| Study sites | Sampling sites | Major land use activities | Major crops |
| Chemosit river | Upstream | Indigenous Forest | None |
| Midstream | Tea growing, tree farming, food crop, livestock keeping and urban land. | Tea, maize, bananas, beans and pineapples | |
| Downstream | Food crop farming, tree farming and livestock keeping | Maize, pineapples, beans and bananas | |
| Kipsonoi river | Upstream | Indigenous Forest | None |
| Midstream | Food crop farming, tree farming, livestock keeping and urban land | Bananas, maize, kales, finger millet, sorghum and beans | |
| Downstream | Food crop farming, tree planting, livestock keeping and urban land. | Sugarcane, maize and beans |