APPENDIX G: QUALITY ASSURANCE FOR GROUNDWATER MODELS THROUGH DOCUMENTATION 

 Cape Cod Aquifer Management Project Final Report Page G-3 



9 . Data Preprocessing and Postprocessing 



All preprocessing of model input data must be thoroughly described. 

 Special precautions to avoid data input error must be applied and 

 described. All postprocessing of model output data must be thoroughly 

 described and any computer codes utilized must be documented. Note 

 vertical exaggeration in any computer-generated surface plots or 

 cross-sections . 



10. Model Prediction 



The model output from all predictive scenarios should be presented and 

 interpreted. Present and discuss the overall model water balance, 

 highlighting salient features of the model scenario (pumpage, re- 

 charge, leakage, etc.). Restate the fundamental assumption in the 

 presentation of the model predictions. 



11. Model Results 



The physical reality of the model should be discussed ( i.e. how well 

 does the model represent the physical and chemical processes of the 

 environment being simulated?). Note if the model results support the 

 initial assumptions stated in Section h (Model Description) . 



The model results should be presented in non- technical terms. Prefera- 

 bly, a qualifying answer should be presented: "given conser^rative 

 values, withing the range of expected variation, the model results 

 show...." ...."given less conservative values within the range of 

 expected variation, the model results show...." 



12. Model Records 



The modeler should provide/keep on file the following records in digi- 

 tal form: 



a. The version of the source code utilized. 



b. The final calibration run. 



c. All predictive runs. 



References : 



Van der Heijde, Paul, K.M. , 1986, Quality assurance in computer 

 simulations of groundwater contamination: International Groundwater 

 Modeling Center, Holcomb Research Institute, Butler University, India- 

 napolis, IN 46208. 



