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JD -7 Mine — Drainage Design Plan 24 <br />� R k <br />� • ax <br />- r <br />Figure 8. Aerial Photograph showing Alluvial Fan and Braided Ephemeral Channels on <br />Valley Floor near Sub - Basins N -J and N -K <br />Sub - basins N -I, N -A, and N -B are located in the west - central portion of the project area, and receive and <br />route stormwater runoff from the crest of Monogram Mesa to the valley floor adjacent to the soil stockpile <br />and planned open pit waste rock pile (Figure 3). Sub - basins N -H and N -C are smaller, triangular sub - <br />basins defined by local drainage divides on the lower elevations of the escarpment, which also route <br />stormwater runoff to the valley floor adjacent to the soil stockpile and planned open pit waste rock pile <br />(Figure 9). Stormwater in sub -basin N -I that arrives at the valley floor flows 1,000 feet over a permeable <br />channel bed toward the existing topsoil stockpile. Infiltration along the flowpath is discussed in Section <br />4.7. Sub - basins N -A, N -B, and N -C direct stormwater to the valley floor south of the planned open pit <br />waste rock pile. The receiving area has been stripped of topsoil in preparation for waste rock, and few <br />distinct flow channels are evident (Figure 9). <br />4149A.140207 Whetstone Associates <br />