Republic of the Philippines
DEPARTMENT OF PUBLIC WORKS AND HIGHWAYS
REGIONAL OFFICE VII
INSPECTION REPORT
Title
: CARMELO RIVER AND LANGUYON RIVER AT TUBURAN, CEBU
Date of Inspection : June 29, 2023
I. Executive Summary
The purpose of this inspection report is to assess the current condition of Languyon River and
Carmelo River and provide recommendations for dredging, if necessary. The inspection
revealed significant sediment buildup and potential navigational issues in both rivers,
indicating the need for immediate action to restore their functional capacities. Dredging is
recommended to mitigate the adverse effects of sediment accumulation and ensure the
sustainable use of these waterways.
II. Background
The Municipality of Tuburan is a 2nd class municipality in the province of Cebu, Philippines.
According to the 2020 census, it has a population of 68,167 people. Languyon River and
Carmelo River are prominent water bodies located in the municipality of Tuburan. These rivers
play a vital role in the local ecosystem and serves as the main water supply for agricultural
crops in the area. However, due to natural sedimentation and anthropogenic activities, the
rivers have experienced a significant buildup of sediment, which can impede navigation,
disrupt aquatic habitats, and increase the risk of flooding during heavy rainfall events.
III. Inspection Findings
A. Languyon River (see Annex A)
Sediment Accumulation. The inspection revealed a substantial accumulation of sediment
along the riverbed, resulting in reduced water depth in certain areas. This sediment buildup
poses a navigational hazard for boats and other vessels, especially during low tide.
Increased Flooding Risk. The sediment accumulation has also caused a narrowing of the
river channel, potentially leading to increased flood risk during periods of heavy rainfall. The
reduced capacity to accommodate water flow may result in water overflowing its banks and
causing damage to nearby crops and properties.
B. Carmelo River (see Annex B)
Sediment Buildup. Similar to Languyon River, Carmelo River exhibits a significant buildup
of sediment, leading to shallow areas and potential navigational challenges for boats and
vessels.
Erosion and Bank Instability. The sediment accumulation has also resulted in increased
erosion and instability of the riverbanks, particularly in areas with steep slopes. This erosion
threatens adjacent houses, including roads, and bridges.
Water Quality Implications. The sedimentation can contribute to poor water quality by
trapping pollutants and nutrients, potentially leading to eutrophication and harming the overall
health of the river ecosystem.
IV. Recommendations
Based on the findings of the inspection, it is recommended that dredging operations be
conducted in both Languyon River and Carmelo River. The following actions are
recommended:
A. Dredging. A comprehensive dredging program to remove the accumulated sediment
and restore the original water depth along the affected stretches of both rivers; An
estimated volume of three hundred thousand cubic meters (350,000.00 cu.m.),
with an area of one hundred thirteen thousand three hundred sixty-six square
meters (113, 366 sq.m.) and five hundred thousand cubic meters (500,000.00
cu.m.), with and area of one hundred thousand eight hundred seventy-four
square meters (100,874.00 sq.m.), will be dredged on Carmelo River and on
Languyon River, respectively; Implement environmentally sustainable dredging
practices to minimize potential impacts on the surrounding ecosystems and aquatic life
and; Monitor the dredging process closely to ensure its effectiveness and adjust the
operation if necessary.
B. Maintenance. Develop a long-term maintenance plan to regularly monitor and
address sedimentation issues in the rivers; Implement sediment control measures in
upstream areas to minimize the influx of sediment into the rivers and; Coordinate with
local authorities and stakeholders to raise awareness about the importance of
responsible waste management and the prevention of activities that contribute to
sedimentation.
C. Environmental Considerations. Conduct a Programmatic Environmental Impact
Assessment (PEIA) prior to dredging activities to identify potential risks and develop
appropriate mitigation measures; Ensure compliance with all relevant environmental
regulations and guidelines during the dredging process and; Monitor water quality,
aquatic life, and river ecosystem health during and after the dredging operations to
assess the effectiveness of the measures taken.
V. Conclusion
Languyon River and Carmelo River require immediate attention to address the significant
sedimentation issues affecting their functionality and the surrounding environment.
Inspected by:
BRYAN S. SUAREZ
Chief, Floating Equipment Section
Annex A. PHOTO DOCUMENTATION WITH GEOTAG OF LANGUYON RIVER
Annex B. PHOTO DOCUMENTATION WITH GEOTAG OF CARMELO RIVER