No. 1011.
RIVER SLOPE ON OTTAWA AND ST. LAWRENCE RIVERS.
TO ESTIMATE THE SLOPE THROUGH RIGOLET HARBOUR.
Narrows :—lM wide, 4M long. Centre depth, 24 to 30 fathoms.
|
High Stage (Elevation). |
Low Stage (Elevation). |
Total Fall. (Mean). |
Distance in Miles. |
Actual Slope per Mile. |
| OTTAWA RIVER. |
Feet. |
Feet. |
Feet. |
Miles. |
Feet. |
| Ottawa harbour to |
152.00 |
127.00 |
|
|
|
| Granville Canal : Lock No. 1 |
145.22 |
126.18 |
|
|
|
| Difference |
6.78 |
0.82 |
3.80 |
59M |
.06 |
| Carillon to |
|
83.28 |
68.28 |
|
|
| Ste. Annes. |
81.07 |
68.27 |
|
|
|
| Difference |
2.21 |
0.01 |
1.11 |
15M |
.07 |
| ST. LAWRENCE RIVER. |
|
|
|
|
|
| Longueil to |
|
34.48 |
19.04 |
|
|
| Sorel |
27.94 |
12.72 |
|
|
|
| Difference |
6.54 |
6.32 |
6.43 |
41½M |
15 |
| Rigolet Narrows :—Assuming the slope to be half the amount of the St. Lawrence River, or the whole of the amount of the Ottawa, because of the very much greater depth, the total fall from Lake Melville to the open, through the narrow passages and the Narrows proper (distance 8 miles, would be |
Total Fall. |
|
|
|
|
|
Feet. 0.50 |
| (per mile—0.07 + 8M = 0.56 ft.) |
[1927lab]
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