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plants on the mesa, is estimated at $24,304,048. This includes $1,600,000 to be paid to the United States in installments, without interest, for the right to connect with the Laguna Dam, and to utilize diverting works in common with the Yuma project. The amount which should be charged by the United States to an all-American canal project with canal capacity of 9,000 second-feet, which is to supply water to an area of 900,000 acres, for the privileges of connecting with the Laguna Dam, has been estimated at $1,900,000. This amount should be apportioned to the Imperial irrigation district and to outside lands in the proportion of the contributing areas. It will be payable in installments to be fixed by the Secretary of the Interior extending over a period of 20 years without interest. The Imperial irrigation district should obligate itself, as is contemplated by the agreement of October 23, 1918, between the Secretary of the Interior and the directors of Imperial irrigation district, to make the payment of its proportional part of this sum, or in round numbers about 60 per cent thereof. The amount which should be paid by Imperial irrigation district to the United States for the privilege of connecting with the Laguna Dam, if an allAmerican canal is constructed at a capacity of 6,000 second-feet to supply water only to lands within the Imperial irrigation district, is $1,600,000. This amount will be payable in installments extending over a period of 20 years without interest. The agreement under which this board is acting makes it imperative to consider only a high-line canal located entirely on American territory. The unfortunate position of the boundary line interferes with the consideration of a location farther to the south, which would in all probability be better adapted to the configuration of the ground. The agreement of October 23, 1918, between the Secretary of the Interior and the directors of the Imperial irrigation district provides for the construction of an all-American canal by the Imperial irrigation district. Should the district fail to construct an all-American canal as contemplated under this agreement the question will then arise on other methods of procedure. This board believes that means must be found for extending the irrigation in the Imperial Valley to the mesa and other lands that can be commanded by canal from the Laguna Dam, and that, from an engineering point of view, there would be material advantage in a canal location not restricted by the international boundary. After a high-line canal has been constructed under the pending agreement or otherwise the United States should make provision for the necessary submains and laterals to serve the lands which are outside of Imperial irrigation district and dispose of the public lands, granting long time in which to make payments and a low rate of interest on deferred payments. The canal has been planned as an open canal through the sand hills. The canal banks are to be fairly flat on slopes 2 to 1, and a berne 30 feet wide is to be provided at the surface of the mesa formation, which is the base of the sand dunes. The board is of the opinion that the drifting sand can be checked by a proper disposal of spoil dumps and by delivery upon its surface, for some distance away from the canal, of material excavated by suction dredges from the canal prism. Vegetation can be made to grow on the sand dunes by irrigation with pumped water, as a barrier will thus be created that will materially reduce the amount of sand which would otherwise blow into the canal. The board, therefore, concludes that the construction of a large capacity canal through the sand hills is feasible. If the all-American canal project is not carried out under the terms of the agreement of October 23, 1918, and if there is delay in otherwise making provision for the same, the connection of the Imperial Canal with Laguna Dam should still be made at once. Furthermore, if the construction of a high-line canal, heading at Laguna Dam, must be long deferred the installation of a power plant at full capacity to meet the requirements of the Yuma project may become necessary. Such a connection would involve the enlargement of the Yuma Canal down to the Siphon Drop to a capacity of 7,600 second-feet, with alterations at the Laguna Dam and the construction of a canal from the Siphon Drop to Pilot Knob at a capacity of 6,000 second-feet. There should be no unnecessary delay in carrying out this work for which funds might be provided according to circumstances, either jointly by the United States for the Yuma project and by the Imperial irrigation district, or by the United States alone, subject to repayment of its share of the cost with interest by the Imperial irrigation district; or by the Imperial irrigation district alone, subject to a

