Rainwater Tanks 

 

Fiberglass rainwater tanks are corrosion free, reliable & a watertight solution used to store rainwater

for landscaping, irrigation, potable water & non-potable water uses.  A rainwater collection system

can collect up to 0.62 gallons of water per square foot of roof space,  per inch of rainfall. With 

factors such as evaporation, splash out, leaks, overflow from gutters, and first flush, we use a

collection efficiency percentage of 75-85%.

 

Example

(0.62 x .85 x 1500 x 36) 

 

   

Seattle WA. Annual Rainfall 36 Inches                                                           
Sqaure Feet of Roof Area 1500
Rainwater Collection Efficiency 85%
Gallons of Water Per Square Foot/ Per Inch  0.62
Total Annual Rainwater Collected 28,458

  

  

 

Tank Shell Drawings

 

 

 

 

 

 



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