APPLICATION OF MORPHOLOGIC ANALYSIS TO QUANTIFY DIVERSION OF FLOOD WATERFLOW AND POTENTIAL ELECTRICAL ENERGY

Abstract

As significant catchment of flood water, this study examined important morphological structures of Lake Buhi (LB) catchment area which is a part of Bicol River Basin Area (BRBA). The information taken was used to derive a mathematical model which was then used in analysing the hydrologic event in the area. Different scenarios were investigated to provide solutions and avoid major risks and damages in BRBA during extreme precipitation. The method used to gather the data are Geographical Information System (GIS), digital elevation modelling (DEM), hydrologic modelling, site visit, and remote sensing. It was found that the morphology is well structured to collect and impound vast amount of rainwater flow and form huge body of water known as the LB. The area has immense number of streams that directs surface runoff into the impounded body of water having low drainage density. Enormous amount is needed to discharge away and prevent high water level rise and stop flood in the nearby villages. The capacity of the outflow river is sufficient in most cases of the forecasted precipitation while during the time of typhoon event was found insufficient. However, there are three options to divert away the accumulated floodwater and become a potential source of electrical energy.