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Esquimalt Lagoon

State of the Ecosystem Report

Kayacks

Water Quality Analysis Project 1998

Waterose et. al.


Fish

Section 2. History and Land Use:


Background of Esquimalt Lagoon:

Esquimalt Lagoon is located just east of Esquimalt Harbor near the southern tip of Vancouver Island. RRU occupies the largest single land base adjacent to the Lagoon. The topography of this land is characterized by rocky slopes to the north, and gravel slopes to the south end of the Lagoon. The soils are composed of permeable glacial tills, sand and gravel (Colwood, 1997). The Environmental Mission Statement of RRU reflects the desire to manage the campus in an environmentally responsible manner (Watchell and Thompson, 1997). The concerns regarding Esquimalt Lagoon pertain to the recreational use of the Lagoon. The present and potential anthropogenic uses of the Lagoon include swimming, boating, fishing, and site seeing. As an estuary, it provides an important habitat for a diverse community of marine and terrestrial flora and fauna.

There are several factors which affect the recreational values and the intrinsic habitat values. The most immediate human health concern is a high concentration of fecal coliforms. Fecal coliform analysis of Lagoon water samples, provided by John MacRae & Associates Inc. in August of 1997, indicated levels as high as 25200CFU/100ml (CFU = Coliform Forming Units) (MacRae et.al., 1997). The maximum acceptable concentration for areas of �primary contact�, swimming, is 100CFU/100ml, and for �secondary contact�, boating, is 200CFU/100ml. In addition to monitoring fecal coliforms, certain nutrients such as nitrates are also monitored to analyze the general health of water bodies. Some of the freshwater inputs into the Lagoon have been determined to have concentrations of nitrates which exceed the maximum acceptable levels (Canadian Council of Ministers of Environment (CCME) freshwater guidelines). Although the cause of this phenomenon is not completely understood, there is a potential correlation between the coliform levels and the nutrient levels. Another phenomenon related to high levels of nutrients was an algae bloom in 1990, which caused a major fish kill (Colwood, 1993). A similar fish and crab kill that occurred in August 1997, was suspected to have been caused by anoxic water rapidly brought from the bottom layers of the Lagoon to the surface by a �rollover� event (Young, 1997).

There are several approaches that can be taken in assessing the problems associated with the water quality in Esquimalt Lagoon. Some examples include a complete nutrient budget, a sediment analysis, a benthic invertebrate study, a study of red tide bloom triggers, an analysis of total/fecal coliform inputs, and a survey of the hydrology and landforms surrounding the Lagoon.

The approach that was adopted for this study was to develop a strategic sampling plan to encapsulate the analysis of surface water that originates above ground both on and off the RRU property and to draw comparisons. In addition, the chemical analysis approach that was adopted was to develop testing techniques that could be completed in-house within a reasonable amount of time and cost. The objective was to obtain a broad overview of the levels of nutrients and fecal coliforms in the RRU water systems. With this information, potential areas of concern were identified for analysis in further detail at a later time.


Historical Land Use:

Historical Land Use Summary:

The chronological history of the land use is summarized below. This background information provides valuable insight into the historical significance of RRU and identifies the record of land uses.


Some Colourful Details about the Historical Characters:

Reference Source: Hatley Park an Illustrated Anthology by Geoffrey Castle, 1995.

Land Use Today:

Colwood

City of Colwood:

The study examined areas both within and outside the RRU property in order to draw comparisons. Of particular interest is the origin and source of Colwood Creek. Glen Lake is the source of Colwood Creek and runs through the Royal Colwood Golf Club and the grounds of the university into the Lagoon. Glen lake and the ponds in the Golf Course are used heavily by waterfowl, and are surrounded by residential neighborhoods. Colwood City surrounds the grounds and inputs from Colwood may be draining through the RRU property through the water table. Until recently, all residences in the Colwood area used individual septic systems. In addition, there is a sewage outfall used by RRU that extends 400 meters south of the Lagoon out into the ocean.

The Colwood area drainage basin, which flows into the Esquimalt Lagoon is illustrated in Figure 2.1 below.

Basin
Figure 2.1 Colwood Drainage Basin
Map Reference Source (City of Colwood, 1997).


The Royal Colwood Golf and Country Club:

The information regarding the upstream land use has been compiled from previous reports and interviews with the staff of the Royal Colwood Golf and Country Club.

The land area totals 150 acres including 100 acres of turf and 50 acres of woodland. This includes 18 play holes, one lake and two ponds. Glen Lake is the source of the surface drainage water which flows through the golf course and into the Esquimalt Lagoon via Colwood Creek. The golf course land was used as a gravel pit and was later topped with sand. Sand is a porous material, and the golf greens drain naturally through the porous soil. There are natural springs on the grounds. At the second tee the flow rate is 600 gallons per minute. The thirteenth and fourteenth hole have natural drainage (Singlehurst, 1998).

The irrigation system uses water from Colwood Creek. The peak irrigation time is during the summer when they use 4,030-500,000 gallons on per night, depending on precipitation levels, to irrigate the golf course. They experienced an algae bloom at the thirteenth hole in 1996. They obtain soil reports bi-annually. The fairways and greens are predominately black loam soils. The greens are trimmed daily in the summer months, and weekly in the winter months.

The grounds are fertilized by a hopper system with a capacity of twelve to fifty pound bags. They use slow release fertilizers, usually nitrogen and phosphorous, on a one to one ratio. Fertilizers are applied to the greens between March and October, and to the fairways three or four times per year.


To Section 3. Geomorphology


Index:

  1. Introduction
  2. History and Land Use
  3. Geomorphology
  4. Nutrients and Coliforms
  5. Red Tides and Fish Kill
  6. Hydrocarbons
  7. Sample Procedure
  8. Analysis Procedure
  9. Results
  10. Discussion
  11. Future Study
  12. References
  13. Photo Album


Fish


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Mailemail Waterose


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