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| Title | WDOT-Skokomish Site near Potlatch: Volume 2. Groundwater Mounding Analysis | |||
| Month-Year Published | December 2000 | |||
| Online Availability |
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| Short Description |
A hydrogeologic study was conducted at the Washington Department of Transportation Skokomish site near Potlatch. The study was conducted to determine the suitability of the site for construction and operation of a rapid infiltration system, and if possible, identify critical design constraints for the system location. The study findings are presented in a two-volume report: Volume 1 (Carey, 2000) presents a description of site hydrogeologic and soil conditions, and Volume 2 (this report) presents the results of a modeling analysis used to estimate the mounding potential of the aquifer. The Executive Summary below describes the results of the entire study. (Also see abstract below) | |||
| Publication Number | 00-03-052 | |||
| Author(s) | Pitz, C. | |||
| Print Availability | ||||
| Number of pages | 31 pp. + app (54 total) | |||
| Keywords | groundwater, model, recommendations, Skokomish, soil, study, transport, transportation, water | |||
| Subject Waterbodies |
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| Related Web Content | Groundwater assessment in Washington state | |||
| Related Publications | Title | Relationship | ||
| WDOT-Skokomish Site near Potlatch: Volume 1. Rapid Infiltration Hydrogeologic Study | similar topic | |||
| Abstract | Long Description |
A hydrogeologic study was conducted at the Washington Department of Transportation Skokomish site near Potlatch, Washington. The study was conducted to determine the suitability of the site for construction and operation of a rapid infiltration system, and if possible, identify critical design constraints for the system location. The study findings are presented in a two-volume report: Volume 1 (Carey, 2000) presents a description of site hydrogeologic and soil conditions, and Volume 2 (this report) presents the results of a modeling analysis used to estimate the mounding potential of the aquifer. The Executive Summary below describes the results of the entire study. Using simplified assumptions about site hydrogeologic conditions, both analytical and numerical modeling methods were used to develop predictions of the mounding response of the local water table to the proposed rapid infiltration system discharge volume. Using an average-maximum, steady-state discharge condition of 500,000 gal/day, modeling suggests that the water table directly beneath an infiltration system constructed in the south-central portion of the site will not breach the ground surface in the vicinity of the system. The numerical model does predict that the mounding response of the aquifer could reach the local wetland downgradient of the infiltration area, potentially raising the water table above the ground surface in low-lying areas. The lower permeability character of the sediments in the far-western portion of the site could cause the water table mound to breach the site surface if the system is centered in this area. Recommendations are provided regarding additional field efforts that could reduce the uncertainties in the predictions described in this report. |
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