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Hydrogeologic Framework and Simulation of Ground-Water Flow and Travel Time in the Shallow Aquifer System in the Area of Naval Support Activity Memphis, Millington, Tennessee 

    Table 11. Results of particle-tracking simulation of ground-water travel time at Naval Support Activity Memphis, Millington, Tennessee
    [~, approximately]
Parameter
Porosity value, in percent
Time-of-travel, in years
Total
Intermediate
Minimum
Porosity:
Layer 1 porosity
Confining unit 1
Layer 2 porosity
Confining unit 2
    33 
    48
    30
    36
    25 
    40
    25
    33
    20 
    30
    20
    30
Average residence time in layer 1
    ~1,000 yrs
    ~800 yrs
    ~645 yrs
Average time-of-travel to:
Layer 3 from the former N-6 hangar area
Layer 3 from grassy area near SWMU 7
Discharge to river node from SWMU 2
    ~350 yrs 
    ~490 yrs
    ~30 yrs
    ~280 yrs 
    ~380 yrs
    ~26 yrs
    ~225 yrs 
    ~300 yrs
    ~20 yrs
 

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