| ช่วงฤดูแล้ง (ม.ค. - มิ.ย.) | ปริมาณน้ำต้นทุน | แผนการระบายน้ำ | ระบายน้ำจริง | มาก/น้อยกว่าแผน |
| 2545 | 10,569 | 4,000 | 5,131 | 1,131 |
| 2546 | 11,764 | 4,000 | 6,165 | 2,165 |
| 2547 | 9,549 | 4,500 | 5,142 | 642 |
| 2548 | 7,589 | 4,500 | 5,074 | 574 |
| 2549 | 9,437 | 5,250 | 5,243 | -7 |
| 2550 | 10,984 | 5,600 | 5,867 | 267 |
| 2551 | 10,593 | 5,600 | 6,054 | 454 |
| 2552 | 9,498 | 5,600 | 5,419 | -181 |
| 2553 | 9,667 | 5,600 | 6,191 | 591 |
| 2554 | 5,405 | 4,300 | 4,201 | -99 |
| 2555 | 9,357 | 7,500 | 6,501 | -999 |
| 2556 | 9,436 | 7,000 | 6,673 | -327 |
| 2557 | 9,257 | 6,000 | 6,191 | 191 |
| 2558 | 4,900 | 1,975 | 2,887 | 912 |
| 2559 | 4,748 | 2,950 | 3,148 | 198 |
| 2560 | 6,016 | 2,950 | 3,296 | 346 |
| 2561 | 9,052 | 5,008 | 4,393 | -615 |
| 2562 | 10,179 | 5,700 | 5,597 | -103 |
| 2563 | 8,688 | 6,100 | 5,790 | -309 |
| 2564 | 4,590 | 3,800 | 3,696 | -104 |
| 2565 | 10,552 | 5,500 | 6,333 | 833 |
| 2566 | 8,417 | 5,500 | 5,114 | -386 |
| 2567 | 8,874 | 5,000 | 5,525 | 525 |
| 2568 | 8,702 | 5,500 | 5,358 | -142 |
| 2569 | 10,143 | 3,243* | 4,409* | 1,165* |