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participation in power by the Yuma project upon a repayment to the district of a part of the construction cost. Of the total canal construction cost a certain part should be charged to power development. This may be estimated on the basis of power development near Pilot Knob on the assumption that the cost of getting water for power to Araz (up to 6,000 second-feet) should be charged in equal amounts to irrigation and to power. There should therefore be charged to power one-third of the cost of canal construction down to Araz, if the all-American canal is constructed at a capacity of 9,000 second-feet and one-half thereof if the canal is constructed at a capacity of 6,000 second-feet, or if only the connection with the Laguna Dam is made at this capacity. The Yuma project should be charged for the reserved interest in power twoninths, or one-third of the cost of the alterations at the Laguna Dam and canal construction at Araz, depending on whether the all-American canal is given a capacity of 9,000 or only 6,000 second-feet, and 40 per cent of the estimated cost of a power plant at Araz. Consequently the apportionment and distribution of canal and power construction costs should be as follows:

All-American canal, 9,000 second-feet capacity:
Estimated total cost of canal construction, including the cost
of the right to connect with Laguna Dam, but not including

the cost of power development (p. 18, Engineer's report)____ $26,732, 602 Charge Yuma project with two-ninths of $4,097,401 (p. 219,

Engineer's report) --------------------------------------- 910, 534 Charge Imperial Valley with------------------------------- 25, 822, 068 Right to connect with Laguna Dam------------------------- 1,900, 000

Net canal construction cost charged to Imperial Valley----- 23,922, 068

The distribution of cost, according to area, to Imperial irrigation district and to the mesa and other outside lands, would be about as follows:

Imperial irrigation district, about 60 per cent: .

Right to connect with Laguna Dam-------------- $1, 140,000

Net canal construction cost---------------------- 14, 353, 241 $15,493, 241

Outside lands, about 40 per cent:

Right to connect with Laguna Dam-------------- 760,000

Net canal construction cost--------------------- 9, 568, 827 10, 328,827 Total--------------------------------------------------- 25, 822,068 Estimated cost of power plants (p. 27, Engineer's report)________ 4, 508,690

Charge Yuma project with 40 per cent of $1,886,690 (p. 28 Engineer's report)--------------------------------------------- 754, 676 Charge to Imperial Valley-------------------------------- . 3, 754,014

If the estimated cost of power plants, $3,754,014, charged as above to Imperial Valley, is distributed to the Imperial irrigation district and to the mesa and other outside lands in the proportion of area, or about 60 per cent to the district and 40 per cent to the outside lands, then :

Imperial irrigation district investment in power will be about_____ $2,252,408 The outside lands investment in power will be about_____________ 1, 501,606 Total--------------------------------------------------- 3, 754,014

The distribution of all construction costs will be about as follows: To imperial irrigation district:

For right to connect with Laguna Dam--_________ $1, 140,000
Part cost of power plants_______________________ 2, 252,408
Part net canal Construction cost-----------______ 14, 353, 241

Total--------------------------------------------------- 17, 745, 649 To the mesa and other outside lands:

For right to connect with Laguna Dam --------- $760,000

Part cost of power plants______________________ 1, 501,606

Part net canal construction cost--______________ 9, 568, 827
Total---------------------------------------------------- $11,830, 433

Total estimated cost chargeable to Imperial Valley of an allAmerican canal, with a capacity of 9,000 second-feet, including power plants, and including right to connect with the Laguna Dam, but not including $1,665,210 chargeable to Yuma project – 29, 576,082 Canal construction chargeable to power: One-third of cost to Araz, one-third of $4,097,401 (page 19,

engineer's report).---------------------------------------- 1, 365, 800 Gross construction cost chargeable to power: Estimated cost of power plants (page 27, engineer's report) -- 4, 508,690 Part of canal construction cost, as above_-------------------- 1, 365, 800 Total---------------------------------------------------- 5, 874,490 Yuma project will be charged for an interest in power: Part of canal construction cost to Araz, as above_____________ 910, 534 Part of power plant construction cost, as above_______________ 754, 676 Total---------------------------------------------------- 1,665, 210

