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Estimate for construction of all-American canal of capacity to serve the Imperial

irrigation district and additional mesa lands with 1,600 second-feet additional capacity for Yuma project down to siphon drop

LAGUNA DAM TO SIPHON DROP, CANAL CAPACITY OF 10,600 SECOND-FEET

Excavation:

Earth, 5,045,000 cubic yards, at 20 cents.
Rock, 754,600 cubic yards, at 75 cents.

$1,009, 000

565, 950

Total... 15 per cent contingency-

1, 574, 950
236, 242

$1, 811, 192

Structures:

Alterations at Laguna Dam..
Sluice about 144 miles below dam.-
Turnout reservation canal..
Check below turnout reservation canal..
Picacho road bridge.
Raising siphon drop
Walapai lateral turnout..
Check below siphon drop-
Paved overflow for receiving storm waters into the

canal.
10 miles of telephone line.

745, 000
240, 000
10, 500
27, 500
34, 000
20, 000

7, 100
22, 000

20, 000
2, 250

1, 128, 350

169, 252

Total. 15 per cent contingency-Cost of connecting with Laguna Dam (estimated

under contract of Oct. 23, 1918).

1, 297, 602

1, 900, 000

Total.--

5, 008, 794

SIPHON DROP TO ARAZ, 9,000 SECOND-FEET CANAL

Earth, 2,600,000 cubic yards, at 20 cents..

$520, 000 Earth' fill (raising railroad grade), 30,000 cubic yards, at 30 cents...

9, 000 Raising and ballasting track 1 mile.

6, 000 Concrete lining 4,400 feet of canal along railroad track 4 inches thick, 950,000 square feet, at 17 cents...

161, 500 Total...

696, 500 15 per cent contingency

104, 475

$800, 975

Structures:

Highway bridge
Double-track railway bridge at Araz siding
1 culvert for surface drainage.
Highway bridge
Wasteway
Check.
Highway bridge
Paved overflow for receiving storm waters into the

canal..
5 miles telephone line.

34, 000
85, 000
20, 000
34, 000
235, 000
22, 000
34, 000

20, 000
1, 125

Total.---
15 per cent contingency

485, 125
72, 769

557, 894

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Grand total..

1, 358, 869

ARAZ TO UPPER POWER SITE, PILOT KNOB, OPPOSITE ROCKWOOD GATE, 9,000 SECOND

FOOT CANAL
Excavation:
Earth, 805,000 cubic yards, at 20 cents.

$161, 000 Rock, 145,000 cubic yards, at 75 cents.

108, 750
Concrete lining 400 feet canal, 86,400 square feet, at
17 cents...

14, 688

Total.
15 per cent contingency -

284, 438
42, 666

$327, 104

3

Structures:

Sluiceway
Check 3
Highway bridge--
2 culverts for surface drainage
142 miles telephone---

325, 000
22, 000
34, 000
40, 000

340

Total..

421, 340 15 per cent contingency

63, 201

484, 541 Grand total.

811, 645 UPPER POWER SITE, PILOT KNOB, OPPOSITE ROCKWOOD GATES, TO PILOT KNOB,

9,000 SECOND-FOOT CANAL Excavation: Earth 1,122,000 cubic yards, at 20 cents.

$224, 400 Rock, 1,318,000 cubic yards, at 75 cents.

988, 500 Total.

1, 212, 900 15 per cent contingency.

935 Structures:

$1, 394, 835 Railroad bridge-Culvert for surface drainage

45, 000

20, 000 192 miles telephone line.

340 Total...

65, 340 15 per cent contingency

9, 801

75, 141 Grand total.-

1, 469, 976 PILOT KNOB TO EAST SIDE MESA CANAL NO. 1 (STATION 1525) 9,000 SECOND. FOOT CANAL Excavation;

Earth, 46,736,000 cubic yards, at 30 cents.. $14, 020, 800
Earth, 1,770,000 cubic yards, at 20 cents-

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354, 000 Blow sand, 500,000 cubic yards, at 30 cents.

150, 000 Rock, 312,000 cubic yards, at 75 cents..

234, 000 Total..

14, 758, 800 15 per cent contingency

2, 213, 820 Structures:

$16, 972, 620 East mesa canal No. 1 turnout..

24, 000 Drop and check...

52, 000 26 miles telephone line..

5, 850 Total

81, 850 15 per cent contingency

12, 277

94, 127 Total

17, 066, 747

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3 Structures to be located at place selected for power site or permanent wasteway (see Power developi ment, p. 97).

* Estimate of amount of sand that will blow in during construction.

MESA CANAL NO. 1 TO MESA CANAL NO. 2, 6,000 SECOND-POOT CANAL
Excavation:
Earth, 2,344,556 cubic yards, at 18 cents-

$422, 020
15 per cent contingency -

63, 303 Structures:

$485, 323 30-foot siphon spillway for operation with power plant..

88, 740 Turnout for mesa canal No. 2.

10,000 5-mile telephone line.

1, 125 Total....

99, 865 15 per cent contingency

14, 980

114, 845 Grand total..

600, 168 MESA CANAL NO. 2 TO WEST-SIDE MAIN CANAL, 5,500 TO 1,500 SECOND-FOOT CANAL Excavation: Earth, 6,836,400 cubic yards, at 18 cents.

$1, 230, 552 15 per cent contingency.

184, 583

$1, 415, 135 Structures:

47-foot siphon spillway for operation with power plant No. 2.

96, 100 Turnout

14, 000 Check.

11, 000 Drop

28, 000 Turnout

10, 000 Wasteway to Alamo River

44, 000 Check.

9,000 Flume across Alamo River.

116, 000 Turnout

700 Check.

9, 500 Drop

26, 500 Turnout

5, 500 Do.

