2009-06-30_REVISION - M1981302

• Permit No: M1981302
• IBM Index Class Name: Revision
• Doc Date: 6/30/2009
• Doc Name: As-Built Drawings of Perimeter Levee- Signed Levee Report.
• From: The Regents of Univ. of Colorado
• To: DRMS
• Type & Sequence: TR8
• Media Type: D
• Archive: No

VII. LEVEE PROFILES AND CROSS SECTIONS
Report in Support of the Recertification of the
University of Colorado's Flood Control Levee
Page 9
Table 2- Summary of Levee's Ability
to Satisfy FEMA's Criteria for Recognition of Levees
* Solid ground is naturally occurring ground which is outside the 100 -year base flood plain.
** There is an opening for an irrigation ditch. It has been provided with an appropriate closure device.
* ** FEMA's resistance -to- erosion criterion is not actually applicable in this reach, because the base flood is
controlled by the naturally occurring land mass, and not by the Levee itself.
VII.1. Profiles
An initial profile of the Levee was prepared by LRE based on Boulder's one -foot contour map.
This was compared to the 1 -D and 2 -D flood profiles from the hydraulic analyses. See Figures
15 (overall Levee) and 16 (the downstream "overtopped" reach). The one -foot topography is
used in Boulder's current flood -plain delineations, and it forms the basis for the four -meter
digital elevation model (DEM) that is part of Boulder's 2 -D hydraulic model. Figure 15
illustrates why the Levee was divided into three reaches. The upstream and downstream reaches
© Leonard Rice Engineers, Inc. June 2009 — 207FIP05
FEMA Criterion and Paragraph
Reference from 44 CFR 65.10
Upstream
Reach
Middle Reach (a)
Downstream Reach
State Agency
Ownership
(a)
Yes
Yes
Yes
Ties to Solid Ground
at Each End *
Yes
No
No
3W Min Freeboard
at U/S End
(b)(1)
Yes
NA
NA
3' Min Freeboard-
Remainder of Levee
(b)(1).
Yes
Yes (b)
No
Openings Provided
with Closure Devices
(b)(2)
Yes **
None
None
Adequate Erosion
Protection
(b)(3)
Yes
NA * **
Not Analyzed
Satisfactory Strength /
Stability
(b)(4)
Yes
Not Analyzed
Not Analyzed
Satisfactory
Resistance to Seepage
(b)(4)
Yes
Not Analyzed
Not Analyzed
Resistance to Settling
(b)(5)
Yes
Not Analyzed
Not Analyzed
No Trees or Brush on
Face
Yes
N
No
Interior Drainage
Handled
(b)(6)
Yes
Yes
Yes
Operation Plan in
Effect
(c)
Yes
No
No
Maintenance Plan in
Effect
(d)
Yes
No
No
VII. LEVEE PROFILES AND CROSS SECTIONS
Report in Support of the Recertification of the
University of Colorado's Flood Control Levee
Page 9
Table 2- Summary of Levee's Ability
to Satisfy FEMA's Criteria for Recognition of Levees
* Solid ground is naturally occurring ground which is outside the 100 -year base flood plain.
** There is an opening for an irrigation ditch. It has been provided with an appropriate closure device.
* ** FEMA's resistance -to- erosion criterion is not actually applicable in this reach, because the base flood is
controlled by the naturally occurring land mass, and not by the Levee itself.
VII.1. Profiles
An initial profile of the Levee was prepared by LRE based on Boulder's one -foot contour map.
This was compared to the 1 -D and 2 -D flood profiles from the hydraulic analyses. See Figures
15 (overall Levee) and 16 (the downstream "overtopped" reach). The one -foot topography is
used in Boulder's current flood -plain delineations, and it forms the basis for the four -meter
digital elevation model (DEM) that is part of Boulder's 2 -D hydraulic model. Figure 15
illustrates why the Levee was divided into three reaches. The upstream and downstream reaches
© Leonard Rice Engineers, Inc. June 2009 — 207FIP05