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<br />,~ <br /> <br />,4 <br />j <br />, <br /> <br />w <br />C) <br />~:' <br />C~,) <br /> <br />50272.101 <br />REPORT DOCUMENTATION I'~REPORT NO. 2. 3. Recipient's Accession No. <br /> PAGE BLM-YA-PT-86-008-434l <br /> - <br />4. Title and Subtitle S. Report Oat. <br /> September, 1986 <br />Diffuse - Source Salinity: Mancos Shale Terrain .. <br /> 8. Performin. 0....nlz8tlon ReJ)t. No. - <br />7. Author(s) <br />S. A. Schumm and D. I. Gregory '1'''_7'' <br />9. Performing Or8anlzatl~n Name and Address 10. Project/Task/Work Unit No. <br />Water Engineering and Technology <br />P.O. Box 1946 11. Contraetee) or Grant(G) No. <br />Ft. Collins, CO 80522 (e) CO-9l0-PH5-59l <br /> (a) <br />12. Sponsoring Org8nizatl~n Name and Address 13. Type of Report & Period Covered <br />Bureau of Land'Mariagement <br />Colorado State Office <br />2850 Youngfield 1.. ---~ <br />Lakewood, CO 80215 <br /> - <br />15. Supplenlentary Nottas <br />.115. Abstract (Limit: 200 WOrds) <br />Large areas of the Upper Colorado River Basin are underlain by saline geologic formations <br />which contribute to the dissolved load or salinity of the Colorado River. The marine <br />Mancos Shale is~ the mos t extensive saline formation outcropping in the Upper Basin a~d it <br />is a major difftise source of salinity. The soluble mineral content (SMC) of Mancos Shale <br />can be as high as 20% but averages about 6% for areas of shale without interbedded <br />sandstones. The major soluble mineral is gypsum. <br />The Mancos Shall' is composed of three landform types: badlands, pediments, and alluvial <br />valley floors. ; Pediments and pediment remnants are relatively stable landforms. Channel <br />incision of alluvial valley floors can produce large quantities of sediment, however, <br />salt contributibn will be lower because alluvium has been leached and it has a lower SMC <br />than in-situ Mapcos Shale. Sediment and salt yield from badlands can be highly variable <br />due to sediment'storage and flushing effects, but overall erosion is rapid and runoff <br />salinity is high. Experimental erosion studies on Mancos hillslopes reveal a positive <br />relationship between salt production and sediment yield. <br />17. Document Anelysls e: DUCrlptOB <br />0704 Salinity 0808 0806 River basins <br />0807 Saline soils <br />0808 0810 Salt water <br />0807 Geologic basins <br /> b. Identlfl."'Open.En~.d Terms <br />Colorado River Salinity; Salinity Control; Mancos Shale ; Colorado River Basin <br /> c. COSATI Field/Group. .. <br />lL Avell.blllly Stetement :Available from: --_.~. <br /> 1'. Security CI... (This Report) 21. No. of 'e... <br />Bureau of Land Management Unclassified 169 <br /> 10- -- <br />Service Center (D-558B), Bldg. 50, DFC, PO Box 2504 20. Security el... (Thl. Pe..) 22. Price <br />Denver Colorado 80225-0047 <br /> <br /> <br />?j,' <br /> <br />(8.. ANSI-Z39.1I) <br /> <br />See 'nstructione on Reverse <br /> <br />Of'1'IONAL FORM ~12' (4...77) <br />tFormerly NTl5-36) <br />o.,.rtment of Commerce <br />