33 U.S.C. § 546 : US Code - Section 546: Investigation of stream flow and watersheds; surveys in connection with dams

Search 33 U.S.C. § 546 : US Code - Section 546: Investigation of stream flow and watersheds; surveys in connection with dams

The surveys of navigable streams shall include such stream-flow
measurements and other investigations of the watersheds as may be
necessary for preparation of plans of improvement and a proper
consideration of all uses of the stream affecting navigation, and
whenever necessary similar investigations may be made in connection
with all navigable streams under improvement. Whenever permission
for the construction of dams in navigable streams is granted, or is
under consideration by Congress, such surveys and investigations of
the sections of the streams affected may be made as are necessary
to secure conformity with rational plans for the improvement of the
streams for navigation.