Experimental Evaluation of 'HELPQ' Leachate Generation and Quality
Patty, Jennifer N.
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This study describes the verification of the Hydrologic Evaluation of Leachate Production and Quality (HELPQ) computer program using physical model comparisons. HELPQ facilitates the design of confined disposal facilities (CDFs) of contaminated dredged material by estimating leachate production rates and leachate quality. To verify the HELPQ model results, physical models of CDFs were constructed and experiments conducted. The quantity of leachate produced and the salinity results from the physical models were compared with the HELPQ model predictions. Salinity concentrations were used as a basis of water quality comparison between the physical models and HELPQ. The results indicate that the HELPQ model overestimated the leachate rates, as well as the salinity concentrations. The relative percent error between the HELPQ and physical models were 19% for the cumulative leachate collected and 23% for the cumulative mass of salt collected.