In light if the Typhoon Sendong which triggered flashfloods in Cagayan de Oro City, here are some basic facts about Rio Verde’s Bulk Water Supply facility located in Pualas, Baungon, Bukidnon. Shown above is the INFILTRATION GALLERY. This is where freshwater from Bubunawan River first enters the facility.
As shown in the google-earth image below, there is no dam structure but more of a diversion channel. While a portion of the river finds its way into infiltration gallery, a huge portion still flows through the river course. The infiltration gallery is used to collect water from the river. As per wikipedia, infiltration gallery has the advantage of bank filtration to reduce the water treatment requirements for a surface withdrawal. Click image for larger view.
Below is a close up of the INTAKE PUMPING STATION as reflected in the google-earth image above.
Below are the huge intake pumps inside the said station.
Below is the control center for the motors running the pumps.
This is the ABSTRACTION AREA. Water abstraction or water extraction is the process of taking water from the river.
Below is the WATER TREATMENT PLANT AREA where chlorination is undertaken.
The facility’s laboratory ensures the potability of the product water.
SLUDGE LAGOON is where the wastes from the process are temporary kept. Sludge is produced during water treatment where elements of impurities in water eventually build up. Sludge may also contain sediments from the river. You can clearly see the lining beneath the sludge which means it prevents seepage into the ground.
Below is the Chemical Dosing Building where the water is dosed with chlorine gas.
Shown below are some of the transfer pumps.
Below is a google-earth image of the treatment facility.
Below is the pipe bridge which transports the final product potable water to an off-take point near Pueblo de Oro. This was destroyed by the flood.
Below is a google-earth image of the pipe bridge. The road at right serves as the main entrance road to the facility.
Here’s a larger google-earth map showing all of Rio Verde’s facilities.
The facility has been operating since January 2007. The infrastructure is designed for 150,000 m3/day of potable water production. Now, take a look of the google-earth image below showing the area just south of Rio Verde’s facilities.
As shown in the map, Cabula Bridge is located upstream of the confluence of Bubunawan and Cagayan de Oro River. The bridge, which is approximately 2.4 kilometers upstream of the confluence, links the town of Baungon to Cagayan de Oro City. Below is a photo of the bridge before it was destroyed by Sendong.
Whitewater rafting adventurers often jump from the bridge as a sign of “graduation” of the rafting course.
After Sendong, the bridge is gone and mangled by the floodwaters which witnesses say where as high as the bridge level. Floodwaters from the Bubunawan River could not have destroyed the bridge because it is located in another river upstream of the confluence.
Now, rumors are circulating about a dam break as a cause of the flood. I don’t buy it. What’s your idea…?