| Title |
Development of a Flow Duration Curve with Unit Watershed Flow Data for the Management of Total Maximum Daily Loads |
| Authors |
박준대 ( Jun Dae Park ) ; 오승영 ( Seung Young Oh ) ; 최윤호 ( Yun Ho Choi ) |
| Keywords |
Daily flow estimation; Daily flow monitoring data; Flow duration curve; Regression analysis; Total Maximum Daily Loads; 8-day interval flow data |
| Abstract |
It is necessary to develop flow duration curve (FDC) on each unit watershed in order to analyze flow conditions in the stream for the management of Total Maximum Daily Loads (TMDLs). This study investigated a simple method to develop FDC for the general use of the curve. A simple equation for daily flow estimation was derived from the regression analysis between the 8-day interval flow data of a unit watershed and the daily flow monitoring data of an adjacent upstream region. FDC can be prepared with the calculation of daily flow by the equation for each unit watershed. An annual and a full-period FDC were drawn for each unit watershed in Guem river basin. Standard flow such as low and ordinary flow can be obtained from the annual FDC. Major percentile of flow such as 10, 25, 50, 75 or 90% can be obtained from the full-period FDC. It is considered that this simple method of developing FDC can be utilized more widely for the calculation of standard flow and the assessment of water quality in the process of TMDLs. |