m grid for hydrographic survey using ibs and 30m x 30m grid for topographic survey ) . , preparation of contour plan with 1ft/0 . 3m interval and area capacity tables and curves etc complete for finished item of work and as directed by the engineer-in-charge . , assessment of the nature of sedimentation and causes for it . , analysis of sediment data at various locations within the reservoir ( to estimate the sedimentation of reservoir in different zones namely ( a ) dead storage ( b ) live storage ( c ) flood storage , if any ) , recommendation of suitable measures for increased benefits and enhanced life of a reservoir . customization of sedimentation model , preparation of reports , printing , binding and submitting copies complete for finished item of work and as directed by the engineer-in-charge . ( five hard copies )