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the same as in the first estimate and are, therefore, not repeated above. In the second alternative estimate, future enlargements of the earth sections are anticipated but not covered in this estimate.

LAGUNA DAM TO SIPHON DROP, 7,600 SECOND-FOOT CANAL

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Excavation:
Earth, 3,570,920 cubic yards, at 20 cents.

$714, 184
Rock, 542,300 cubic yards, at 75 cents...

406, 725 Total..

1, 120, 909
15 per cent contingency

168, 136
$1, 289,

045 Structures : : :!! Alterations at Laguna Dam.

745, 000 Sluice about 144 miles below dam.

240, 000 Turnout, reservation canal..

10, 500 Check below turnout, reservation canal.

27, 500 Picacho road bridge.

34, 000 Raising siphon drop

20, 000 it Walapai lateral turnout.

7, 100 Check below siphon drop

22, 000 710) Paved overflow for receiving storm waters into the canal..

20, 000 Av. 10 miles of telephone line'

2, 250 Total.-

1, 128, 350 15 per cent contingency

169, 252 Imperial Valley cost of connecting with Laguna

1, 297, 602 Dam (contract of Oct. 23, 1918)

1, 600, 000 Grand total.

4, 186, 647 $IPHON DROP TO ARAZ, 6,000 SECOND-FOOT CANAL Excavation: Earth, 2,300,000 cubic yards at 20 cents -

$460, 000
Earth fill (raising railroad grade), 30,000 cubic yards
at 30 cents..

9, 000 Raising and ballasting 1 mile of track.

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.

636, 500 15 per cent contingency ---

95, 475 Structures:

$731, 975 3 highway bridges. Double-track railroad bridge at Araz siding.

102, 000

85, 000 1 culvert for surface drainage..

20, 000 Wasteway

235, 000 Check.

22, 000 Paved overflow for receiving storm water into canal.

20, 000 5 miles telephone line---

1, 125 Total.

485, 125 15 per cent contingency.

72, 769

557, 894 Grand total.

1, 289, 866 $332, 600

ARAZ TO UPPER POWER SITE, PILOT KNOB, OPPOSITE ROCKWOOD GATES, 6,000

SECOND-FOOT CANAL
Excavation:

Earth, 504,000 cubic yards at 20 cents..
Rock, 109,000 cubic yards at 75 cents---

$100, 800

81, 750
Concrete lining 400 feet canal 4 inches thick, 74,400
square feet at 17 cents...

12, 648
Total...

195, 198 15 per cent contigency

29, 280 Structures:

$224, 478 Sluiceway

325, 000 Check 6

22, 000 Highway bridge

34, 000 2 culverts for surface drainage

40, 000 142 miles telephone

340 Total.-

421, 340 15 per cent contingency

63, 201

484, 541 Grand total.

709, 019 UPPER POWER SITE, PILOT KNOB, OPPOSITE ROCKWOOD GATES, TO PILOT KNOB,

6,000 SECOND-FOOT CANAL Excavation: Earth, 702,000 cubic yards, at 20 cents.

$140, 400 Rock, 982,000 cubic yards, at 75 cents.

736, 500 Totalcune

876, 900 15 per cent contingency-

131, 535 Structures :

$1, 008, 435 Railroad bridgeCulvert for surface drainage.

45, 000

20, 000 192 miles telephone line..

340

Total...
15 per cent contingency

65, 340
9, 801

75, 141

Grand total.--

1,083, 576

PILOT KNOB TO WEST SIDE MAIN CANAL, 6,000 TO 1,500 SECOND-FOOT CANAL

Excavation:

Earth, stations 385 to 470, 1,663,000 cubic yards,

13, 146, 000

at 20 cents
Earth, stations 470 to 1525, 43,820,000 cubic yards,

at 30 cents.
Earth, station 1525 to end, 9,216,000 cubic yards,

at 18 cents
Blow sand,? 500,000 cubic yards, at 30 cents.
Rock, 294,000 cubic yards, at 75 cents..

Total..
15 per cent contingency-

1, 658, 880

150, 000
220, 500

15, 507, 980
2, 326, 197

$17, 834, 177

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

? Estimate of amount of sand that will blow in during construction,

88, 740

Structures:

24-foot siphon spillway for operation with power

plant No. 18_
47-foot siphon spillway for operation with power

plant No. 2..
Turnout
Check.
Drop-
Turnout.
Wasteway at Alamo River..
Check.
Flume across Alamo River.
Turnout.
Check.
Drop-
Turnout.
Turnoutlet
Check.
Drop-
Drop-
Wasteway at New River.
Check_cell-
Flume across New River.
Turnout
Check.
Drop-
5 highway bridges near Calexico.
Highway bridge, station 2350_
Highway bridge, station 2690.
Railroad bridge at Calexico.-
Right of way
66 miles of telephone line-

96, 100 14, 000 11, 000 28, 000 10, 000 44, 000

9, 000 116, 000

700 9, 500 26, 500

5, 500 18, 000 5, 700 8, 500 14, 000 130, 000

4, 000 781, 000

6, 000 4, 000 8, 500 52, 500 21, 000 14, 000 15, 500 125, 000 14, 850

Total..
15 per cent contingency-

1, 681, 590

252, 238

1, 933, 828

Grand total..

19, 768, 005

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 (7,600 to 1,500 second-feet)

RECAPITULATION

Laguna Dam to siphon drop...
Siphon drop to Araz.--
Araz to upper power site, Pilot Knob.
Upper power site to Pilot Knob..
Pilot Knob to west-side main canal..

