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Page Title: E.6 Dilution Volume Method for CDF Effluent Discharges
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A new graphical implementation of TABS (FastTABS) (Lin, Jones, and
Richards 1991) has been developed that successfully addresses the need for
efficient model setup, execution, and analysis. It is mouse driven with pull-down
menus and requires a minimum of manual data entry to complete an application
from start to finish. FastTABS was designed to allow easy application of each of
the models in the TABS system which include hydrodynamics, constituent, and
sediment transport. The FastTABS software runs on Macintosh and DOS-based
personal computers as well as most UNIX workstations. A primer, user's
manual, and tutorial are available.1
E.6 Dilution Volume Method for CDF Effluent
Discharges
E.6.1 Approach
A simplified approach to evaluation of mixing zones for CDF effluent dis-
charges is presented in this section in which the volume of water required for
dilution is expressed as a rate of flow (USAEWES 1976). This approach is
generally applicable in both riverine and estuarine conditions. However, the
approach should only be applied where there is a discrete discharge source such
as a conduit or a weir. Since the effluent discharge will occur at a specified rate
Vp, the volume of ambient site water per unit time that would be required to
dilute the discharge to acceptable levels can be defined as:
V A = V p D = V p [(C  e - C  BG )/ (CWQ - C  BG )]
(E-10)
where
VA = volume of site water/unit time required for dilution, cfs
Vp = rate of effluent discharge, cfs
Ce = concentration of the contaminant in the effluent in ug/L
CBG = background concentration of the contaminant in the disposal site
water in ug/L
CWQ = applicable WQS for the contaminant in ug/L
It is assumed that the mixing zone associated with an effluent discharge will
resemble the shape in Figure E-2. Therefore, once the required volume per unit
1
A limited government license allows USACE office use of the FastTABS software
supplied through the USACE Waterways Experiment Station (WES). Other users may
obtain the software from Brigham Young University, (801)-378-5713. The point of
contact for additional information is: Dr. David R. Richards, USACE Waterways
Experiment Station, 3909 Halls Ferry Road, Vicksburg, MS 39180-6199, (601)
634-2126.
E15
Appendix E Evaluation of Mixing in Surface Waters

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