• Failure to realize how important full field data is for proper design.
• Failure of homemade equipment made with junked parts.
• Overestimating the amount and constancy of the stream flow.
• Penstocks that are too small to allow the plant to operate at full capacity.
• Failure to anticipate the expense of keeping trash racks clear and machinery in good repair.
• Failure to design and plan for winter ice buildup