WSP02285

• File Number: 8220.200.05.J
• Description: Hoover Dam/Lake Mead/Boulder Canyon Project
• Basin: Colorado Mainstem
• Date: 1/1/1949
• Author: USDOI/BOR
• Title: Boulder Canyon Project Final Reports: Part VI/ Bulletin 4 - Model Studies of Imperial Dam Desilting Works All-American Canal Structures
• Water Supply Pro - Doc Type: Report/Study

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CONTENTS

MODIFICATIONS IN FINAL SPILLWAY DESIGN AS RESULT OF
PRESSURE TESTS
Section pagt
24. Modifications of preliminary design. ..' ..... '......"................. .,. .... 30
25. Pressures 00 face of spillway-final design. .... ,..............'.... ......... 30
26. Effect of depth of approach on discharge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 30

CHAPTER III-SLUICEWAY STUDIES

SLUlCEW A Y TEStS

27. Model tcSU on Imperial Damsllliceways..... -.......".. ....... ... ..- 33
28. The original design. ...,'......."...... ...,.........,....'.. -.-.,...,. 33
19. The original design model. . . . . . . . . . . . . . . . . . . . . . . .. .. . . .. . .. . . .. . .. . . . . , . . . . . 35

STILLING-POOL TESTS

30. Tests of the original design pool. . ........................................... 35
31. Modifications of the original design pool....... ...................... 35
32. The double-jump pool.. . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
33. The long sloping-apron type......................... .......... 38
34. The final design......................................................'..... 40

CHAPTER IV-ALL-AMERICAN CANAL HEADGATE
STUDIES

35. The design of the All-American Canal headworks. . . . . . . . . . . , . .. . . . . . . . . . . . , . . 47
36. The 1:20 headgate model.,...... .......................... ........ .......:. 47
37. Results of tests on original design. ... ........... ....................... ...... 48
38. Experiments with boundary-layer control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
39. Sti1ling~pool design......................................................... 50
40. Revision in shape of gate pietS............................................... 52
41. Pressures on roller gate....... ......... .... ..... ..... ... ........ ..... ........ 52
42. Calibration of roller gate.... ..... '," ..... .... ... .................. .......... 56

CHAPTER V-PERCOLATION STUDIES

EJECTOR TESTS

43. History of ejector tests..,......................,............................ 59
44. The original model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .'. . . . . . . . . . . 62

45. Test procedure. ....... ............ .-. ............... ... .......... ........... 63
46. Results from the ciriginal design. ..... ............ ...... ..... ...... ....... ... 63
47. Deflectors over ejectet openings. . . . . . . . . . . . . . . . . . . . , . . . . . . . . . . . . . . . . . . . '.. . . . 66
48. Ejectors projecting from face of dam. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
49. The results on the 1:17) model.... ...... ............ ..... ... ... ..... ... ..... 67
50. Results on the 1:6 model in the Denver laboratory...... ...... ................ 67
51. The final ejector design. ...... ............ ......... ... ......... ..........~.. 69

STUDY OF PERCOLATION BENEATH SPILLWAY

52. Purpose of the study........................................................ 71
53. The hydraulic percolation modc:1 tests.............. ..... ........ ... .......... 71
54. Results oftestson hydraulic percolation model...................... ..'........ 74
55. The c:1ectricanalogy tests. ....... ......... "" ......... ...... ... ........ .... 74
56. The salt-solution electric analogy apparatus...,............................... 76
57. The tinfoil electric analogy apparatus........................................ 79