The Secretary is authorized to undertake construction of small shore and beach restoration and protection projects not specifically authorized by Congress, which otherwise comply with section 426e of this title, when he finds that such work is advisable, and he is further authorized to allot from any appropriations hereafter made for civil works, not to exceed $30,000,000 for any one fiscal year for the Federal share of the costs of construction of such projects: Provided, That not more than $3,000,000 shall be allotted for this purpose for any single project and the total amount allotted shall be sufficient to complete the Federal participation in the project under this section including periodic nourishment as provided for under section 426e (c) of this title: Provided further, That the provisions of local cooperation specified in section 426e of this title shall apply: And provided further, That the work shall be complete in itself and shall not commit the United States to any additional improvement to insure its successful operation, except for participation in periodic beach nourishment in accordance with section 426e (c) of this title, and as may result from the normal procedure applying to projects authorized after submission of survey reports.