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<br />. <br /> <br />. <br /> <br /><0 <br />r-- <br />~" herbieides, mindful of environmental eoncern, may be the most effective and <br /> <br />...... <br />~ eost effeetive. Over the past 2 years, the Service, in cooperation with <br />c::' <br /> <br />E1aneo, DuPont, and Ve1sieo1, has made experimental app1ieation of tebuthiuron, <br /> <br />fosamine, hexazinone, and dieamba to mesquite and sa1teedar. The results of <br /> <br />fosamine on sa1teedar look very good while the soil-applied herbieides still <br /> <br />need additional time for proper evaluation. The experimental sites at Caba110 <br /> <br />are feneed to prevent aeeess by 1ivestoek. These evaluations will be eontinued <br /> <br />for the next 2 to 3 years. <br /> <br />Elephant Butte Reservoir and Rio Grande Channel <br /> <br />On Oetober 1, 1979, the projeet initiated a eomp1ete sediment survey of <br /> <br />Elephant Butte Reservoir for the purpose of updating area-eapaeity eurves and <br /> <br />tables, whieh, in turn, will allow the Rio Grande Compaet Commission to more <br /> <br />aceurate1y determine the amount of Rio Grande water delivered by New Mexieo to <br /> <br />Texas at Elephant Butte Dam. The tables and eurves are also required to' pro- <br /> <br />per1y allocate international waters between the United States and Repub1ie of <br /> <br />Mexieo. The survey of nearly 85 range lines via standard land survey and <br /> <br />hydrographie methods was eomp1eted by the end of February 1980. Draft eopies of <br /> <br />the new area capaeity tables are bein~ reviewed and should be ready for pub1iea- <br /> <br />tion by April 1981. <br /> <br />Caba110 Reservoir <br /> <br />A eomp1ete silt survey of Caba110 Reservoir was begun in October 1980. All <br /> <br />fieldwork for the survey was completed by the end of January 1981. Analysis of <br /> <br />data has begun and pub1ieation of new area capaeity tables for Caba110 is anti- <br /> <br />cipated for early 1982. <br />