Vojislav ĐEKOVIĆ, Aleksandar ANĐELKOVIĆ, Neđo MILOŠEVIĆ, Grozdana GAJIĆ & Milorad JANIĆ
Belgrade University, Faculty of Forestry, Kneza Višeslava 1, 11030 Belgrade, Serbia, E-mail:
aleksandar.andjelkovic@sfb.bg.ac.rs

EFFECT OF RESERVOIR ON FLOODWAVE TRANSFORMATION

Full text

Reservoir effects on floodwave transformation were calculated based on the concrete research.The procedure was based on the definitions of the distribution of inflow and outflow hydrograph timebases. The inflow-outflow hydrograph was divided into time intervals. The volume of inflow water in thereservoir was calculated for each interval, as well as the volume of water released from the reservoir. Lagtime was calculated as the time between peak inflow to the reservoir and peak outflow from it at thespillway. The study analysis can be used as a guideline for the calculation of correct dimensions and theprotection of earthfill dams from overtopping. In this way, especially in earthfill dams, a significantsaving of material incorporated in the spillway parts is achieved, and general stability of earthfill dams isensured. Based on the conducted research, it can be concluded that there is a transformation of the inflowfloodwave through the reservoir. In the case when the reservoir is full, i.e. the elevation of water level inthe reservoir at the moment of floodwave arrival is at the elevation of the spillway crest, the reduction rateof the outflow hydrograph is 25, 73%. Calculation is possible only based on the volume method orreservoir filling within a given time period. The increase in the water level at the spillway is in thefunction of inflow-outflow volume of water and the surface of water table in the reservoir.