कृषि इंजीनियरिंग में दलदली भूमि (swampy land) को किस प्रकार परिभाषित किया जाता है?

To reclaim salt-affected land, the accumulated salts must be leached out from the root zone by supplying:

In a canal outlet, which type of module maintains a constant discharge irrespective of fluctuations in water levels in both the distributing channel and the field channel?