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2009-06-18_GENERAL DOCUMENTS - C1981018
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2009-06-18_GENERAL DOCUMENTS - C1981018
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Last modified
5/19/2020 12:11:52 PM
Creation date
6/22/2009 11:04:21 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981018
IBM Index Class Name
General Documents
Doc Date
6/18/2009
Doc Name
Proposed Decision & Findings of Compliance for RN5
Permit Index Doc Type
Findings
Email Name
JDM
Media Type
D
Archive
No
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that occurred during the fall and summer months resulted from thunderstorm activity; <br />however, peak flows during the year were greatest during the spring as a result of <br />snowmelts. The largest event recorded for Red Wash during the inventory period was <br />240 cfs, which was generated as a result of late winter snowmelt. Due to the nature and <br />intent of crest gage type flow monitoring, it has limited usefulness for identifying water <br />availability criteria necessary for alluvial valley floor interpretation. Therefore, the most <br />useful information supplied by the permittee :For AVF purposes is the estimation of <br />average annual streamflow calculated through Grunsky's formula. The amount of water <br />available annually, as estimated through Grunsky's method, indicates that Red Wash <br />further qualifies as a potential alluvial valley floor. <br />In response to requirements for additional information (Stipulation No. 8), the permittee <br />prepared and submitted a report entitled "Red. Wash Drainage Basin Alluvial Valley <br />Floor Study" to the Division on July 23, 1983. The emphasis of this report was to <br />provide additional detailed information on the characteristics of the alluvial body and the <br />availability of sufficient water to support agricultural activities. Based on the information <br />contained in the report and information supplied to the Division by the Meeker Office of <br />the Soil Conservation Service regarding regional flood irrigation practices, the Division <br />made a negative alluvial valley floor determination for those portions of Red Wash <br />situated within the Deserado mine permit area. <br />Past findings of the Division regarding the AVF determination for Red Wash and its <br />associated alluvium are as follows: <br />Red Wash Alluvial Valley Floor I)etermination <br />The Division determined that Red Wash and its associated alluvium meet the geomorphic <br />criteria, but not the irrigation requirements, of an AVF, as outlined in OSM's "Alluvial <br />Valley Floor Guidelines" established pursuant to the Surface Mining Control and <br />Reclamation Act of 1977. <br />Pursuant to Rule 2.06.8(3)(c), the Division finds that there is not sufficient water to <br />support agricultural activities. The Division therefore concludes that Red Wash is not an <br />Alluvial Valley Floor. <br />Scullion Gulch <br />Water Availability Criteria - Artificial Flood Irrigation <br />As with Red Wash, flow events along Scullion Gulch were monitored using a crest stage <br />gage. During the two year inventory period conducted by the permittee, only three runoff <br />events were recorded, the highest event measuring 185 cfs. Again, crest gage data has <br />only limited application of AVF purposes. The mean annual yield estimations provided <br />by the peimittee are more applicable for identifying the amount of water that may be <br />expected for Scullion Gulch. The permittee's estimations, derived using Grunsky's <br />formula, indicate that the potential average annual water yield from the Scullion Gulch <br />watershed is 202 acre feet. This corresponds to approximately 0.34 inches of runoff. The <br />Deserado Mine 42 June 18, 2009
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