Water resource planning involves estimating future water demand, evaluating potential new water sources, protecting water resources, and expanding environmental regulations. Better water resource management benefits society and the government alike. Water management makes it possible to save water and sewer costs, improve summertime irrigation control, and spend less energy. Water is kept clean and safe thanks to good management, which safeguards the general public's health. The Priority Ranking for Institutional Method for Enrichment Evaluation (PROMETHEE), a technique, aids decision-makers in a university in choosing the best candidates for admission. The Prometheus and Gaia approach was created in the early 1980s and has since undergone substantial research and development. It is based on mathematics and sociology. It is utilised globally in a variety of decision-making circumstances in industries like business, government, transportation, healthcare, and education. It has a specific application in decision-making. Development of new groundwater resources close to Kitchener-Waterloo under Build dual-purpose recharge and recovery wells at the Mannheim site in accordance with A3, Aquifer Recharge, Option 1 (AQ), with a capacity of 10 million imperial gallons per day (MIGD), in accordance with A1, Groundwater, Option 1 (GW1); A2, Groundwater, Option 2 (GW2)—The creation of additional fields with groundwater resources, primarily in the South Woolwich, Roseville, and St. Agatha sectors; and A4, (GR): Use the Grand River to obtain water when necessary; A5, Grand River Low Flow Augmentation (LF1)—Construct West Montrose Dam to boost the Grand River's water flow; A6, Grand River Low Augment (LF2), which will increase the amount of water pumped into the Grand River; A7, Grand River Low Flow Augmentation (LF3), which increases the flow of the Great River by piping water from Lake Huron into it; A8, Pipeline (PL1), a high-pressure water pipeline that supplies the region with water a high-pressure pipeline that uses to transport water from Lake Erie to the region; A10, Pipeline (PL3)—Use to transport water in God's Country to the area. INVEST (−) is in the highest value is the RISK (−) lowest value.