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GLENWOOD SPRINGS 118 West Sixth St, Suite 200 | Glenwood Springs, CO 81601 | 970.945.1004
Page | 1
May 24, 2024
Mr. Dave Reynolds, Town Administrator
Garfield County Community Development
108 8th Street, Suite 401
Glenwood Springs, Colorado 81601
RE: Grand Hogback Ranches, Lots 17 and 18
Review of Drainage Report and Civil Plans
Final Technical Review Approval
Dear Dave,
The purpose of this letter is to provide our technical concurrence per our review of data prepared by High Country
Engineering for the Drainage Report and Civil Plans in support of the watershed permit application and the Access
permit application to the Town of New Castle. We provided a number of comments and concerns in our letter of
May 24, 2024 by which the applicant and his engineer have addressed to our satisfaction.
You will find attached the following information:
a. Construction Drawings for Tract 17 & 18 – Final Plans dated 8-23-24 as prepared by High Country
Engineering
b. The 8-8-2024 Drainage Report prepared by High Country Engineering
c. The email from Tom Scott to myself regarding the existing 30” culvert capacity
d. The email from Tom Scott to myself regarding the existing 24” culvert capacity
From the Town’s standpoint, we recommend issuance of the Watershed Permit as well as the Access Permit for
this project. As well, we would recommend forwarding this letter to the County Planning Department indicating
our concurrence with the project unless other staff members have any additional issues that need to be
communicated to and addressed by the applicant.
Upon receipt and review of this letter if you have any questions, please don’t hesitate to contact me.
Respectfully,
SGM
Jefferey S. Simonson, PE
Principal/Town Engineer
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COLORADO RIVER ROAD CR 335
COLORADO RIVER ROAD CR 335TRACTS 17 AND 18
ORF
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1
DRAINAGE REPORT
FOR
TRACTS 17 AND 18, GRAND HOGBACK RANCHES
NEW CASTLE, GARFIELD COUNTY, COLORADO
Access permit application
Applicant:
Belodi Creek Ranch, LLC
Prepared by:
High Country Engineering, Inc.
1517 Blake Avenue, Suite 101
Glenwood Springs, CO 81601
(970) 945-8676
For and on Behalf of
High Country Engineering, Inc.
HCE Project No. 2231025.00
March 15, 2024
Revised: May 14, 2024
Revised: August 8, 2024
2
TABLE OF CONTENTS
SECTION PAGE
I. PURPOSE .......................................................................................................................... 3
II. LOCATION ....................................................................................................................... 3
III. EXISTING CONDITIONS .............................................................................................. 3
IV. PROPOSED CONDITIONS ............................................................................................ 3
V. SUMMARY ....................................................................................................................... 5
VI. REFERENCES .................................................................................................................. 5
APPENDIX A: Hydrologic calculations
APPENDIX B: Storm water storage
APPENDIX C: Hydraulic calculations
APPENDIX D: Exhibits
3
I. PURPOSE
The purpose of this report is to address storm water drainage associated with the proposed grading and driveway
entrance improvements, situated within Tracts 16 and 17 of the Grand Hogback Ranches, at County Road 335
(Colorado River Road).
II. LOCATION
An existing driveway entrance is roughly centered between Tracts 16 and 17 of the Grand Hogback Ranches,
opposite of existing Park Drive to the north.
III. EXISTING CONDITIONS
According to the Soil Survey of Rifle Area, Colorado, parts of Garfield and Mesa Counties, published by the
United States Department of Agriculture, in cooperation with the Soil Conservation Service, the soil at the site is
primarily Soil Type 51 – Olney Loam. This soil is formed in alluvium derived from sandstone and shale. The
surface layer is generally about 12 inches thick. The sub surface layer is generally about 21 inches thick. The sub
stratum is generally about 60 inches thick. Permeability is moderate. Available water capacity is moderate.
Surface runoff is medium. The erosion hazard is moderate. This soil type is categorized as being within
hydrologic soil group B.
According Inter-Mountain Engineering Ltd. Letter Re: River Side Village PUD / River Park, dated: December 6,
2004, the runoff coefficient of the soils is: 73.
Tracts 17 and 18 are currently undeveloped. The northerly portions are generally or are sparsely vegetation. The
southerly regions to the Tracts have out crops, and vegetation, mainly comprised of native trees, shrubs and
grasses.
Existing storm water runoff generally sheet flows across the site from the South downward towards the North.
Runoff is intercepted by existing roadside ditches along County Road 335 (Colorado River Road).
The intercepted runoff then passes beneath County Road 335 via existing culverts leading towards the River Park
neighborhood, and eventually to the Colorado River to the north.
IV. PROPOSED CONDITIONS
The Applicant, Belodi Creek Ranch, LLC, intends to make the following improvements:
Expand the limits of the existing driveway entrance, in order to accommodate turning movements of
entering and exiting agricultural vehicles
Remove an existing 18-inch culvert at the driveway entrance
Install new 18-inch diameter storm drainage culverts at the existing driveway entrance to accommodate
existing roadside drainage
Grade a new storm water retention basin near the northeast corner of Tract 17, to retain the increased
tributary developed 25-year runoff volume
4
Grade a new storm water retention basin near the northwest corner of Tract 18 to retain the increased
tributary developed 100-year runoff volume
Improve the existing private access road leading to Tracts 17 and 18 to accommodate agricultural vehicles
Grade shallow roadside ditches alongside the improved private access road
Grade a single flat pad within the northerly potions of Tracts 17 and 18, to be utilized for agricultural
storage use. The proposed surface of graded areas flat pad is to be overlaid with gravel asphalt millings
According to Table 2-2a of Urban Hydrology for Small Watersheds Technical Release 55: hydrologic type B
soils that are overlaid with gravel has a curve number of 85.
