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Report: Koksilah Regulatory Response to Low Flows Effectiveness Analysis

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This report assesses the effectiveness of a Section 88 temporary protection order under the Water Sustainability Act on return flows to the Koksilah River in August 2019.

Author:  Northwest Hydraulic Consultants Ltd.

Date Published:  May 2020

Report ID:  58654

Audience:  Government and Public

The Koksilah River is located on Vancouver Island south of the City of Duncan. The river connects in the tidal reach of the south arm of the Cowichan River before it drains into Cowichan Bay. The Koksilah River runs through agricultural lands where many users extract surface and groundwater for irrigation and/or domestic purposes. In recent years, low flows on the Koksilah River have degraded aquatic habitat conditions and threatened fish populations. FLNRORD imposed a water extraction curtailment on specified licensed surface water and groundwater users, as well as unlicensed groundwater users in August 2019 in an effort to temporarily improve flows in the river. This study uses available data sets, including measured low flows on the Koksilah River, to assess the effectiveness of the 2019 extraction curtailment.

Report Type
  Region - Vancouver Island
  Watershed Groups - 920 - Vancouver Island (East) Rivers
  Water Information - Groundwater
  Water Information - Hydrometric / Hydrology
  Water Information - Water Management

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