Oct. 4, 1915-Mar. 27, 1916 Illustrations XXV 
Flow through Weir Notches with Thin Edges and Full Contrac¬ 
tions 
Page 
Fig. i . Plan and sectional elevations of the Fort Collins hydraulic laboratory.. 1054 
2. Device used in referring elevations of the notch crest to the reading of 
the hook gauge. 1056 
3. Ladder, platform, and datum rod used in calibration tanks. 1058 
4. Curves showing the relation between discharges with constant heads 
through rectangular notches of different lengths and the lengths of 
the notches. 1062 
5. Curve showing the relation between a in the equation Q=aL—b and the 
heads on rectangular notches—. 1063 
6. Curve showing the relation between b in the equation Q~aL~b and the 
heads on rectangular notches. 1064 
7. Curves showing discharges through rectangular notches of different . 
lengths. 1068 
8. Curve showing relation of coefficients (C) to lengths of rectangular 
notches. 1071 
9. Curve showing relation of n to length of rectangular notches. 1072 
10. Curves showing discharges through Cipolletti weir notches of different 
lengths. 1078 
11. Curve showing discharges through 2-foot rectangular and Cipolletti 
notches and 2-foot notches having 1 to 3 and 1 to 6 side slopes. 1082 
12. Logarithmic diagram of discharges through 28° 4', 30°, 6o°, 90°, and 
120 0 triangular notches. 1084 
13. Curves showing discharges through circular weir notches. 1089 
14. Curves showing effect of different end and bottom contractions upon 
discharges through i-foot and 3-foot rectangular notches with heads of 
0.6 and 1 foot. 1092 
15. Curves showing the effect of different end and bottom contractions 
upon the discharges through i-foot and 3-foot Cipolletti weir notches 
with heads of 0.6 and 1 foot. 1093 
16. Curves showing the effect of different ratios of cross-sectional area of 
the weir box (A) to the area of the notch (a) upon discharges through 
a i-foot rectangular notch with heads of 0.6 and 1 foot. 1096 
17. Curves showing the side slopes required with different heads in order 
that the discharge through a 2-foot notch will be twice the discharge 
through a i-foot notch. 1100 
18. Curves showing the discharges through a i-foot rectangular notch sub¬ 
merged to different depths. 1103 
19. Curves showing the discharges through a 2-foot rectangular notch sub¬ 
merged to different depths. 1104 
20. Curves showing the discharges through a 3-foot rectangular notch 
submerged to different depths... 1104 
21. Graph showing the discharges through a 4-foot rectangular notch 
submerged to different depths. 1105 
22. Curves showing the discharges through a i-foot Cipolletti notch sub¬ 
merged to different depths.. 1106 
23. Curves showmg the discharges through a 2-foot Cipolletti notch sub¬ 
merged to different depths. 1107 
24. Curves showing the discharges through a 3-foot Cipolletti notch sub¬ 
merged to different depths. 1108 
25. Curves showing the discharges through a 4-foot Cipolletti notch sub¬ 
merged to different depths. 1109 