18, 000 Check

5, 700 Drop-

8, 500 Do..

14, 000 Wasteway at New River.

130, 000 Check..

4,000 Flume across New River.

781, 000 Turnout.

6,000 Check,

4, 000 Drop

8, 500 5 highway bridges near Calexico.

52, 500 Highway bridge, station 2350.

21, 000 Highway bridge, station 2690.

14, 000 Railroad bridge at Calexico.

15, 500 Right of way

125, 000 35 miles telephone line.

7,875 Total...

1, 585, 875 15 per cent contingency

237, 882

1,.823, 757 Grand total:

3, 238, 892 RECAPITULATION Laguna Dam to siphon drop

$5, 008, 794 Siphon drop to Araz..

1, 358, 869 Araz to upper power site, Pilot Knob.

811, 645 Upper power site to Pilot Knob.

1, 469, 976 Pilot Knob to east-side mesa canal No. 1

17, 066, 747 Mesa canal No. 1 to mesa canal No. 2.. Mesa canal No. 2 to west-side main canal.

600, 168

3, 238, 892 Total...

29, 555, 091

DIVISION OF COST

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1. Between the Yuma project for power development

and the Imperial irrigation district, including the new
lands:
Laguna Dam to siphon drop..

$5, 008, 794
Siphon drop to Araz...

1, 358, 869

$6, 367, 663 Less connection with Laguna Dam (estimated under contract Oct. 23, 1918)

1, 900, 000 Amount to be apportioned between the Yuma project and the Imperial irrigation district.

4, 467, 663
For the Yuma project, two-ninths (contract Oct.
23, 1918).

992, 814
For the Imperial irrigation district, seven-ninths
(contract Oct. 23, 1918)--

3, 474, 849

4, 467, 663 2. Between the Imperial Irrigation district and the new lands: 1

Laguna Dam to Araz (seven-ninths above). 3, 474, 849
Connection with Laguna Dam (above)-3-4-

1, 900, 000
Araz to upper power site (Pilot Knob).

811, 645 Upper power site to Pilot Knob.

1, 469, 976 Pilot Knob to east-side mesa canal No. 1.

17,066, 747

24, 723, 217 60 per cent apportioned to Imperial irrigation district..

14, 833, 930 40 per cent apportioned to new lands.

9, 889, 287

24, 723, 217 East-side mesa canal No. 1 to mesa canal No. 2

600, 168 9343 per cent apportioned to imperial irrigation district...

157 633 per cent apportioned to new lands.

40, 011

600, 168 3. Summation of costs to different interests: The Yuma project--

992, 814 The Imperial irrigation district60 per cent apportioned above.

14, 833, 930 9343 per cent apportioned above

560, 157 Mesa canal No. 2 to west-side main canal.

3, 238, 892

18, 632, 979 The new lands 40 per cent apportioned above.

9, 889, 287 633 per cent apportioned above..

40, 011

9, 929, 298 Total..

2942555, 091

Estimate for construction of all-American canal of capacity to serve the Imperial

irrigation district with 1,600 second-feet additional capacity for Yuma project down to siphon drop

FIRST ALTERNATIVE: PILOT KNOB TO MESA CANAL NO. 1, 9,000 SECOND-FOOT CANAL

A first alternative estimate was made to provide a concrete-lined section through the sand hills. The concrete lining is to be 4 inches thick and extend 2 feet above the high-water line. The following are the principal hydraulic functions:

feet.. do.

Bottom width.
Depth.--
Side slopes
Gradient..
Velocity -
Discharge.

70

15 2 to 1 0.00017

6 9, 000

_feet per second

--second-feet

[blocks in formation]

SECOND ALTERNATIVE: PILOT KNOB TO MESA CANAL NO. 1, 10,600 SECOND-FOOT

CANAL A second alternative estimate was made to provide a concrete-lined section through the sand hills, but with a deeper section than the first alternative estimate, in order to give an additional capacity of 1,600 second-feet. The concrete lining is to be 4 inches thick and extend 2 feet above the high-water line. The following are the principal hydraulic functions: Bottom width.

feet..

70 Depth.

-do

16. 3 Side slope.

2 to 1 Slope..

0, 00017 Velocity

-feet per second

6. 35 Discharge

--second-feet.. 10, 600 Excavation:

Earth, 43,605,000 cubic yards, at 30 cents. $13, 081, 500 ! ! Earth, 1,770,000 cubic yards, at 20 cents-

354, 000 Blow sand,5 500,000 cubic yards, at 30 cents.

150,000
Rock, 312,000 cubic yards, at 75 cents...-

234, 000
Concrete lining, 10,792,000 square feet, at 17
cents

1,834, 640

Total...
15 per cent contingency-

Structures:

East mesa canal No. 1 turnout..
26 miles telephone-

15, 654, 140
2, 348, 121

$18, 002, 261
24, 000
5, 850

Total ---
15 per cent contingency---

29, 850
4, 477

34, 327

Grand total.-.

18, 036, 588 The above alternative estimates include the extra excavation from the west side of the sand hills to station 1575, due to the canal being in deeper cut because of the increased slope of the concrete-lined section. The 6-foot drop at station 1575 will just be eliminated by the greater gradient. This, however, will lower the elevation of the east mesa canal No. 1, 6 feet, and thus eliminate a certain acreage on the east-side mesa that can not be served by gravity. It will also reduce the possible head at mesa power station No. 1 from 30 to 24 feet. Alternative No. 1 decreases the cost, $120,451 over a canal built in an earth section. Alternative No. 2 increases the cost $969,841 over a canal built in an earth section. The estimated cost of the other sections of the canal will remain

Estimated amount of sand that will blow in during construction.

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