Major Areas :: Disaster Management :: Drainage
The adverse effects of waterlogging can be reduced to some extent by supplying nitrogenous fertilizers. The best method of avoiding waterlogging is by providing suitable drainage.
Agricultural drainage is the provision of a suitable system for the removal of excessive irrigation or rain water from the land surface so as to provide suitable soil conditions for better plant growth.
Advantages of agricultural drainage
Drainage for agricultural land is provided by surface and subsurface drainage.
Advantages of surface drainage
Disadvantages in surface drainage system
Different methods of surface drainage
Random Field Ditch Method
Standing water may be present in the field at several places distributed randomly. These depressions or micro ponds are connected by mean of shallow channels or ditches and these are led into an outlet.
The elevated area is cut off and excess soil is spread over low areas so that the surface is even with uniform slope. Excess surface run off is collected and conveyed into the field ditches provided at the lower end of the field.
Small furrows are formed at known intervals parallel to the slope for draining out water. These furrows are known as dead furrows and land between these furrows is known as beds. Small ridges or bunds are made at the centre of the bed with gradual slope to drain water into the dead furrows.
Parallel Field Ditch system
It is almost similar to bedding system except for deep drains and uneven interval between drains.
Broad Bed and Furrow Method
The field is laid out with beds and wide furrows across the slope. About 0.5 per cent slope is provided for the furrows for free drainage. Crops are sown on the beds and furrows help in drainage of water when there is excess rain.