All-American canal, 6,000 second-feet capacity:
Estimated total cost of canal construction, including the cost
of the right to connect with Laguna Dam, but not includ-
ing the cost of power development (page 24, engineer's

report) ------------------------------------------------- 24, 304,048 Charge Yuma project with one-third of $3,549,626 (page 25, engineer's report)---------------------------------------- 1, 183,209 Charge Imperial irrigation district with_____________________ 2, 120,839 Right to connect with Laguna Dam------------------------- 1,600,000 Net canal construction, cost------------------------------ 21, 520,839 Estimated cost of power plants (page 27, engineer's report)___ 4, 508,690 Charge Yuma project with 40 per cent of $1,886,690 (page 28, engineer's report).---------------------------------------- 754, 676 Charge to Imperial irrigation district--------------------- 3, 754,014

Total estimated cost chargeable to Imperial irrigation district of an allAmerican canal with a capacity of 6,000 second-feet, including power plants and including cost of the right to connect with the Laguna Dam, but not including $1,937,885 to be charged to the Yuma project as follows:

Right to connect with Laguna Dam----------------------------- $1,600,000 Part cost of power plants-------------------------------------- 3, 754, 014 Part net canal construction cost __ 21, 520,839

Total-------------------------------------------*--------- 26, 874, 853

Canal construction cost chargeable to power:
One-half of cost to Araz, one-half of $3,549,626 (page 25, en-

gineer's report) ------------------------------------ 1, 774, 813

Gross construction cost chargeable to power:
Estimated cost of power plants (page 27, engineer's report) --- 4, 508, 690
Part of canal construction cost, as above____________________ 1, 774, 813
Total ___ 6, 283, 503

Yuma project will be charged for an interest in power (6,000 second-foot canal):

Part of canal construction cost to Araz, as above____________ 1, 183, 209

Part of power plant construction cost, as above______________ 754, 676

Total---------------------------------------------------- 1, 937, 885

Connection of Imperial canal with the Laguna Dam (considered
alone). Canal capacity, 6,000 second-feet:
Estimated cost of canal construction (page 29, engineer's re-

Port) -------------------------------------------------- $7,039,041 Charge Yuma project with one-third of $3,549,626 (page 25,

engineer's report)---------------------------------------- 1, 183, 209 Charge Imperial district with------------------------------- 5, 855, 832 Right to connect with Laguna Dam------------------------- 1,600,000 Net canal construction cost to be charged to Imperial irriga

tion district--------------------------------------------- 4, 255, 832. Estimated cost of power plant (page 28, engineer's report) --~ 1,886, 690 Charge Yuma project with 40 per cent thereof_______________ 754, 676 Charge Imperial irrigation district with 60 per cent thereof.--— 1, 132,014

The estimated cost chargeable to Imperial irrigation district for the construction of a connection with the Laguna Dam, at a capacity of 6,000 secondfeet, including a power plant at Pilot Knob, but not including $1,937,885 chargeable to the Yuma project, nor $1,600,000 for the right to connect with Laguna Dam is therefore:

Part net estimated cost of canal construction, as above____________ $4, 255, 832 Part cost of power plant, as above------------------------------- 1, 132,014 Total---------------------- ---- __ 5,387, 846

Canal construction cost chargeable to power:
One-half cost to Araz, one-half of $3,549,626 (page 25, engi-

neer's report) ------------------------------- 1, 774, 813 Gross construction cost chargeable to power: Estimated cost of power plant at Pilot Knob (page 28, engineer's report) -------------------------------------------- 1,886, 690 Part of Canal construction cost, as above---------------------- 1, 774, 813 Total----------------------------------------------------- 3, 661, 503 Yuma project will be charged for an interest in power: Part canal construction cost to Araz, as above_________________ 1, 183, 209 Part power plant cost, as above------------------------------ 754, 676 Total----------------------------------------------------- 1,937, SS5

Power should be held available for the requirements of the Yuma project and the Imperial irrigation district and any organization for the irrigation of mesa and other lands. Power thus required should be paid for at cost plus 10 per cent. Any power in excess of such requirements should be treated as commercial power and sold. The interest of the Yuma project should be protected in the amount of power for which a construction charge is placed against the project, and if this power be not generated at or near Araz it should be transmitted back to that point without transmission cost to the Yuma project.

