North Shore Erosion Control

(click on any image to enlarge)

 

Pathway threatened by erosion ...

Pathway threatened by erosion …

 

There is no question that erosion on the north shore needs to be stopped, in some places the bank has been eroded back 4 – 5 meters, and the walkway itself is threatened.  There are two competing visions as to how this erosion will be checked: armour stone or bio-engineering.

 

 

 

 

 

 

Manicured lawn right to the edge of the water provides no protection against erosion ...

Manicured lawn right to the edge of the water provides no protection against erosion …

 

The armour stone solution recommends the placing of heavy large stone or concrete blocks  along the shoreline from the Festival Bridge to the Orr Dam.  The advantage of this approach is that it is very permanent and will stop erosion — witness the stone wall protecting Tom Paterson Island.

 

 

 

 

 

Brad Glasman of UTRCA carrying a Coir log ...

Brad Glasman of UTRCA carrying a Coir log …

 

Unfortunately, there are three major disadvantages: First, it is very expensive.  According to the retained consultant’s presentation to subcommittee on August 2006, it would cost almost two million dollars to supply and install armour stone from Festival Bridge to the Orr Dam.  Second, armour stone or concrete present a sterile appearance and provide no habitat for wildlife as compared to natural vegetation.  Third, and most important, stone and concrete do not filter or clean the water, whereas natural vegetation does filter out pollutants.

 

 

Bulrushes protect the shoreline in front of a heritage home and have been established since 1993 ...

Bulrushes protect the shoreline in front of a heritage home and have been established since 1993 …

 

AREA strongly advocates the bio-engineering solution and recommends the following:

  • An uncut buffer zone between the cut lawn and the top of the bank to slow runoff and absorb pollutants.

 

 

 

 

 

A close-up view of bulrushes on the North Shore ...

A close-up view of bulrushes on the North Shore …

 

  • The establishment of shrubs on the shoreline.
  • The construction of an underwater dirt bench protected by green gabions or large rip-rap which would reclaim some of the land lost to erosion.
  • The planting of aquatic vegetation, protected by coir logs, in the dirt bench.
  • In this way erosion is controlled, the water  is cleaned and wildlife finds a habitat. The best and the cheapest solution!

 

 

 

 

 

 

LAKE VICTORIA NORTH SHORE LINE EROSION CONTROL & FISHING ACCESS

Foundation for Fishing Crib

Construction of the Foundation of a Fishing Crib


L. Victoria Fishing Access under construction Feb 2015

Fishing Crib Access under construction Feb 2015


Fishing Access - Shoreline Erosion Control Project  @ March 21, 2015

————————Fishing Access – Shoreline Erosion Control Project at March 2015


L. Victoria rec April 11, 2015

Project Completion April 2015


A cross section of an option for an underwater bio-engineered bench ...

A cross section of an option for an underwater bio-engineered bench …

 

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