Large river projects are only one part of AP agriculture. Tanks, wells, borewells and small channels serve many fields, sometimes alongside major canals. Guntur's district page explicitly mentions tanks, filter points and tube wells in addition to the two major irrigation systems. The presence of a major canal in a district therefore does not mean every farm uses canal water. Groundwater levels and tank storage vary through the year.
Compare water source with application method. A well is a source; drip is a field delivery method. A tank stores local runoff; a barrage regulates a river for diversion. Rainfed cultivation depends chiefly on rainfall, though farmers may use supplementary irrigation. In a map, local tanks cannot be represented by one state-level pin; a project-level locator and an agronomic concept diagram serve different purposes. Check the latest groundwater or reservoir bulletin before quoting status.
Worked example: A village tank may store seasonal runoff while farmers also use groundwater. Their sources can interact: tank recharge can affect wells, and heavy pumping can lower local levels. A 'minor irrigation' category may include varied structures depending on the report. Do not equate the existence of a tank with reliable water availability in every Rabi season.
Active recall: Classify a tank, borewell, barrage and drip line by water-source or delivery role.