total (approximate) 2400ft water line with total (approximate) 400ft elevation change

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djterm

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Hi everyone. This is a real situation with an unimproved parcel of land that I currently have under contract and within the due-diligence period. I believe this is a difficult question. What I am trying to do is determine what it would take to supply the yet-to-be-built 3 bedroom/2 bath home (no additional irrigation or other water uses outside of the home) with adequate water supply. Provided below is all of the pertinent information that is known at this time. Aside note - drilling a well is not entirely feasible. Any and all timely assistance is very much needed and very much appreciated. Thank you all in advance.

** all distances and elevations are in feet(ft) **
** water main pressure is between 115 and 135psi **
** water meter is expected to be a 1" tap 5/8ths 20gpm meter ***
** water line is expected to be 1.5" HDPE **

Following is the segmented distances with associated elevation changes (post-hyphen) which traverse from ORIGIN to DESTINATION (planned home-site) and derived from the GIS (presumed to be accurate):

0 ORIGIN - water main/water meter location - 1210
1 500 to bend in road - 1210 to 1280
2 750 to bend in road (will traverse a couple of very minor bends) - 1280 to 1420
3 275 to bend in road (will traverse one very minor bend) - 1420 to 1460
4 300 to bend in road at edge of property (will traverse one minor bend) - 1460 to 1500(1510)

For 0-4 above:

Elevation change: 1210 to 1500(1510) = 290(300)
Water line distance: 1825

Since current stage is pre-site-development it is very difficult to state with certainty the ultimate route for water line within the property boundaries. Following are two plausible routes which would emanate from number 4 above:

5 50 to potential pump/housing location - 1500(1510): then 400 to DESTINATION (will traverse a couple of to-be-determined bends) - 1500(1510) to 1620
6 25 to potential pump/housing location - 1500(1510): then 175 (will traverse a couple of minor bends) - 1500(1510) to 1600: then 250 to DESTINATION (will traverse a couple of to-be-determined bends) - 1600 to
1620

For 5 or 6 above:

Elevation change: 1500(1510) to 1620 = 110(120)
Water line distance: 450

For 0-6:

TOTAL elevation change: 1210 to 1620 = 410
TOTAL water line distance: 2275

Since I am unaware of the absolute accuracy of the GIS, if it is at all possible it may be prudent to take the above TOTAL elevation change and TOTAL water line distance and multiply both values by 5% (worst-case) and 10% (not probable worst-worst-case) per below as design/capacity margin as if the system would be required to function at these percentages. For what it is worth I highly doubt that the GIS would be in error by more than a percent or two - however I do not know this for certain.

5% margin: Total elevation change: 430.5
5% margin: Total water line distance: 2388.75

10% margin: Total elevation change: 451
10% margin: Total water line distance: 2502.5
 

Valveman

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Just considering elevation of 430’ or 450’ you will need a booster pump at the meter that can take the 115 to 135 PSI and add another 80 PSI for a total of about 200 PSI. Then you will need a cistern type storage tank at the house to fill using a float switch. Another booster pump from the cistern can do the standard 40/60 pressure to the house.
 
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