$4, 186, 647 1, 289, 869

709, 019 1,083, 576 19, 768, 005

Total----

27, 037, 116

. Constructed for full development as far as possible. Will cost about the same as though built full height.

DIVISION OF COSTS

1. Between the Yuma project for power development

and the Imperial irrigation district, including in-
terest of new lands in structures:
Laguna Dam to siphon drop, excavation.

$1, 289, 045 Siphon drop to Araz, excavation..

731, 975

$2, 021, 020 Amount to be apportioned between the Yuma project and the Imperial irrigation district For the Yuma project, one-third (contract Oct. 23, 1918)

673, 673
For the Imperial irrigation district, two-thirds
(contract Oct. 23, 1918)--

1, 347, 347

2, 021, 020 Laguna Dam to siphon drop, structures

1, 297, 602 Siphon drop to Araz, structures..

557, 894

1, 855, 496
Amount to be apportioned between the Yuma
project and the Imperial irrigation district,
For the Yuma project, two-ninths (contract
Oct. 23, 1918) -

412, 332
For the Imperial irrigation district, seven-
ninths (contract Oct. 23, 1918).

1, 443, 164 2. Between the Imperial irrigation district and the

1, 855, 496 new lands, structures only: Connecting with Laguna Dam (contract Oct. 23, 1918).

1, 600, 000 Laguna Dam to Araz (seven-ninths above). 1, 443, 164 Araz to upper power site, Pilot Knob.

484, 541 Upper power site to Pilot Knob.

75, 141

3, 602, 846 60 per cent apportioned to the Imperial irrigation district.

2, 161, 708 40 per cent apportioned to the new lands--- 1, 441, 138

3, 602, 846 24-foot siphon spillway for operation with power plant No. 1...

88, 740 9343 per cent apportioned to the Imperial irrigation district.

82, 824 633 per cent apportioned to the new lands

5, 916 3. Summation of costs to different interests:

88, 740 The Yuma project

One-third apportioned on excavation above.- 673, 673
Two-thirds apportioned on structures above. 412, 332

1, 086, 005 The new lands

40 per cent apportioned on structures above. 1, 441, 138
643 per cent apportioned on structures above.

5, 916

1, 447, 054 The Imperial irrigation district-.

Total cost.
Less amount apportioned to Yuma project,

1

.:27, 037, 116 as given above

1, 086, 005
Less amount apportioned to new land, as
given above.

1, 447, 054

2, 533, 059 Net cost to Imperial irrigation district

24, 504, 057

POWER DEVELOPMENT

(a) Plans are made for a temporary or construction power plant at or near Pilot Knob, where a drop of about 30 feet can be obtained by discharging the water into the Imperial Canal. This power plant should be constructed and made available for the generation of power at as early date as possible in order

to furnish cheap power for construction purposes. The plans are for the development of two units of 4,500 turbine horsepower each, with provision for adding a third unit of the same size. In the preliminary report the temporary power plant was located at the lower or south end of the rock cut at Pilot Knob. Since that report was made another site nearly opposite the Rockwood gate has also been investigated. Test pits at both sites have been put down as deep as possible without resorting to pumping of the water. The tailrace of the upper one of these sites would discharge into the Imperial Canal between the Rockwood and Hanlon gates. The tailrace from the lower site will discharge into the Imperial Canal below Hanlon gate. It is as yet a question which of these sites should be developed. If developed at the upper site and a siphon spillway used to regulate the flow in conjunction with the power house and later a sluice gate located at the lower power site were constructed, considerable heavy construction work would be avoided until after the upper portion of the system could be placed in operation and electric power generated. This would give an estimated expenditure of $4,880,258 for canal construction from Laguna Dam after deducting the following items from the first three items under "Recapituation” (p. 89): Cost of connecting with Laguna Dam.

$1, 900, 000 Sluiceway and check.--

347, 000 15 per cent contingency on above.

52, 050

2, 299, 050

Total deduction..
To which should be added:
Construction power plant.
Tailrace.

704, 920 95, 080

Total

800, 000 Making total expenditure of $5,680,258.

(6) West of the sand hills there are two drops where it is planned to develop power. These we have called power plant No. 1 and power plant No. 2.

(c) At power plant No. 1, which is located 4 miles west of the east-side mesa canal, there is a fall of 24 feet. Three miles east of this power site there is a drop of 6 feet, which may in the future be carried downstream to power plant No. 1 by raising the canal banks and the structure at the power plant, giving a total fall of 30 feet. The plans at this site are for the development of 4 units of 4,500 turbine horsepower each.

(d) Power plant No. 2 is situated 5 miles west of power plant No. 1. At this site a head of 47 feet can be obtained. The plans are for the development of 4 units of 6,500 turbine horsepower each.

(e) The above developments are for the maximum capacity of the canals. At power plants Nos. 1 and 2 the discharge during the minimum flow of the river may fall to 20 or 25 per cent of the maximum capacity. This will limit the amount of power available for commercial purposes after deducting the amount required by the Yuma project and Imperial Irrigation District for operating purposes and pumping at the period of minimum discharge.

(f) It is planned that the power equipment installed in the construction power plant at Pilot Knob will be used in power plants Nos. 1 and 2. The first plant will be built entirely for construction purposes. Credit has been given in the estimate for the machinery that will be transferred to the other plants. Therefore the cost of the plant given below should be depreciated within the period covered by construction and charged to the cost of furnishing power for construction purposes.

(g) The estimated cost of developing the power plants without transmission lines is as follows:

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