In-Stream physical heterogeneity, rainfall aided flushing, and discharge on stream water quality

Pattiyage I.A. Gomes, Wing Hong Onyx Wai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

5 Citations (Scopus)


Implications of instream physical heterogeneity, rainfallaided flushing, and stream discharge on water quality control have been investigated in a headwater stream of a climatic region that has contrasting dry and wet seasons. Dry (low flow) season's physical heterogeneity showed a positive correlation with good water quality. However, in the wet season, physical heterogeneity showed minor or no significance on water quality variations. Furthermore, physical heterogeneity appeared to be more complementary with good water quality subsequent to rainfall events. In many cases stream discharge was a reason for poor water quality. For the dry season, graywater inputs to the stream could be held responsible. In the wet season, it was probably the result of catchment level disturbances (e.g., regulation of ephemeral freshwater paths). Overall, this study revealed the importance of catchment-based approaches on water quality improvement in tandem with in-stream approaches framed on a temporal scale.
Original languageEnglish
Pages (from-to)758-768
Number of pages11
JournalWater Environment Research
Issue number8
Publication statusPublished - 1 Aug 2015


  • Ephemeral streams
  • Physical heterogeneity
  • Stream discharge
  • Water quality

ASJC Scopus subject areas

  • Environmental Chemistry
  • Water Science and Technology

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