Plans required under subsection (a) of this section for any water or related land resource construction project or program shall include a computation of benefits and costs made insofar as practicable in accordance with the principles, standards, and procedures established pursuant to the Water Resources Planning Act (42 U.S.C. 1962, et seq.) or acts amendatory or supplementary thereto.
Subsection (a) of this section shall not apply to any assistance furnished for the sole purpose of preparation of engineering, financial, and other plans.
In addition to any other requirements of this section, no assistance authorized under part I of subchapter I of this chapter, subpart II of part II of subchapter I of this chapter, or part IV of subchapter II of this chapter shall be furnished with respect to any capital assistance project estimated to cost in excess of $1,000,000 until the head of the agency primarily responsible for administering subchapter I of this chapter has received and taken into consideration a certification from the principal officer of such agency in the country in which the project is located as to the capability of the country (both financial and human resources) to effectively maintain and utilize the project taking into account among other things the maintenance and utilization of projects in such country previously financed or assisted by the United States.