In the Indira Gandhi Canal Command Area (IGCCA), the area on the left side of the main canal is at a higher elevation. Therefore, water cannot reach this side naturally by gravity and requires lift irrigation, where water is pumped to irrigate the fields.
The other options are incorrect:
(A) The right side is generally irrigated using gravity flow.
(C) and (D) are vague and do not specifically relate to the canal layout.