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cfs (Table 3-10 of Appendix 1). Figure 6 presents the typical storm water runoff <br /> hydrograph at the flume. The hydrograph exhibits a dual peak with initial runoff from the <br /> lower drainage in the first peak and a secondary peak as runoff travels from the upper <br /> reaches of the drainage. <br /> Station ACF-1 is located in Apache Canyon approximately one-half mile from the <br /> Purgatoire River. drainage area of the canyon is 7566 acres with cover comprised mostly <br /> of woodland. Grazing and wildlife are the major land uses. Mining is also a land use with <br /> two shafts and a power substation located in the canyon. The spring and seep survey <br /> conducted in 1984 (Appendix 4) monitored two seeps and one USGS spring, none of which <br /> were major contributions to stream flow. The flume station was monitored quaterly for <br /> water quality, however, no flow was encountered (Table 3-9 of Appendix 1). Flow was <br /> measured by the flume (Table 3-11 of Appendix 1). Of the 269 days the station was <br /> monitored, mean 24-hour discharge was 0.005 cfs or 3.62 ac-ft annually. The 1984 <br /> hydrograph for the station is presented in Figure 5 as 24-hour mean flow. Flow ranged <br /> from 0.001 to 51.6 cfs (Table 3-11 of Appendix 1). Figure 7 presents the typical storm <br /> water runoff hydrograph at the flume which exhibits a spike of flow for only those intense <br /> showers producing significant runoff. This single spike of short duration may be a <br /> function of land uses in the canyon. Since grazing is the major land use, vegetation in the <br /> valley bottom is sparse which increases the runoff potential. Also, there are two on- <br /> stream impoundments in the upper drainage which impound surface flow. The mine inflow <br /> study conducted during 1984 (Appendix 3) identified the two shafts as contributing <br /> approximately 10 gpm of inflow which may be coming from the alluvial system. All of <br /> these factors contribute to the low runoff observed at the flume station. <br /> 3.2 Ground Water <br /> Four wells in the Purgatoire River alluvium and one well in each of Apache and <br /> Ciruela Canyons were monitored monthly during 1984. Generally, wells within the <br /> Purgatoire alluvium responded directly to the level of water in the river. Wells in the two <br /> canyons responded primarily to precipitation received in the drainage. All data is <br /> contained in Tables 4-1 through 4-6 of Appendix 1. <br /> -18- <br />