| Sources of Water | Parameter | Rwanda | Panama | Zambia | Tanzania | Suriname | Nepal | Sri Lanka | S. Sudan |
| Rainfall | Average annual total (mm) | 800 - 2400 | Coasts 2600 - 5500, Mountain ranges 4000 - 7000, Azuero Peninsula 1000 - 1500 | 900 - 1500 | 1000 - 3000 | 1750 - 3000 | 500 - 2500 | 1750 - 2500 | |
| Rainfall Distribution | Uneven and erratic | Uneven and erratic | Uneven and erratic | uneven and erratic | uneven distribution | Uneven | Uneven | Uneven | |
| Other sources | Lakes, Rivers | Lakes, Rivers, Ground water | Lakes, Rivers, Ground water | Ocean, lake, river and under-ground | rivers, lakes, fresh water swamps | Rivers, lakes, under-ground | Rivers, lakes, Reservers, Agro well | Lake, Rivers | |
| Quantity | 150,369 mm3/year | 210,200 mm3/yr |