Under Article 6A, during the dry season for planning purposes, it has been agreed to take forward a range of possible flow frameworks to test how they perform in guiding planning decisions in the future.
A considered scenario could NOT be deemed acceptable for planning purposes if the monthly average discharge simulated by the DSF is below the lower bound for one or more months of the dry season at one or more of the selected hydrological stations.
The acceptable flows framework is based on the monthly average observed discharge in the dry season (December - May) during 1986-2000, as simulated by the Baseline scenario in the DSF at each of the selected hydrological stations .
| Article reference | Flow framework for planning purposes | |
|---|---|---|
| Article 6A | Acceptable minimum monthly natural flow during each month of the dry season | The following flows frameworks and associated thresholds will be tested:
|
| Station | ARI | Dec | Jan | Feb | Mar | Apr | May |
|---|---|---|---|---|---|---|---|
| Chiang Saen |
ARI 1:4
ARI 1:5 |
1,432
1,398 |
1,074
1,051 |
859
837 |
754
731 |
767
735 |
1,111
1,057 |
| Vientiane |
ARI 1:4
ARI 1:5 |
2,193
2,134 |
1,537
1,506 |
1,140
1,117 |
957
928 |
1,034
996 |
1,532
1,451 |
| Khong Chiam |
ARI 1:4
ARI 1:5 |
3,297
3,222 |
2,253
2,210 |
1,599
1,562 |
1,287
1,246 |
1,372
1,325 |
2,151
2,022 |
| Pakse |
ARI 1:4
ARI 1:5 |
3,539
3,442 |
2,387
2,341 |
1,719
1,677 |
1,378
1,335 |
1,467
1,418 |
2,187
2,056 |
| Stung Treng |
ARI 1:4
ARI 1:5 |
5,592
5,453 |
3,362
3,287 |
2,363
2,300 |
1,908
1,856 |
1,866
1,799 |
2,713
2,526 |
| Kratie |
ARI 1:4
ARI 1:5 |
5,806
5,657 |
3,457
3,375 |
2,413
2,345 |
1,935
1,881 |
1,870
1,801 |
2,748
2,555 |
| Chrouy Changvar |
ARI 1:4
ARI 1:5 |
6,112
5,952 |
3,564
3,476 |
2,497
2,427 |
1,952
1,897 |
1,891
1,823 |
2,679
2,498 |
| Tan Chau |
ARI 1:4
ARI 1:5 |
9,616
9,402 |
6,067
5,913 |
4,038
3,913 |
2,595
2,500 |
2,078
1,993 |
2,590
2,447 |
| Chau Doc |
ARI 1:4
ARI 1:5 |
1,435
1,369 |
566
539 |
257
242 |
148
139 |
115
107 |
188
172 |
| Note: ARI 1:5 = 80% probability of exceedance and ARI 1:4 = 75% probability of exceedance. | |||||||
| Station | ARI | Dec | Jan | Feb | Mar | Apr | May |
|---|---|---|---|---|---|---|---|
| Chiang Saen |
FDC 80%
FDC 90% |
1,379
1,281 |
1,031
985 |
834
796 |
733
679 |
752
669 |
1,026
906 |
| Vientiane |
FDC 80%
FDC 90% |
2,049
1,919 |
1,442
1,368 |
1,093
1,047 |
929
878 |
1,013
863 |
1,379
1,211 |
| Khong Chiam |
FDC 80%
FDC 90% |
3,001
2,789 |
2,121
1,968 |
1,503
1,403 |
1,244
1,142 |
1,271
1,171 |
1,758
1,586 |
| Pakse |
FDC 80%
FDC 90% |
3,133
2,888 |
2,292
2,148 |
1,611
1,502 |
1,319
1,224 |
1,371
1,272 |
1,829
1,654 |
| Stung Treng |
FDC 80%
FDC 90% |
4,990
4,439 |
3,185
2,932 |
2,209
2,012 |
1,912
1,653 |
1,778
1,614 |
2,206
1,923 |
| Kratie |
FDC 80%
FDC 90% |
5,151
4,605 |
3,260
3,019 |
2,239
2,036 |
1,938
1,679 |
1,772
1,615 |
2,218
1,950 |
| Chrouy Changvar |
FDC 80%
FDC 90% |
5,445
4,806 |
3,329
3,076 |
2,342
2,058 |
1,945
1,729 |
1,775
1,629 |
2,190
1,957 |
| Tan Chau |
FDC 80%
FDC 90% |
9,048
8,175 |
5,667
5,154 |
3,718
3,277 |
2,382
2,130 |
1,916
1,713 |
2,217
2,014 |
| Chau Doc |
FDC 80%
FDC 90% |
1,184
976 |
484
404 |
207
163 |
140
107 |
109
81 |
160
135 |
| Station | Dec | Jan | Feb | Mar | Apr | May |
|---|---|---|---|---|---|---|
| Chiang Saen | 1,593 | 1,185 | 965 | 870 | 940 | 1,430 |
| Vientiane | 2,480 | 1,682 | 1,249 | 1,100 | 1,231 | 2,016 |
| Khong Chiam | 0 | - | - | - | - | - |
| Pakse | 4,010 | 2,598 | 1,917 | 1,598 | 1,716 | 3,078 |
| Stung Treng | 6,242 | 3,713 | 2,668 | 2,163 | 2,210 | 4,013 |
| Kratie | 6,518 | 3,850 | 2,740 | 2,197 | 2,232 | 4,113 |
| Chrouy Changvar | 0 | - | - | - | - | - |
| Tan Chau | 10,591 | 6,793 | 4,630 | 3,072 | 2,490 | 3,462 |
| Chau Doc | 1,792 | 714 | 343 | 213 | 180 | 318 |
