Water Supply Problems in Alaska— Alter 



231 



Arctic well house weatherproofing details. Condensation causes 

 icing on walls, on nail heads and in insulation. In some parts 

 of the low temperature regions, temperature differences be- 

 tween heated interiors and the ouside air may be as much as 

 130 to i40°F. Air Temperature and Frost Penetration Data at 

 Alaska Stations which are shown in Table 2 present a general 

 summary of considerations pertinent to design of water supply 

 facilities. 



i« X 5 



90# RooriN* 

 |« x 6" T * G-^ \ 



MM^ 



B la nket 



I" x 6" T 4 6 



2" Insulation 

 Blanket 



i" X 8" Bevel SIDINS 

 I" x 8" Shiplap 

 i?# W.P. Bloq Paper 



T.*G. IN OPPOSITE 

 D INECTIONS 



^- 90 J Roof 1 no 

 ~ 15* w.P. 



BL04.PAPE" 



ARCTIC WELL HOUSE WEATHERPROOFING DETAIL 



Fig. 4. 



Low temperatures and permafrost affect the construction and 

 maintenance of wells and well appurtenances. Drilling wells 

 through permafrost necessitates continuous work in order to 

 prevent freezing of casing and equipment. After development 

 of the well, continuous and moderate pumping is necessary to 

 prevent freezing of water in the casing or possibly freezing of 

 the aquifer. Well casings should be anchored securely in perma- 

 frost and constructed so that seasonal freezing of the surround- 

 ing soil does not disjoint, crush, or otherwise damage the casing. 

 It is difficult to provide proper protection of a well from sur- 

 face drainage around the casing and yet provide cohesionless 

 material around the casing so that the effect of seasonal frost 



