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Davao River
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 Mouth of the Davao River | |
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| Native name | Davohoho/Davohaha/Duhwow (Manobo languages) |
| Location | |
| Country |  Philippines |
| Region | |
| Province | Bukidnon |
| Physical characteristics | |
| Source | |
| • location | San Fernando, Bukidnon |
| Mouth | Davao Gulf |
• location | Davao City |
• coordinates | 7°02′54″N125°36′25″E / 7.04841°N 125.60699°E /7.04841; 125.60699 |
• elevation | 0 m (0 ft) |
| Length | 170 km (110 mi) |
| Basin size | 1,623 km2 (627 sq mi) |
| Discharge | |
| • location | Davao Gulf |
| • average | 80 m3/s (2,800 cu ft/s) |
| Basin features | |
| Tributaries | |
| • left | |
| • right | Salug River |
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TheDavao River is the third largest river bydrainage basin in the southernPhilippines on the island ofMindanao. It drains an area of over 1,700 square kilometres (660 sq mi) with a total length of 170 kilometres (110 mi). Most of the area is uplands. Average flows within the river near the mouth are estimated at 70 to 80 cubic metres per second (2,500 to 2,800 cu ft/s). The climate type is relatively uniform throughout the year with evenly distributedrainfall andtemperatures and humidity (rainfall = 2600mm, Actual Evap 1028mm). The area rarely experiences typhoons.
Plains and Valley: Parent Material:
Intermediate Upland:
Hills and Mountains:
Thelandform and landcover within the basin is highly diverse. Ranging from lowland urban, agricultural, wetland andmangrove to natural riparian, plantations, upland agriculture and mountainous forest including primary forest. The area is classified by DENR as 77.5% forestlands and 22.5% alienable and disposable land. This is not a true land uses (or land cover) classification. Detailed land use is not available. Information is available from several sources including the Comprehensive Land Use Plan of the City, however this data is as yet theoretical and does not represent the realities or suitability of land at the barangay (lowest tier of local government) level. However the City Planning Office is collecting and digitizing data for land use maps.
River discharge measurements taken from 1984 to 1990 indicated an average river flow of approximately 78 cubic meters per second for the period.
The maindrinking water sources for Davao City are in the neighboring Talomo watershed. These sources are under pressure and the Davao River Basin is likely to be required for water abstraction in the near future.
The Environmental Management Bureau samples 8 sites from the confluence of the Tamugan river downstream to the mouth of the river. From the Tamugan River confluence with the Davao River down stream to DDF Subdivision, Mandug the water is classified as Class A – Public Water Supply Class II. Downstream of this point to the sea is classified as Class B or recreational water class I. Analyses fordissolved oxygen over the past 4 years has indicated no significant change in quality. The current monitoring of water quality is insufficient to monitor and evaluate pollution levels and trends in the river.
The construction of the Davao River Bridge is a 1.34-kilometer ₱3.126 billion project, funded by the Government and China Aid Grant. Located inBucana, it is complementary to the Davao City Coastal Road as it includes the approach roads of the Davao City Coastal Bypass Road as transversal from Roxas Avenue to Bago Aplaya. Under theBuild Better More per contractorChina Road and Bridge Corporation, the four-lane, six-spanextradosed bridge with a 480.20 metersspan across the Davao River started in November 2023 and is 32.13% complete.
Currently, the bridgecivil engineering includesrebars installation forpier columns andcrossbeams,scaffoldings placement prefatory todeck construction, steel sheetpile driving forcofferdam anddeep foundation.[2]
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