28 BULLETIN 1077, U. S. DEPARTMENT OF AGRICULTURE. 
edges of the concrete pavement, back filling the trench to the level 
of the bottom of the pavement with stone or gravel. Whether the 
tile should be used under both edges of the pavement will depend 
TYPICAL SECTION OF 9 FT CONCRETE R0A0 
TVFICAL SECTION 0FI8FT COhCRETE 
V.1THF1.AT SuSuBABE: 
TYPICAL SECTION OF 18 FT CONCRETE ROAD 
WITH CSOWNES 5UB6BA0E 
'c 'SHOULD SC FROM li TO Z ' 
y g rods 3-6 /o.»g. ^■6c/oc 
SECTION WITH CURflS 
8 Concrete 
rods 3-6 /ong 2-S 'c t 
SECTION WITH ONE CURB 
FOR SlOC MILL CUTS 
v J rods 3-6 /ong, e-6 cfoc 
SECTION WITH 6UTTERS 
USI CITNCR STYLE OT OUTrtR ACCORCU6 TO CONOmONS 
c 'should bc mow i£ to a 
Fig. 7. — Typical pavement cross-sections. 
upon the location of the pavement. On sidehill work one line of 
tile under the edge of the pavement nearest the hill will often suffice, 
but through cuts it will probably be necessary to use the tile on 