The participation in profits from power sales should be made proportional to the relative investments in the Imperial Valley.

For a high-line canal project to the Imperial Valley some water from storage should be made available. This can best be accomplished if the United States will undertake the construction of storage reservoirs on the Colorado River from which water could be made available for power and irrigation at rates which would cover cost. Any such storage on a large scale would also have some beneficial effect in reducing the peak of the flood discharge in the lower river, thereby cutting down the flood menace to the submersible lands—in particular to those of the delta region and the Imperial Valley.

Respectfully submitted.

W. W. SCHLECHT.
C. E. GRUNSKY.

{Report of Porter J. Preston, engineer ** of surveys and examinations, Dec. 7,

To: The Board of Engineers, All-American Canal.
Subject: Preliminary report and cost estimate.

1. INTRODUCTION.

(a) A contract was entered into by the Secretary of the Interior and the directors of the Imperial irrigation district on February 16, 1918, for a complete investigation, survey, and cost estimate of an all-American canal from Laguna Dam, Ariz.-Calif., into the Imperial Valley.” The contract further provides that “in order to determine the possibility and feasibility of carrying an adequate supply of water for the irrigation of arid lands in the Imperial Walley; that such surveys shall be made in sufficient detail so that the character and cost of development shall be shown "; such surveys shall also investigate the ways and means by which power may be developed as an incident to the construction of such irrigation works and the value and possible uses thereof.”

(b) Under this contract a study of the available data was made in the Yuma reclamation office, and early in March a survey was commenced.

(c) Frequent meetings and conferences have been held with the board and

individual members of the board, from time to time, and their counsel and

advice, aside from their official duties under the contract, have been of material assistance in the work of making the surveys, and the preparation of this estimate.

2. PURPOSE OF PRELIMINARY REPORT.

(a) Under date of October 23, 1918, the directors of the Imperial irrigation district entered into a contract with the Secretary of the Interior for a connection with Luguna Dam and the construction of an all-American canal and appurtenant structures, based on the surveys and investigations covered by the contract under which these investigations are being made.

(b) The contract of October 23, 1918, provides for the ratification of the contract on or before six months from the date of signing the same. The Imperial irrigation district now desires to submit the question of the ratification of the contract of October 23, 1918, to a vote of the people at an early date. The directors have requested that a preliminary report be made of the estimated cost of connecting with Luguna Dam and constructing the all-American canal, in order that the voters in the district may have knowledge of the cost of the project before voting upon the ratification of said contract. Under the circumstances it has been deemed best to furnish the information desired at this time in a preliminary report. There are some features of the project that require further investigation and study, but these will not materially change the ultimate estimated cost of the project.

3. EARLIER SURVEYS.

(a) Several surveys and estimates have heretofore been made, for the purPose of diverting water at Laguna Dam into the Imperial Valley and onto the mesa lands, by what has been termed a high-line canal. These surveys either followed along the route of or contemplated the enlargement of the present Yuma Main Canal from Laguna Dam to Siphon Drop, and thence along the base of the hills bordering the valley from this latter point to the Southern Pacific main line track. From this point the surveys followed the right bank of the Colorado River, generally parallel therewith and but a short distance from the river bank, to a point near the international boundary line. From this latter point the plan followed by the several surveys have differed to some extent, and are described below more in detail.

(b) In 1903 and 1904 the United States Geological Survey made a topographical survey of the Yuma project on the California side of the river, extending the topography to the international boundary, and thence westerly for about 2 miles, covering a strip along and parallel with the boundary and about 500 feet in width.

(c) In 1908 the Reclamation Service made a topographic survey of the greater portion of the mesa east of the present Imperial East High-Line Canal as far north as the Southern Pacific Railroad. At this time some preliminary

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