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RE: dam-l Canadian Dams and Reservoirs (fwd)

Tim,

Here are a few thoughts.  As I think about it I wonder whether the kind of
thing you are looking for even exists.  Many reservoirs were created prior
to GIS, and therefore what may have been forested area is now classified as
water in GIS.  

1) You might try individual hydro companies.  This might capture most of the
major reservoirs if you started with BC Hydro, Ontario Hydro and Hydro
Quebec.  I'm not sure whether all would be amenable to providing that
information, or whether they have it, but that's where I'd try first.  

You did mention that you wanted it in GIS format, but is that essential.
Some work we did on Arrow Lakes Reservoir used curves relating water surface
elevation to reservoir area.  Knowing the original lake elevation and the
maximum elevation one could then find flooded area.  In other cases where a
river valley was turned into a reservoir you could subtract an estimate of
pre-impact wetted area from the maximum pool surface area to derive flooded
area.  These curves (hypsographic curves I think) may be more available for
some reservoirs.

2) For some larger systems Canadian Hydrographic Service has produced charts
(e.g. in BC Kootenay Lake, Arrow Lakes Reservoir, and I believe also
Williston Reservoir).  However I think their is a higher price for
electronic maps. 

Hope this helps.  Contact me directly if I can help with any information
concerning BC.

Steve McAdam


************************************************
Steven McAdam, M.Sc.
Senior Hydroelectric Impacts Biologist
Ministry of Fisheries
780 Blanshard Ave.
Victoria, B.C., Canada
tel: (250) 356-7217 fax: (250) 387-9750
e-mail: steve.mcadam@gems7.gov.bc.ca
*************************************************


-----Original Message-----
From: Dianne Murray [mailto:dianne@sandelman.ottawa.on.ca]
Sent: Tuesday, June 29, 1999 8:48 PM
To: dam-l@sandelman.ottawa.on.ca
Subject: dam-l Canadian Dams and Reservoirs (fwd)


Forwarded message:
From twilson@imag.net  Tue Jun 29 22:10:19 1999
Message-ID: <01f601bec29c$73000360$659ec8cf@imag.net>
Reply-To: "Tim Wilson" <twilson@imag.net>
From: "Tim Wilson" <twilson@imag.net>
To: <dianne@sandelman.ocunix.on.ca>
Subject: Canadian Dams and Reservoirs
Date: Tue, 29 Jun 1999 18:33:22 -0700
Organization: BC Wild
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Hi There,

The search engines of the Net have brought me to your site.  I am
researching the location of existing dams and their flood footprints
(reservoirs, submerged forest, etc.) in GIS format for Canada.  It is quite
hard to discover information within the Cdn federal government - any leads?
We are trying to map the impacts of dams on Cdn forests.

Thanks,

Tim Wilson
Manager, Information Systems
Global Forest Watch Canada
Mapping and Technical Services Office
Suite 302 - 319 West Pender St.
Vancouver, BC
V6B 1T3

tel: 604.669.4802, x19
fax: 604.669.6833