Design of gutters and pipes for vertical discharge in roof stormwater drainage   
       
The app returns the gutter dimension and the no. of vertical discharge pipes for draining a fixed flow-rate from a surface  
                 
Roof width Lc (m)
       
Roof length Hc (m)        
Roof slope ic (°)        
Projection roof surface S (m2)        
Rainfall intensity j (mm/h)        
Surface type            
Coefficiente Efflusso ϕ (  )        
Rainfall Flow-rate Q (l/sec)        
                 
 Channel choice                
Channel type BxH (cmxcm)    
Width B (mm)    
Height H (mm)    
 Suggested slope i (%)    
Filling rate h/H% (%)    
 Ks   m1/3 s-1          
Channel flow rate Qg l/sec)          
Since            
Vertical pipe choice                
 Pipe DN DN l/sec)          
Pipe flow-rate Qd (mm)          
Number of pipes Nd (mm)          
Distance between pipes Ld (m)