Underline the changes happening gradually in the sources of irrigation in U.P.

Older sources and the canal age

• Pre-colonial irrigation in the Ganga plain used wells, tanks, and flood-inundation; Bundelkhand depended more on tanks because hard rock made dense wells costly.
• The colonial Upper Ganga Canal from Haridwar, the Eastern Yamuna, Lower Ganga, and later the Sarda system created a command landscape in the western and central Doab that still exists.
• Canals raised wheat and sugarcane intensity in western U.P., but they also brought waterlogging and salinity in poorly drained pockets, which is why the source mix never stayed only canal.

Tubewell dominance and later shifts

• After Independence, and especially with the Green Revolution, private diesel and then electric tubewells overtook canals as the main source of net irrigated area in much of western and parts of central U.P.
• State tubewell schemes and rural electrification made groundwater the farmer’s on-demand source; canal water became a recharge and cheaper supplement rather than the only turn of the warabandi.
• Eastern U.P. lagged: shallower, flood-prone aquifers, weaker power, and smaller holdings kept a higher share of canals, tanks, and lift schemes relative to the west.
• From the 1990s–2010s, falling water tables in western districts, arsenic and iron trouble in some eastern blocks, and sodic soils in canal commands pushed policy toward lining, drainage, and now micro-irrigation.
• Solar pumps, drip for horticulture and sugarcane, sprinklers on light soils, and pond-recharge under watershed and MNREGA works are the latest layer—still a small share of area, but the direction of change.

What to underline

• The sequence is well and tank to canal to tubewell, with micro-irrigation as an emerging fourth stage.
• The social cost is groundwater mining in the west and uneven access where power and capital are weak.