2l6 



ENGINEERING ON THE FARM 



of men and teams should be kept on the work as can be 

 properly directed and kept steadily at work. Arrangements 

 should be made for having all necessary implements in good 

 repair and on the road when needed. All work should be 

 done with a view to permanency and durability. The work 

 should not be done at a season when the road will be left 

 in a worse condition than if no work had been done. 



PROflLE 



GPADE 



10.0- 



fflasgsggjgsss 



-10.0'- 



.33 .4 .33 .28 .21 .00 



DEPTH .00 .21 



.28 



./Oil 



DEPTH .OC 



10.0 



10.0 



PROFILE 



_ . ...... % U.1. > ...|.-.'..J.-; I A7-.T 



-Z" 4- t + Z^Z'^z'JL 2'+2 , -^2 , +E'-+ 1 

 .17 .30 .40 Al .5|0 .47 .40 .30 .17 



^V 



00 



3 



S 



-2 



DEPTH .00 



12.0 



PROFILE 



~G~R aITE - > ^^g^S ^^^ ^S^^wife^^^^^^J^^g^^^^^^^ga^^ 



t .. ■ ' , t | ..s-. | -. | ..' L ..v-v-'- 



1Z.0 



4-2' + 2'+2 + 2 '+ 2, -T- 2 '+ 2 '+ z '+2'4- 2"4 2 'H ' 

 .17 .30 .40 .47 .50 .5|0 .50 .47 .40 .30 .t7 .00 



m \ 



12.0' 



4.5 



12.0 



4.5' 



* 7" '7| 



M/f.' 6 "Drain file with grave/- filled 

 trench 3 7o 4 deep fo be placed II from 

 <£ in all clay cuts and tvherever conditions 

 require such drainage 



D 



'>...'.}i t>"°^ .■•■^■». »■••■■» ...»■ »-.-|::y..r-.-.-..o^>y 



(|4'on FILLS SOKOVEe) 



m 



855 C.V Grave/ per mile 

 in shoulders 



Fig. 187. Standard surfacing sections of the Minnesota Highway 

 Department for secondary trunk or primary state roads 



A — Gravel surfacing requiring 800 cubic yards of gravel per mile 

 B — Gravel surfacing requiring 1200 cubic yards of gravel per mile 

 C — Gravel surfacing requiring 1600 cubic yards of gravel per mile 

 D — Nine-foot concrete roadway with gravel shoulders 



