Aside from Mananga and Kotkot-Lusaran Rivers, other major rivers in Cebu are Sapangdaku (in Toledo City), Guinabasan (in the town of Asturias), and Balamban (in the town of Balamban). These rivers are in the west side of Cebu (see Figure 4.1). Toledo City and the municipalities of Balamban and Asturias are connected by an arterial road known as the Toledo-Tabuelan-San Remigio Road. A reconnaissance survey was conducted on these rivers on July 11, 2014. Heavy rains fell on some parts of Cebu the night prior to the survey. This rainfall event might have some effects on the water level in the rivers observed during the survey.
Sapangdaku (Cebuano for big stream) River is situated at Toledo City with geographic coordinates of 10.394o N latitude and 123.65o E longitude and elevation of 22.2 meters. During the team’s visit to Toledo City, City Engr. Salvador P. Sanes assured the team of the city’s support to the Phil LiDAR 1 Project. In fact, he will let the City Survey Team headed by Engr. Alexander Dennis Abella to assist during field surveys.
Sapangdaku can be viewed from Dunlog Bridge as can be seen in Figure 4.2. The direction of current flow is towards the sea as shown. Figure 4.3 shows one side of the river viewed from Dunlog Bridge. Dense vegetation surrounding the station is evident. Dunlog Bridge is a possible site for hydrologic measurements. There is no automatic level sensor (AWLS) on the bridge
Balamban is a neighbouring town of Toledo City. It can be accessed through the Toledo-Tabuelan-San Remegio Road. The major river under Balamban’s jurisdiction is the Balamban River System, which is composed of Combado River, Bangbang River and other smaller rivers. The eastern part of Combado River is under the jurisdiction of Lusaran. Figure 4.4 illustrates a screenshot of Balamban River from Google Earth
Figure 4.7 shows the damaged spillway in Balamban River. This site is located at 10.527o N latitude and 123.725oE longitude at an elevation of 29.9 m along the river. The damaged spillway is an indication of the strength of the current during flooding, in which the water level on the average may reach up to 1.5 m. Sediments were also seen deposited at the river banks. The extent of the damage caused by the raging water on the banks can be seen in Figure 4.8. The waterway is visibly widened during flooding events which eventually leads to erosion.
Figure 4.9 shows a portion of Balamban River in Barangay Kantuod. This site is located at 10.517o N latitude and 123.714o Longitude at an elevation of 16.45 meters. The flow in this part of the river is already affected by the tides. During flooding events, water level can be as high as 1.2 meters as described by a resident in the picture on the right.
After the ocular survey, the team met the Mayor of Balamaban, Mayor Ace Stefan Binghay. He then expressed his support for the project. Located on the top of the Municipal Hall is one of the rain gauge stations of DOST.