STORMDRAIN Laid to Gradient
|
Gradient
|
SD250
|
SD350
|
SD400
|
SD500
|
|
1/50
|
12240 m2
|
28800 m2
|
59760 m2
|
111960 m2
|
|
1/100
|
8640 m2
|
20160 m2
|
43200 m2
|
79200 m2
|
|
1/200
|
6120 m2
|
14400 m2
|
30240 m2
|
54000 m2
|
|
1/300
|
5040 m2
|
11520 m2
|
24480 m2
|
43200 m2
|
|
1/400
|
4320 m2
|
10080 m2
|
20880 m2
|
40320 m2
|
|
1/500
|
3960 m2
|
9360 m2
|
19080 m2
|
36000 m2
|
|
1/1000
|
2736 m2
|
6480 m2
|
13320 m2
|
24480 m2
|
These charts have been designed using a rainfall intensity of 50 mm / hour.
STORMDRAIN Laid Level
|
Channel Run
|
SD250
|
SD350
|
SD400
|
SD500
|
|
30 lin metre
|
3024 m2
|
7848 m2
|
19008 m2
|
42264 m2
|
|
50 lin metre
|
2520 m2
|
6552 m2
|
16416 m2
|
37008 m2
|
|
100 lin metre
|
1872 m2
|
5040 m2
|
12960 m2
|
29880 m2
|
|
125 lin metre
|
1728 m2
|
4680 m2
|
12024 m2
|
27864 m2
|
|
150 lin metre
|
1656 m2
|
4464 m2
|
11160 m2
|
26064 m2
|
|
175 lin metre
|
1512 m2
|
4104 m2
|
10584 m2
|
24624 m2
|
|
200 lin metre
|
1440 m2
|
3888 m2
|
10008 m2
|
23400 m2
|
| As a function of its size STORMDRAIN can be laid level. To use the above table the downstream outlet must have a free discharge. | ||||
STORMDRAIN Laid to Gradient
|
Gradient
|
SD250
|
SD350
|
SD400
|
SD500
|
|
1/50
|
170 l/sec
|
400 l/sec
|
830 l/sec
|
1555 l/sec
|
|
1/100
|
120 l/sec
|
280 l/sec
|
600 l/sec
|
1100 l/sec
|
|
1/200
|
85 l/sec
|
200 l/sec
|
420 l/sec
|
750 l/sec
|
|
1/300
|
70 l/sec
|
160 l/sec
|
340 l/sec
|
600 l/sec
|
|
1/400
|
60 l/sec
|
140 l/sec
|
290 l/sec
|
560 l/sec
|
|
1/500
|
55 l/sec
|
130 l/sec
|
265 l/sec
|
500 l/sec
|
|
1/1000
|
38 l/sec
|
90 l/sec
|
185 l/sec
|
340 l/sec
|
| To calculate channel size required at the downstream outlet: Multiply the maximum drained area (A) by the rainfall intensity (I) and divide by the number of seconds in an hour (3600).Therefore A*I/3600 =V. V= velocity in litres/sec | ||||
STORMDRAIN Laid Level
|
Channel Run
|
SD250
|
SD350
|
SD400
|
SD500
|
|
30 lin metre
|
42 l/sec
|
109 l/sec
|
264 l/sec
|
587 l/sec
|
|
50 lin metre
|
35 l/sec
|
91 l/sec
|
228 l/sec
|
514 l/sec
|
|
100 lin metre
|
26 l/sec
|
70 l/sec
|
180 l/sec
|
415 l/sec
|
|
125 lin metre
|
24 l/sec
|
65 l/sec
|
167 l/sec
|
387 l/sec
|
|
150 lin metre
|
23 l/sec
|
62 l/sec
|
155 l/sec
|
362 l/sec
|
|
175 lin metre
|
21 l/sec
|
57 l/sec
|
147 l/sec
|
342 l/sec
|
|
200 lin metre
|
20 l/sec
|
54 l/sec
|
139 l/sec
|
325 l/sec
|
| As a function of its size STORMDRAIN can be laid level. To use the above table the downstream outlet must have a free discharge. | ||||
