| Station: | San Marcos | Continent: | North America | ||
| River: | Lempa | Major Basin : | Pacific Ocean | ||
| Country: | El Salvador | Discharge into : | Pacific Ocean | ||
| Observation Period: | 1969 - 1980 | Total Months: | 88 | ||
| Latitude (dec deg): | 13.43 N | Area (km2): | 18246 | ||
| Longitude (dec deg): | 88.7 W | Elevation (m): | 5 | ||
| Annual Discharge: (m3/s): | 404.0 | (km3/yr): | 13.8 | ||
| Annual Runoff: (l/s/km2): | 23.9 | (mm/yr): | 755.3 |
| Mean for Observation Period | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| m3/sec | 103.4 | 94.2 | 87.1 | 89.5 | 180.6 | 560.3 | 601.7 | 863.3 | 1283.7 | 969.0 | 254.2 | 137.8 |
| km3/mo | 0.3 | 0.2 | 0.2 | 0.2 | 0.5 | 1.5 | 1.6 | 2.3 | 3.3 | 2.6 | 0.7 | 0.4 |
| mm/mo | 15.2 | 12.5 | 12.8 | 12.7 | 26.5 | 79.6 | 88.3 | 126.7 | 182.4 | 142.2 | 36.1 | 20.2 |
| l/s/km2 | 5.7 | 5.2 | 4.8 | 4.9 | 9.9 | 30.7 | 33.0 | 47.3 | 70.4 | 53.1 | 13.9 | 7.5 |
