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Daily reservoir sedimentation model: Case study from the Fena Valley Reservoir, Guam

Journal of Hydraulic Engineering

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https://doi.org/10.1061/(ASCE)HY.1943-7900.0001344

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Abstract

A model to compute reservoir sedimentation rates at daily timescales is presented. The model uses streamflow and sediment load data from nearby stream gauges to obtain an initial estimate of sediment yield for the reservoir’s watershed; it is then calibrated to the total deposition calculated from repeat bathymetric surveys. Long-term changes to reservoir trapping efficiency are also taken into account. The model was applied to the Fena Valley Reservoir, a water supply reservoir on the island of Guam. This reservoir became operational in 1951 and was recently surveyed in 2014. The model results show that the highest rate of deposition occurred during two typhoons (Typhoon Alice in 1953 and Typhoon Tingting in 2004); each storm decreased reservoir capacity by approximately 2–3% in only a few days. The presented model can be used to evaluate the impact of an extreme event, or it can be coupled with a watershed runoff model to evaluate potential impacts to storage capacity as a result of climate change or other hydrologic modifications.

Additional publication details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Daily reservoir sedimentation model: Case study from the Fena Valley Reservoir, Guam
Series title:
Journal of Hydraulic Engineering
DOI:
10.1061/(ASCE)HY.1943-7900.0001344
Volume:
143
Issue:
9
Year Published:
2017
Language:
English
Publisher:
ASCE
Contributing office(s):
California Water Science Center
Description:
Article 05017003; 11 p.