Water logging in bangladesh
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Waterlogging occurs when the water table rises high enough through capillary action that it prevents anticipated land use. It adversely affects plants, animals, and humans. Some key causes of waterlogging in Dhaka, Bangladesh include inadequate drainage systems, filling in of wetlands and canals for construction, and heavy rainfall during the monsoon season that cannot be carried away by blocked canals. This results in flooded roads and neighborhoods for days. Solutions proposed include improving surface drainage, reducing water flow from canals, restricting irrigation, removing obstructions from natural drains, and adopting sprinkler irrigation.
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Water logging in bangladesh
- 2. If water table rise to such a level through capillary action to the surface & root zone, that it cannot conveniently permit an anticipated activity this situation is called WATER LOGGING. It is a disturbing phase and adversely affect plant, animal and human being, as waterlogging is unexpected consequence of the area and landscape, that is an adverse out come of human intervention on the wetlands along with climate change. INTRODUCTION
- 3. CAUSES FOR WATERLOGGING Inadequate surface Drainage Seepage from canal system Over irrigation of fields Obstruction of natural drainage Impermeable clay layer below the soil Obliteration of natural drainage Inadequate capacity for arterial drainage Construction of a water reservoir Natural obstruction to the flow of ground water
- 5. Water Logging in Dhaka Water logging is one of the prime urban problem that Dhaka suffering for decades. Even after a light rain many areas of the Dhaka turned out to be small islets with thousands stranded or wallowing through knee-deep dirty waters stuck up in roads and streets. If the rain lasts for hours it changes the view of the Dhaka city - most of the busy roads and streets become inundated because canals, being the primary drainage system of the city are blocked, cannot carry the huge volume of storm water.
- 6. Structural Causes: Dhaka has a tropical wet and dry climate. The monsoon season brings nearly 80% of the annual average rainfall of 1,854 millimeters (73 in) occurs between May and September. Those and driven rainwater by circulated rivers around the city is the major source of water logging and the city become swamp due to the drainage congestion. Shrinkage of the natural drainage and wetlands by unauthorized land filling and illegal construction over canal. Secondly, urban land covered by solid and resistant surface doesn’t let natural infiltration of rainfall into the ground. Rapid population Growth.
- 7. Management Causes: Governing authorities do not have a long-term and coordinated plan to address the water logging problem. The government had no control over the unauthorized and unplanned development occupying canals and water bodies in and around the city. Unorganized digging of road at the edge of monsoon by WASA, RAJUK, City Corporations and private developers Behavioral causes: Solid Waste Dumping on natural canals. Lack of awareness of local people and government agencies.
- 8. EFFECTS OF WATERLOGGING Inhabiting activity of soil bacteria. Decrease in available capillary water Fall in soil temperature Defective air circulation Rise of salt Delay in cultivation operations Growth of flora Adverse effects on community health Less availability of oxygen
- 9. Providing efficient surface Drainage. Reducing percolation from canals. Restriction of irrigation. Adoption of sprinkler method for irrigation Removing obstructions in natural drainage Preventive Measures Re-modeling of Surface Drains Canal Lining