DOCUMENTARY HISTORY OF THE FLORIDA CANAL 151

of approximately 40 feet above sea. Fourth, it was my intention to point out
certain dangers and disturbances which could occur from a sea-level canal, if
the ground-water level, or pressure head, in the territory adjacent to the canal
or area of central control were lowered to an appreciable extent.
 I stated that I had not seen the data of the board of review for plans of
the sea-level canal procured subsequent to the recommendations for a lock
canal, and therefore had no knowledge of their plans to prevent the lowering
of the adjacent ground-water level. That a sea-level canal posssesss certain
advantages in navigation was stated; but that this type of construction also
offers greater potential dangers in controlling and protecting the ground water
is apparent. It was not my purpose to condemn a sea-level canal, provided
the construction plans are adequate to maintain the adjacent ground-water level
at approximately 40 feet above sea.
 Very sincerely yours,
 HElMAu GuNwra.


 DOCUMENT NO. 82 (FILES OF THE SHIP CANAL AUTHORITY OF STATE
 OF FLORIDA), JUNE 25, 1935

 CoxMMUCoATION FRox GzN. CALazxs P. SUMMERALL TO ID. COL
 B. C. DuNN, CoaPs or ENaNEQus, UmNID STATEs ARxY

 Under date of June 25, 1935, General Summerall, chairman of the
 Ship Canal Authority of the State of Florida, addressed to Lt. CoL
 B. C. Dunn, Corps of Engineers, United States Army, the following
 communication. Colonel Dunn, as district engineer for the Jack-
 sonville district, had served as a member of the special board of
 survey of the Army engineers in charge of the survey for the Florida
 ship canal project:
 WASHINGTON. D. C.. June 35, 1935.
 Lt. CoL B. C. DtuN,
 Corps of engineers, United States Army,
 Washington, D. C.
 Mr Dzaz CLomto DUmN: There have been brought to my attention certain
 statements in the press with regard to the proposed trans-Florida ship canal
 which quote you as having, said in a speech made at Tampa, Fla., in 1983,
 that if the proposed canal were constructed it would be necessary to adopt the
 lock type in order to prevent overdralnage as well as possible salting of the
 fresh-water supply in that portion of the State through which the canal was
 cut.
 Will you be kind enough to advise me as to whether you have been correctly
 quoted and, if so, whether the opinion expressed at that time has been modified
 or altered by a study of additional data.
 Sincerely yours,
 C. P. SItOMmALL,
 Chairman of the Ship Canal Authority of the State of Florida.


 DOCUMENT NO. 83 (FILES OF SHIP CANAL AUTHORITY OF STATE OF
 FLORIDA), JUNE 28, 195

 COMMUNICATION FRox COL. B. C. DUNN, CoRin or ENGINEEmR, TO
 GENENAz SUMMEBRAL

 Under date of June 28, 1935, Col. B. C. Dunn, formerly district
 engineer for the Jacksonville district and a member of the special
 board of survey of the Army engineers in charge of the survey of the
 Florida canal project, addressed the following letter to Gen. Charles