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2015-09-09_PERMIT FILE - C1981019A (27)
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2015-09-09_PERMIT FILE - C1981019A (27)
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Last modified
5/11/2020 4:41:59 PM
Creation date
10/20/2015 10:08:37 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981019A
IBM Index Class Name
Permit File
Doc Date
9/9/2015
Doc Name
Streeter Gulch Ditch, SW Tributary to Streeter & SE Tributary to Street Channel Designs (Permanent)
Section_Exhibit Name
Exhibit 07 Item 14 Appendix Exh7-14E
Media Type
D
Archive
Yes
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Appendix Exh7-14E <br />Streeter Gulch Ditch, Southeast Tributary to Streeter and Southwest Tributary to Streeter <br />The Streeter Gulch Ditch is located in Sections 3, 9, and 10 of T3N, R93 W. The alignment of <br />this ditch is shown on Map 41. The design profile is provided on Map 33. The upper portion of <br />this channel was redesigned following a revision to the postmining topography associated with <br />this TR -105 update. The entire channel has been re -modeled to track with the revised ditch <br />geometry. Alignment and watershed characteristics are presented on Exh. 7-14E, Figures 1 and <br />2. <br />The upper segments of the Streeter Gulch Ditch and its tributaries, i.e., those segments with <br />tributary areas less than one square mile, are designed for the 10 year 24 hour runoff flow, in <br />accordance with Rule 4.05.3. The lower portions of Streeter Gulch Ditch are designed for the <br />100 year runoff flow to meet the requirements of Rule 4.05.4 for drainages greater than one <br />square mile. While the total tributary area to the Streeter Gulch system is 1,359.1 acres, the <br />break point at which the tributary area is less that one square mile is located at approximately <br />Sta. 110 on the main stem of Streeter Gulch Ditch. <br />There also 4 additional small, three acre -ft stockponds that have been added to the model to <br />reduce flows downstream. As shown on the attached SEDCAD printout, the design storm <br />produces a peak discharge of about 155.2 cfs and a total runoff volume of about 38 acre-feet at <br />its lower end (Station 0+00). At the inlet to Stock Pond 4, which is at the confluence of <br />Buckskin Draw, the design storm is the 10 year storm and a flow of 95 cfs. The flow quantities <br />for the portions of the stream subject to the 100 year design requirement are presented in the <br />attached SEDCAD model. The flow quantities for the portions of the Streeter Gulch Ditch <br />system that are designed for the 10 year event are presented in the SEDCAD model included in <br />Volume 2D, Streeter Pond - OOIA Introductory text. The calculated flows are based on the 100 <br />year 24 hour and the 10 year 24 hour storm depths as appropriate, and curve numbers assigned to <br />undisturbed and reclaimed lands in various stages of reclamation as described in Table 1 in the <br />Introductory Text for Exhibit 7 (Vol. 2D). Except for the Streeter Pond surface itself and a small <br />15.5 acre tract that drains directly into Streeter Pond without flowing in the Streeter Gulch Ditch <br />system, it is assumed that all of the land is at post -mining topography and is contributory to the <br />channel. <br />This design is applicable to the already completed portions of Streeter Gulch Ditch below <br />approximate Sta. 80+00 and the segments that are yet to be constructed following completion of <br />regrading to the post -mining topography in the upper reaches of the watershed. Existing channel <br />dimensions were input into the model for those completed segments. For ease of construction on <br />portions yet to be constructed, a uniform trapezoidal channel with a 15 -foot bottom, 3H:1 V side <br />slopes, and minimum depth of 4 feet will be employed. <br />Exh. 7-14E-2 Revision Date: 08/22/15 <br />Revision No.: TR -105 <br />
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