Since the proposed surfacing of the proposed flat pad is to be overlaid with gravel asphalt millings, an increase
in surface runoff is anticipated. Therefore, two (2) storm water retention basins, to accommodate the increased
25-year runoff volume are proposed.
Tracts 17 and 18 have been analyzed as two (2) watershed basins, under historic and proposed conditions. The
peak runoff rates for the basin has been calculated using Soil Conservation Service (SCS) TR-55 Method. A
summary for the site peak runoff rates are summarized below in Table 1.
According to SGM Letter Re: Grand Hogback Ranches Lots 17 and 18, dated May 24, 2024, maximum
allowable runoff rates for the project are as follows:
Existing 30” culvert adjacent to west side of site:
25-year: 17.93 cfs
100-year: 32.49 cfs
Maximum: 35.86 cfs
Existing 24” culvert adjacent to east site of site:
25-year: 7.91 cfs
100-year: 14.27
Maximum: 15.88
Table 1. Basin Watershed Runoff Summary
Site
Condition
Basin
(ID)
Area
(ac.)
Composite
Curve Number
Time Conc.
(Hr.)
Q25
(c.f.s.)
Q100
(c.f.s.)
Pre-Developed HI-1W 30.00 73 0.22 9.0 15.7
Pre-Developed HI-1E 28.83 73 0.31 6.5 11.4
Pre-Developed HI-1W & HI-1E 50.83 73 0.22 17.9 32.5
Proposed PR-1W 30.00 73 0.22 9.2 16.0
Proposed PR-1E 28.83 74 0.25 6.7 14.8
Proposed PR-1W& PR-1E 50.83 74 0.22 20.2 35.6
The required 100-year storage volumes have been calculated for Tracts 17 and 18, based upon Soil Conservation
Service (SCS) TR-55 Graphical Method, as summarized below in Table 2.
5
The proposed 100-year storage volumes have also been calculated based proposed grading shown on the attached
exhibits, using the average end method and comparisons were made, as summarized in Table 2 below.
The proposed storage basis have been sized to release rates the following allowable release rates of
Basin PR-1W: Existing 30” culvert adjacent to west side of site: 100-year: 32.49 cfs
Basin PR-1E: Existing 24” culvert adjacent to east site of site: 100-year: 14.27
Table 2. Proposed 100-year Storage Volume Summary
Site
Condition
Basin
(ID)
Required 100-Yr
Volume (ac.-ft.)
Proposed 100-Yr
Volume (ac.-ft.)
Adequate 100-Yr
Storage capacity?
Proposed PR-1W 0.024 0.086 Yes
Proposed PR-1E 0.020 0.252 Yes
Since the proposed 100-year storage volumes, exceed the required 100-year storage volumes, the proposed storage
volumes will have adequate storage capacity.
V. SUMMARY
The applicant intends to overlay surfaces the proposed graded pad with gravel asphalt millings. Therefore, an
increase in surface runoff is anticipated. In accordance with Town of New Castle standards, the applicant
proposes to construct two (2) storm water retention basins, to accommodate the increased 100-year runoff
volumes.
The two (2) proposed storm water retention basins are also intended to intercept and sequester any sediments or
waterborne pollutants, to provide water quality and thereby protect the aquatic habitat of the Colorado River to
the north.
VI. REFERENCES
1. Soil Survey of New Castle Area, Colorado, U.S. Department of Agriculture, Soil Conservation Service,
May 1985
2. Urban Hydrology for Small Watersheds Technical Release 55 (TR-55),United States Department of
Agriculture, Natural Resources Conservation Service, Soil Conservation Service, 1986
3. Precipitation –Frequency Atlas of the Western United States, Volume III-Colorado, National Oceanic and
Atmospheric Administration, 1973
4. Letter Re: River Side Village PUD / River Park, Inter-Mountain Engineering Ltd. December 6, 2004
5. Letter Re: Grand Hogback Ranches Lots 17 and 18, SGM, dated May 24, 2024
APPENDIX A
Hydrologic Calculations
APPENDIX B
Storm water storage
APPENDIX C
Hydraulic Capacity Calculations
scale:
page:
Project No:
drawn by:
checked by:
date:
file:
HIGH COUNTRY ENGINEERING, INC.
14 INVERNESS DRIVE EAST, STE F-120, ENGLEWOOD, CO 80112
PHONE (303) 925-0544 FAX (303) 925-0547
1517 BLAKE AVENUE, STE 101, GLENWOOD SPRINGS, CO 81601
PHONE (970) 945-8676 FAX (970) 945-2555
www.hceng.com
Belodi Creek Ranch LLC
Garfield County, CO.
TRACTS 17 AND 18
HYDRAULIC CAPACITIES
HCE
HCE
8 - 8 - 24
C - 01.DWG
N.T.S.
2231025.00
APPENDIX C 1
APPENDIX D
Exhibits
scale:
page:
Project No:
drawn by:
checked by:
date:
file:
HIGH COUNTRY ENGINEERING, INC.
1517 BLAKE AVENUE, STE 101,
GLENWOOD SPRINGS, CO 81601
PHONE (970) 945-8676 FAX (970) 945-2555
www.hceng.com 1
2231025.00
1" = 1,000'
EX-01.dwg
03-15-24
HCE
HCE
VICINITY MAP
GRAND HOGBACK RANCHES
TRACTS 17 AND 18
GARFIELD COUNTY, COLO.
BELODI CREEK RANCH, LLC
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