Difference between revisions of "Flow Rate (Q)"
(Created page with "*The rate of flow of rainwater to be drained away from a roof under steady state conditions shall be calculated from equation 1: <math>Q = r*A*C</math> where; <math>Q</math>...") |
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<math>Q = r*A*C</math> | <math>Q = r*A*C</math> | ||
| − | where; | + | where;<br clear> |
<math>Q</math> is the rate of flow of water, in litres per second (l/s);<br clear> | <math>Q</math> is the rate of flow of water, in litres per second (l/s);<br clear> | ||
<math>r</math> is the rainfall intensity, in litres per second per squre metre <math>[l/(s*m ^2]</math>;<br clear> | <math>r</math> is the rainfall intensity, in litres per second per squre metre <math>[l/(s*m ^2]</math>;<br clear> | ||
Latest revision as of 11:21, 12 September 2017
- The rate of flow of rainwater to be drained away from a roof under steady state conditions shall be calculated from equation 1:
where;
is the rate of flow of water, in litres per second (l/s);
is the rainfall intensity, in litres per second per squre metre ![[l/(s*m ^2]](/images/math/c/3/3/c334b76601bccd849678ef7913695986.png)
;
is the effective roof area, in square metres 
;
is a runoff coefficient (taken as 1.0 unless national and local regulations and practice state otherwise), dimensionless.
Reference
- BS EN 12056-3:2000
