utilities

Sizing Chart

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.

 

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