Reclaimed mine area runoff control using culverts

Surface drainage systems for mine or tailings areas require measures to limit or prevent erosion. Exploitation of broad, mildly-sloping areas as surge ponds can dramatically reduce peak runoff flows. Efficient utilization of surge pond storage requires restriction of flow, and culverts provide a significant advantage over conventional open channel structures in the degree of restriction provided. Multiple culverts with staggered inlet elevations allows a great deal of flexibility in regulating discharge from surge ponds. A case study with replacement of V-Notch structures by culverts in a reclaimed mine area allows comparison of the achievable peak flow attenuation. Potential pitfalls of the use of culverts as well as potential ancillary benefits are analyzed. General criteria for consideration of culverts in the design process are presented.