Small residential water system 2

[beameupscotty]

Anyone know of good sources or guide for designing a domestic water system to serve 30 lots from well and storage tank/reservoir?

I'm in the preliminary stage now (calculating demand for fire and max hourly use). I believe the requirement for fire is 1000 gpm/dwelling (under 3600 sf). I found a source that the State of Washington Department of Health uses here:

http://www.doh.wa.gov/ehp/dw/publications/design.htm

I'm mostly interested in something to help with the calculations now. The site has existing water rights and I'm aware that a water district will have to be formed to administer and maintain the system.

 

[cvg]

for fire flow you need to get this number from the fire marshal or the City / county will provide it to you. Don't make an assumption as this can be critical to sizing a small system.

 

[Surcharged]

I recommend a software program to size the water mains. WE use watercad by Haestad and are happy with it. If it is a non-looped branch line you can use the hazen williams formula and do it by hand. You may could do a single loop without too much trouble. anything more complicated and you need a computer.

 

[bimr]

Check with the building code officials as well. Some residential building codes are now requiring sprinklers in houses.

 

[cvg]

download epanet free to do the hydraulic analysis

http://www.epa.gov/nrmrl/wswrd/dw/epanet.html

 

[civilperson]

Hydrants require 3000 gpm for 30 minutes to be classified as protected for insurance ratings.