U.S. Dept. of Homeland Security FEMA - PAL Agreement (Levee)
Letter of Agreement and Request for ProvisionaUy Accredited Le,ee (PAL) Designation and Agreement to
Provide Adequate Compliance with the Code of Federal Regulations, Title 44, Section 65.10 (44 CFR 65.10)
PAL Al!reement Form
We, the undersigned, have received a letter from FEMA dated May I, 2007 with an enclosed "Levee Status Map"
and "Levee Status Table" and two enclosed documents titled ''Title 44 olthe Code of Federal Regulations (CFR),
Section 65,10 (44 CFR 65, 10)" and "Requirement,~ 0/,44 CPR Section 65,10: Mapping ol Areas Protected by Levee
S:vstems " We understand that FEMA is in the process of providing an updated Flood Insurance Rate Map for Santa
Clara County, CA and that the flood hazards around levee(s) identified on the Levee Status Map and Levee Swws
Table with ID numbers P il_, P __~, P ___, P ___,_, P _~~_~ will be remapped to reflect that these levees have
been designated a PAL This/these levee(s) or levee system(s) is/are also known as rTVAS,_C'REB~
To the best of our knowledge, the levee(s) identified above meet the criteria of 44 CFR 65,10 and haS/have been
maintained in accordance with an adopted operation and maintenance plan, For Scenario A (non-USACE Program)
levees, this must be evidenced by an attached Operation and Maintenance Plan and records of levee maintenance
and operation, as well as Test Records of Mechanized Interior Drainage System, We hereby submit to FEMA
within 90 days (before August 2, 2007) our agreement to provide FEMA with all the necessary information to
show that the levec(s) identified above comply with 44 CFR 65.10 We understand that this documentation will be
provided before August 2, 2009. Providing the inlormation des..:ribed in 44 CFR 6510 WIll allow FEMA to move
forward with the flood mapping for Santa Clara County We fully understand that if complete documentation of
compliance with 44 CFR 65,10 is not provided within the designated timeframe of 24 months, FEMA will initiah: a
revision to the Flood Insurance Rate Map for Santa Clara County to redesignate the area as floodprone,
C""llI11UllllV ITI) tpri
Date
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Levee Owner Rcpresentatin: (.,Ignatur
I e\ ee Owner RCPI~.!!.::C (pril
Cnmmulllly CI'I) (SI'
DalC July 17, 200!
n;;l~.;';,-i
Iltlh'l
Required Attachments for Scenario A nOIl-l:SACF P~I .nee... onl\:
(}perallnn and rvlaiT11cnan~'c 1'i:111 and Ik"onh
I e,r Re:l'\'I,j.. of \kdul1l/ed Intenoll )ralIUC!.l' S', ,1:11'
1-;.'-(- 07
"Htrudinn... for Cnmpletin~ thi... FOfm:
On thl:' P'\L At'recllle>llt F;lI1l1, lillln the: Ie,,:e III numhers ;Hld k\,','1 ! ILHlh,' dcs,:nptll\ll fur \\hich lhc
I'r,'\'hHlnallv Ae\.T~dil,'d [C\C,' (f'\! ) dc:st;,!I\.ltJ<i1l I I ('que"ll'd\ ';q',n:lk I' \1 .\grc,'ll,,:nt Flll1l1 is
t,'C('I1H1h,'l1tkd fpI c':l\.'h UlllqU,' k\,'l' U\\ fL'1 k\ ce '>\ .',,'t\1 \Llkc'." 'Ph,'. ,lit,; hLmk jl.'nl110 requcst PAl
dC>I\!l1at;"ll ,-(11 flluilil'k I('\c'c ,S\>tc:lIh, ,h IiCc',',;;ll\
II~ rl""lllliCI1' I', J\ Jlbhic "mline {"I ,1 1'1 ll' 1.'l1l!I' 'I1.l1 III f',' :ill,'du. "l<filc,dh! -, u the 11Ilk [l,UI1,'d
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U.S. Department of Homeland Security
1111 Broadway, Suite 1200
Oakland, CA, 94607-4052
FEMA
October 10, 2007
The Honorable Al Pinhiero, Mayor
City of Gilroy
7351 Rosanna Street
Gilroy, CA 95020
Dear Mayor Pinhiero:
This letter is concerning the levee listed below, which is also identified on the enclosed
Levee Status table.
. Levee with ID # PO, along Uvas Creek
The flood hazard information presented on the effective Flood Insurance Rate Map (FIRM)
and in the effective Flood Insurance Study (FIS) report for the City of Gilroy, California is
based, in some areas, on flood protection provided by this levee. Based on the information
available and on the mapping standards of the National Flood Insurance Program (NFIP) at
the time that the FIS was performed, FEMA accredited the levee with providing protection
from the flood that has a l-percent-chance of being equaled or exceeded in any given year.
This l-percent-annual-chance flood is referred to as the base flood.
The Department of Homeland Security's, Federal Emergency Management Agency
(FEMA) is currently in the process of producing a countywide FIS report and Digital Flood
Insurance Rate Map (DFIRM) for Santa Clara County, California. Providing communities
with up-to-date, accurate, and reliable flood hazard information on DFIRMs is one of the
primary goals of FEMA' s Map Modernization program. As part of this process, FEMA
sent you a letter dated Mayl, 2007, to provide you the opportunity to receive a
Provisionally Accredited Levee (PAL) designation for this levee. FEMA received your July
24, 2007, signed PAL agreement (enclosed) for this levee. Based on your response, your
signed PAL agreement is acceptable.
