| Title |
Development and Application of Coliform Load Duration Curve for the Geumho River |
| Authors |
정강영 ( Kang Young Jung ) ; 임태효 ( Tae Hyo Im ) ; 김경훈 ( Gyeong Hoon Kim ) ; 이인정 ( In Jung Lee ) ; 윤종수 ( Jong Su Yoon ) ; 허성남 ( Seong Nam Heo ) |
| Keywords |
Fecal coliform; Flow duration curve; Load duration curve; Total coliform |
| Abstract |
Duration curves describe the percentage of time that a certain water quality (total/fecal coliform (=TC/FC)) or discharge is exceeded. The curves methodology are usually based on daily records and are useful in estimating how many days per year and event will be exceeded. The technique was further applied to estimated TC/FC loading to the Geumho River, using the daily mean flow rate and TC/FC concentration data during January, 2001 and December, 2011 for the Geumhogang6 (=Seongseo water level station) where an automated monitoring station is located in Gangchang-bridge. Low flow of the Seongseo (=11.1 cms) was equivalent to 75.3% on an exceedance probability scale. Load Duration curve for TC/FC loading at the Seongseo was constructed. Standard load duration curve was constructed with the water quality criteria for class III (TC/FC concentration=5000/1000 CFU/ 100 mL). By plotting TC/FC observed load duration curve with standard load duration curve, it could be revealed that water quality do not meet the desired water quality for 68.8/11.2% on an exceedance probability scale. IF linear correlation between flow rate and coliform concentration is assumed, it can be interpreted that water quality exceed desired criteria when daily average flow rate is over 11.9/109.9 cms. |