Post on 22-Mar-2022
WHAT IS THE FUNCTION OF A
DAM?
DAMS PROVIDE A MEANS OF
REGULATING DOWNSTREAM
SURFACE WATER FLOWS OVER
SPACE AND TIME BY ALTERING THE
NATURAL SPATIAL AND TEMPORAL
DISTRIBUTIONS OF STREAM FLOWS.
SNSCE/CIVIL/KEERTHI KUMAR B/GE8071 - DM - Unit 3
WHY BUILD DAMS?
TO IMPROVE THE QUALITY OF HUMAN LIFE BY PROVIDING……
WATER QUALITYIRRIGATION SNSCE/CIVIL/KEERTHI KUMAR B/GE8071 - DM - Unit 3
ENVIRONMENTAL IMPACTS OF DAMS
➢ Terrestrial Ecosystems and Biodiversity
➢ Greenhouse Gas Emissions
➢ Downstream Aquatic Ecosystems and Biodiversity
➢ Impacts of changes in flow regimes
➢ Impacts of trapping sediments and nutrients behind a dam
➢ Blocking migration of aquatic organismsSNSCE/CIVIL/KEERTHI KUMAR
B/GE8071 - DM - Unit 3
NON RECIPROCAL EFFECTS OF DAMS ON SOCIETY
▪ Hydropower
▪ Irrigation, Drainage & Flood control
▪ Displacement of People and Livelihoods
▪ Downstream Livelihoods
▪ Cultural Heritage
▪ Under-counting of the displaced
▪ Physically displaced populations enumerated but not resettled
▪ Socio-economic Impacts through the Planning and Project CycleSNSCE/CIVIL/KEERTHI KUMAR B/GE8071 - DM - Unit 3
DAM FAILUREMAIN CAUSES OF DAM FAILURE-
▪ EARTHQUAKES
▪ EXTREME INFLOW
▪ POOR MAINTENANCE , ESPECIALLY OF OUTLET PIPES
▪ HUMAN, COMPUTER OR DESIGN ERROR
▪ INTERNAL IRROSION OR PIPING, ESPECIALLY IN EARTHEN DAMS
▪ SLIDING OF MOUNTAIN INTO RESERVOIR
▪ SUB-STANDARD CONSTRUCTION MATERIALS/TECHNIQUES
▪ SPILLWAY DESIGN ERROR
▪GEOLOGICAL INSTABILITY CAUSED BY CHANGES TO WATER LEVELS DURING FILLING OR POOR SURVEYINGSNSCE/CIVIL/KEERTHI KUMAR
B/GE8071 - DM - Unit 3