Comparison of compartmentalized dynamic model, HYDRUS, and curve number methods for estimating drainage from windrow composting pads
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Design of containment facilities for runoff from windrow compost pads lacks suitable runoff prediction models for the unique surface consisting of gravel overlying compacted sub-soil material. Models used were the curve number, a commercially available numerical computer model (HYDRUS 2-d), and a compartmental model developed on the Matlab- Simulink platform based on rainfall-runoff data. The curve number model was based on infiltration, antecedent rainfall, and the percentage of pad coverage and led to a predicted vs. observed collection pond volume with a Percent Root Mean Squared Error (% RMSE) of 0.61 % compared to maximum pond volume. The prediction was relatively insensitive to deviation from the literature recommended value of 75. HYDRUS 2D applied vertical and lateral flow aspects to infiltration, storage, and subsurface transport, improving pond volume prediction with an %RMSE = 0.65 %. The Compartmental Model separately estimated outputs for infiltration, lateral seepage, and overland flow with an % RMSE = 0.76 %. Information from the compartment model can be used to develop an instantaneous unit hydrograph of compost pads and future applications for porous pavements.