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INTRODUCTION <br />• Sedimenution ponds, diversion collection ditches, culverts, and other assodated drainage <br />structures together comprise the drainage and sediment control system for the Southfield Mine <br />and Loadout. These structures have been designed and rnntructed or installed by EFCI and it's <br />predecessor, Dorchester Coal Company (Dorchester), wi[hin a dynamic framework of changing <br />regulations, constantly improving design practices, and new materials. <br />Over the years, both Dorchester and EFCI have utilized commonly accepted engineering and <br />opera[ional practices to design and constructor install drainage structures. Selection and design <br />of erosion control practices for diversion/rnllection ditches and pond isle[ and outlet structures <br />have been based on a broad spectrum of engineering and hydrologic design studies and <br />references. <br />In the in[erest of providing a rnnsistent basis for future erosion control designs, EFCI in early <br />1993 reviewed available references and adopted the design methodologies presented in the Surface <br />Mining Water Diversion Design Manual (Office of Surface Mining, 1982). The following <br />sections aze extracted from this reference and represent the general basis for design of erosion <br />protettion subsequent to adoption. It should be noted that this reference serves only as guidance <br />for design practices and methodologies and actual prattices and methodologies may vary as <br />appropriate to most acwrately reflect site spedflc conditions and any changes in [ethnology, <br />accepted practice, or available materials. <br />• <br />~J <br />