Impingement mortality calculation baseline

{
  "id": "MLC-T-ENV-013910",
  "term": "Impingement mortality calculation baseline",
  "field": "Environment",
  "term_source": "Impingement Mortality Calculation Baseline",
  "definition": "Estimate of impingement mortality and entrainment that would occur at your site assuming that: the cooling water system has been designed as a once-through system; the opening of the cooling water intake structure is located at, and the face of the standard 3/8-inch mesh traveling screen is oriented parallel to, the shoreline near the surface of the source waterbody; and the baseline practices, procedures, and structural configuration are those that your facility would maintain in the absence of any structural or operational controls, including flow or velocity reductions, implemented in whole or in part for the purposes of reducing impingement mortality and entrainment. You may also choose to use the current level of impingement mortality and entrainment as the calculation baseline. The calculation baseline may be estimated using: historical impingement mortality and entrainment data from your facility or from another facility with comparable design, operational, and environmental conditions; current biological data collected in the waterbody in the vicinity of your cooling water intake structure; or current impingement mortality and entrainment data collected at your facility. You may request that the calculation baseline be modified to be based on a location of the opening of the cooling water intake structure at a depth other than at or near the surface if you can demonstrate to the Director that the other depth would correspond to a higher baseline level of impingement mortality and/or entrainment.",
  "subject": "Regulatory activities",
  "references": [
    "40 CFR 125.93 (CFR 2013)"
  ],
  "url": "https://mlchart.com/terminology/environment/impingement-mortality-calculation-baseline/"
}