81
TABLE 2.
VELOCITIES DUE TO DIFFERENT TIDAL RANGES WHEN EBB TIDES
ARE AT OR ABOVE 1.25 O.D.
TIDAL RANGE.
7.00 feet
6.50
6.00
5.50
39
5.00
4.50
**
4.00
,
3.50 3.00
J
27
VELOCITY.
3.5 feet per sec.
3.5
"
3.2
15
3.1
17
2.9
17
2.8
>>
2.6
2.4
11
2.3
CAPACITY OF NULLAH AT DIFFERENT HEIGHTS OF TIDE (ON THE ASSUMPTION
THAT THE WATER IS DRAINED DOWN TO 3.50 O.D.)
HEIGHT OF TIDE.
7.50 0.D.
7.00
+9
6.50
22
6.00
5.50
5.00
4.50
4.00
CAPACITY OF NULLAI.
36,120 cubic feet.
29,730
23,890
77
18,560
13,785
9,530
5,820
11
2,640
TIME TAKEN TO DISCHARGE LARGE (SOUTHERN) SEWER AND STORAGE
TANK, AT DIFFERENT VELOCITIES AND HEIGHTS OF TIDE.
VELOCITY.
HEIGHT OF TIDE.
TIME TO DISCHARGE
3.3 feet per sec.
7.0 0.D.
6.0
SEWER AND TANK.
65 mins.
59
"
5.0
52
>
"
4.0
47
3.1
7.0
71
י:
6.0
63
3.0
56
4.0
52
2.8
7.0
79
6.0
70
>>
5.0
ور
4.0
2.4
7.0
63
57
90
>
"
6.0
80
"
5.0
71
1
4.0
65
+
Annexe 10.
Hon. DIRECTOR OF PUBLIC WORKS,
Further to my minute of 1st June, 1921, I have now been able to go more deeply into the details of the scheme of drainage which I propose for the Western portion of Kowloon Peninsula and find that with further refinements in syphonage and anti- syphonage which will not affect the cost of the scheme, a very high efficiency can be obtained.
No comments yet.
Private notes are available after approval.