Talk:Salmon Creek Dam

something wrong with these figures

"Bank to bank, the crest length is 195.2 meters (640 ft). The dam envisaged storage of about 18,000 acre ft at the Full Reservoir level while it is 445 acre ft at 25 ft depth of water, and the reservoir extended to a length of 195.2 miles (314.1 km). "

The reservoir is not 195.2 miles long. This figure might be mistaken from the crest length of the dam, 195.2 meters.Eregli bob (talk) 21:01, 27 July 2010 (UTC)

The reservoir is 1 mile long. 195.2 miles was an inadvdertant error. It is corrected now. -- N.V.V. Char ^Talk . 15:30, 29 July 2010 (UTC)

Unusual unit - 'tonnes/ft'

The text says:

• "An ice pressure of 10 tonnes/ft length of the dam was considered based on the rim conditions of the reservoir and the design was also checked for an ice load 20 tonnes/ft;"

Can anyone give a reference for 'tonne/ft'. It doesn't seem right. Lightmouse (talk) 10:56, 29 July 2010 (UTC)

• I think it may mean tonnes per foot as in pressure but the structure and grammar in the sentence is confusing.--NortyNort (Holla) 11:39, 29 July 2010 (UTC)

Pressure is force per unit area. The denominator 'foot' is length, not area. Furthermore, tonne=1000 kg and it is unusual to see kg/ft which makes me think it's an error and really means one of the variants of 'ton' more common in America. Lightmouse (talk) 12:34, 29 July 2010 (UTC)

The reference no 3 gives the following text. "When the water in the reservoir level with the bottom of the spillway, an ice pressure of 10 tons per running foot was provided for. This was considered adequate as the rim slope of the reservoir sides at higher levels near the dam is not sufficient to confine the ice under heavier pressure. It was also established that even with an ice pressure of 20 tons/ft the resulting compression on the concrete would be provided for with a sfatey factor of 5." The terminology tons/running feet implies an area of 1 sqft of the dam. -- N.V.V. Char ^Talk . 15:48, 29 July 2010 (UTC)

Aha. So it is a US short ton of 907 kg, not a tonne of 1000 kg. If 'running foot' = square foot, then that clears it up as pressure. It's apparently 10 tons force per square foot (500 kPa) and 20 tons force per square foot (1000 kPa). I think the text could be improved to that effect. Lightmouse (talk) 16:02, 29 July 2010 (UTC)

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