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Section 779.16 (a) Continued. <br />• <br />Revised 11/20/80 <br />mining, as shown on Map 16a, Kerr Mine Area Surface Water Hydrol- <br />ogy. The flume was monitored at least twice per month during <br />spring snow melt until flow ceased in July. This facility was the <br />only flow monitoring device operating during the baseline period. <br />Monitoring weirs were installed in the ephemeral streams at this <br />time, but data was not available from these facilities until after <br />the 1980 spring runoff. The data collected to date from USGS <br />Station 06619420 have been plotted on Figure 7, Kerr Mine Area <br />Surface Water Flow Hydrographs; and listed on Table 12, Kerr Mine <br />Area Surface Water Flow Data. The data demonstrate that flow in <br />Williams Draw is intermittent and occurs primarily in response to <br />snowmelt. The drainages of Sudduth, Bolton, and Bush Draws are <br />similar in drainage area, soil and vegetation type, and stream <br />gradient as indicated on Map Sa, North Park Hydrology; Map 25a, <br />Kerr Mine Area Soils; Map 18, Kerr Mine Area Vegetation, and Map <br />16a, Kerr Mine Area Surface Water Hydrology; consequently, these <br />. drainages are also classified as intermittent streams. Intermittent <br />streams, as defined in 30 CFR 701.5, drain at least one square <br />mile, have no base flow, and have sireambeds that are below the <br />local water table for at least some part of the year. Tributaries <br />to these drainages in the mine plan area are classified as ephe- <br />meral. Ephemeral streams, as defined in 30 CFR 701,5, flow only in <br />direct response to precipitation or snowmelt and have a channel <br />bottom always above the local water table. <br />(Return to page 779-41, Tipple Area) <br /> <br />779-41 as <br />