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Gravel Effect on Wastewater Infiltration from Septic System Trenches

^a Crop and Soil Sciences Dep., Univ. of Georgia, Athens, GA 30602
^b Savannah River Ecology Lab, Aiken, SC 29803

View larger version (19K): [in a new window]   Fig. 1. Model space for chamber and gravel systems without sidewall flow.

View larger version (21K): [in a new window]   Fig. 2. Model space for chamber and gravel systems with sidewall flow.

View larger version (23K): [in a new window]   Fig. 3. Simulated infiltration rate in the BC horizon of the Cecil soil as a function of time in a chamber system and gravel systems configured to show the effect of gravel masking and embedded gravel.

View larger version (33K): [in a new window]   Fig. 4. Simulated flux into the BC horizon at the trench surface with the chamber system and the gravel system configured to show the effect of gravel masking and embedded gravel after 1 d.

View larger version (19K): [in a new window]   Fig. 5. Unsaturated hydraulic conductivity curve for the BC horizon and biomat flux in the chamber system and embedded gravel system (calculated from Eq. [1]) as a function of matric head in the soil beneath the biomat.

View larger version (20K): [in a new window]   Fig. 6. Pressure (matric) head distribution in the BC soil block as a function of depth below the soil–trench interface in a simulation with no biomat, the chamber system, and the standard system configured to simulate embedded gravel at a time of 2 d.

View larger version (20K): [in a new window]   Fig. 7. Unsaturated hydraulic conductivity curve for the Bt1 horizon and biomat flux in the chamber system and embedded gravel system (calculated from Eq. [1]) as a function of matric head in the soil beneath the biomat.

View larger version (19K): [in a new window]   Fig. 8. Pressure (matric) head distribution in the Bt1 soil block as a function of depth below the soil–trench interface in a simulation with the chamber system and the standard system configured to simulate embedded gravel at a time of 2 d.