YANG Zhan-qiang,LIU Jie,DING Wen-chuan,et al.Verification of Rural Non-point Source Runoff Interception Rate in East Bank of Dianchi Lake Basin Interception System[J].China Water & Wastewater,2021,37(11 11):104-110.
Verification of Rural Non-point Source Runoff Interception Rate in East Bank of Dianchi Lake Basin Interception System
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
11 11
Page:
104-110
Column:
Date of publication:
2021-06-01
- Keywords:
- rural non-point source runoff; interception rate; east bank of Dianchi Lake Basin; settling and intercepting well; design goal
- Abstract:
- Rural non-point source pollution is one of the main contamination sources in Dianchi Lake, and wastewater interception systems around the lake play an important role in intercepting rural non-point source runoff. At present, the whole wastewater interception system,especially the east bank part,has been basically completed. Based on actual operation performance, this paper verified whether the interception function of the east bank rural non-point source runoff interception system being reached the design goal, so as to provide a scientific basis for water environment management of Dianchi Lake Basin. On the basis of previous theoretical demonstration, actual water quantity data at settling and intercepting wells in the east bank system were obtained through on-site monitoring, and the interception rates of rural non-point source runoff under the condition of single rainfall and typical rainfall year were discussed deeply. The rural nonpoint source runoff interception rates were 36.98% and 70.62% in two rainfall events with rainfall of 43.2 mm and 25.9 mm, respectively. During 1995 to 2009, the minimum and maximum annual interception rates of rural non-point source runoff were 42.33% (1998) and 69.42% (2000). The average annual interception rates of rural non-point source runoff in dry years, normal years and partial wet years were 61.56%, 51.55% and 52.31%, respectively. In conclusion, the design of settling and intercepting wells in Dianchi Lake wastewater interception system could effectively achieve the goal of intercepting 30% of rural non-point source runoff, which was of great significance to evaluate the performance of the interception systems around the lake.
Last Update:
2021-06-01