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17 Maintenance of Drainage Features failure to maintain these features in operable condition can contribute to the loss of pavement serviceability. Maintenance of drainage features for both bituminous- surfaced and concrete-surfaced pavements are described in Table 15. Drainage impacts pavement performance in many SUMMARY ways. Poor surface drainage can lead to such undesirable con- ditions as splash and spray and or slippery pavements. Poor The literature search performed for this project shows that subsurface drainage can ultimately contribute to the reduced there is little work being done on the timing of preventive structural performance of the pavement. While the mainte- maintenance treatments. However, there is a general consen- nance of features such as drainage outlets, headwalls, and edge sus on the concepts and definition of preventive mainte- drains may not be part of a pavement preventive maintenance nance, and on the treatments used in preventive maintenance program, the importance of performing routine maintenance programs. Important attributes of preventive maintenance of these features cannot be overemphasized. Drainage features treatments may be considered for selecting treatments to be are incorporated in a pavement structure to prevent the devel- included in a preventive maintenance program and for deter- opment and acceleration of moisture-related deterioration; mining when such treatments should be applied.