Research Article

Effects of Opened and Closed Spillway Operations of a Large Tropical Hydroelectric Dam on the Water Quality of the Downstream River

Table 1

Sampling stations with distance from Bakun Dam, GPS coordinates, location description, time, and weather conditions during opened and closed spillways.

Stations (distance from the Bakun Dam)GPS coordinatesLocation descriptionsOpened spillway (12 April 2016)Closed spillway (6 September 2016)
TimeWeatherTimeWeather

St. 1 (4.4 km)N02°46′21.8″, E114°01′41.6″Long Baagu12.14 pmSunny2.43 pmSunny
St. 2 (11 km)N02°47′02.0″, E113°58′43.2″Lubok Metjawah (right above Metjawah)11.34 amSunny2.16 pmSunny
St. 3 (20.1 km)N02°45′08.7″, E113°53′01.7″Right below longhouse Lehanan Long Somuang10.56 amSunny12.35 pmCloudy
St. 4 (28.5 km)N02°44′34.5″, E113°50′21.8″Right above longhouse Kejaman Neh10.22 amSunny11.52 amRaining
St. 5 (38.3 km)N02°42′02.9″, E113°46′46.3″Below Belaga Town9.33 amSunny10.58 amCloudy
St. 6 (50.3 km)N02°37′28.8″, E113°43′59.8″1 km above Dungan River4.38 pmSunny3.35 pmCloudy
St. 7 (63.7 km)N02°32′20.2″, E113°39′35.3″Right below Bungat River4.00 pmSunny2.49 pmDrizzling
St. 8 (81.3 km)N02°29′05.1″, E113°32′19.3″1 km above Punan Sama River3.15 pmSunny1.49 pmDrizzling
St. 9 (104.3 km)N02°23′41.7″, E113°22′34.6″1 km above Miah River1.56 pmCloudy1.03 pmCloudy
St. 10 (123.4 km)N02°19′23.5″, E113°14′32.2″1 km above Pila River1.15 pmSunny12.08 pmCloudy
St. 11 (131.9 km)N02°17′16.8″, E113°08′02.7″1 km above Merit River12.44 pmSunny11.07 amRaining
St. 12 (154.1 km)N02°15′46.9″, E113°08′54.6″1 km above Sama River11.43 amSunny10.28 amRaining
St. 13 (168.1 km)N02°11′21.6″, E113°07′57.9″1 km above Peraran Besai River11.04 amSunny9.51 amRaining
St. 14 (178.4 km)N02°10′54.9″, E113°03′36.4″Base of Pelagus Rapid (Kaki Wong)10.25 amSunny9.16 amSun shower
St. 15 (210 km)N02°01′06.5″, E113°00′29.4″1 km below Batu Arang (coal loading jetty)9.22 amSunny8.03 amSun shower