Pond Depth Sample Clauses

Pond Depth. The rule requires a maximum pond depth of 12 feet and a mean depth (pond volume divided by the pond area at the control elevation) between 2 and 8 feet. Many of the nutrients and metals removed from the water column accumulate in the top few inches of the pond bottom sediments (Yousef et al. 1990). If a pond is deep enough, it will have a tendency to stratify, creating the potential for anaerobic conditions developing at the bottom of the pond (CDM 1985). An aerobic environment should be maintained throughout the water column in wet detention ponds in order to minimize the release of nutrients and metals from the bottom sediments (Xxxxxx et al. 1990). The maximum depth criteria minimizes the potential for significant thermal stratification which will help maintain aerobic conditions in the water column that should maximize sediment uptake and minimize sediment release of pollutants. On the other hand, the minimum mean depth criteria minimizes aquatic plant growth which may be excessive if the pond is too shallow. The Department will consider pond depths in excess of 12 feet providing the applicant can provide reasonable assurance that the proposed pond depth will not cause adverse water quality conditions due to anaerobic bottom conditions.
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