The 2-year PAL period for this levee started on August 2, 2007. FEMA will designate this
levee as a PAL on the new countywide DFIRM for Santa Clara County during the 2-year
PAL period to convey to map users that formal levee certification verification is underway.
FEMA recommends that levee owners and community officials undertake outreach efforts
to inform affected property owners that this verification process is underway. FEMA also
encourages the purchase of flood insurance for the area landward of the levee, even though
coverage is not federally required.
All the necessary documentation to show that this levee meets the criteria of the Code of
Federal Regulations, Title 44, Section 65.10 (44 CFR 65.10) must be provided by the end
Mayor Al Pinhiero
Page 2 of 2
of the 2- year PAL period. If you are unable to submit documentation by this deadline or if
the submitted documentation are determined to be inadequate, FEMA will initiate a map
revision to re-designate certain areas on the landward side of the levees as floodprone.
Certification by a Registered Professional Engineer must accompany the submitted 44 CFR
65.10 data. As an alternative, USACE may also certify that the levee has been adequately
designed and constructed to provide protection against the base flood. You must submit a
progress report to FEMA within 1 year of the start of the 2- year PAL period to document
progress toward obtaining data and documentation to comply with 44 CFR 65.10.
Key milestones and dates are provided in the table below.
Date Milestone
05/01/2007 Date of FEMA PAL offer letter
07/24/2007 Date that community/levee owner signed the PAL Agreement
08/02/2007 90-day deadline of PAL offer period and start date of 2-year PAL period
08/02/2008 I-year deadline for submitting progress report to FEMA
08/02/2009 2-year deadline for submitting all 44 CFR 65.10 data to FEMA
If you have questions or need additional information regarding flood mapping, please
contact Eric Simmons, Map Modernization Regional Engineer, by telephone at (510) 627-
7029.
Sincerely,
~
Sally Ziolkow , Director
Mitigation Division
Enclosures:
· Requirements of 44 CFR Section 65.10: Mapping of Areas Protected by Levee
Systems
· Signed PAL agreement
· Levee Status table
cc: Jay Baska, City of Gilroy, City Administrator
Wendie Rooney, City of Gilroy, Floodplain Administrator
Stanley M. Williams, Santa Clara Valley Water District, CEO
Ann Draper, Santa Clara Valley Water District, Assistant Operations Officer
Ricardo Pineda, CA DWR, NFIP State Coordinator
Jennifer Dunn, US ACE, San Francisco District
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As part of a mapping project, it is the levee owner's or community's responsibility to provide data and documentation to
show that a levee meets the requirements of Section 65,10 of the National Flood Insurance Program (NFIP) regulations,
Links to Section 65,10 and many other documents are available on FEMA's Web site at
www,fema,gov!Dlan!prevcnt/fbm/lv fpm,shtm,
The FEMA requirements in Section 65, 10 are separated into five categories:
1. General criteria;
2, Design criteria;
3, Operations plans and criteria;
4, Maintenance plans and criteria; and
5, Certification requirements,
The requirements for each of these areas are summarized below,
(A) GENERAL CRITERIA
For purposes of the NFIP, FEMA will only recognize in its flood hazard and risk mapping effort those levee systems that
meet, and continue to meet, minimum design, operation, and maintenance standards that are consistent with the level of
protection sought through the comprehensive floodplain management criteria established by Section 60,3 of the NFIP
regulations, Section 65.10 of the NFIP regulations describes the types of information FEMA needs to recognize, on NFIP
maps, that a levee system provides protection from the flood that has a I-percent chance of being equaled or exceeded in
any give year (base flood), This information must be supplied to FEMA by the community or other party seeking
recognition of a levee system at the time a study or restudy is conducted, when a map revision under the provisions of Part
65 of the NFIP regulations is sought based on a levee system, and upon request by the Administrator during the review of
previously recognized structures. The FEMA review is for the sole purpose of establishing appropriate risk zone
determinations for NFIP maps and does not constitute a determination by FEMA as to how a structure or system will
perform in a flood event.
(B) DESIGN CRITERL4
For the purposes of the NFIP, FEMA has established levee design criteria for freeboard, closures, embankment protection,
embankment and foundation stability, settlement, interior drainage, and other design criteria, These criteria are
summarized in subsections below,
(B)(l) ~'REEBOARD
For riverine levees:
. A minimum freeboard of 3 feet above the water-surface level of the base flood must be provided.
. An additional 1 foot above the minimum is required within 100 feet on either side of structures (e,g" bridges)
riverward of the levee or wherever the flow is constricted,
March 2007
PAGE 1
FEMA
· An additional 0,5 foot above the minimum at the upstream end of the levee, tapering to not less than the minimum
at the downstream end of the levee, is also required,
Exceptions to the minimum riverine freeboard requirements above may be approved if the following criteria are met:
· Appropriate engineering analyses demonstrating adequate protection with a lesser freeboard must be
submitted,
· The material presented must evaluate the uncertainty in the estimated base flood elevation profile and include,
but not necessarily be limited to:
o An assessment of statistical confidence limits of the I-percent-annual-chance discharge;
o Changes in stage-discharge relationships; and
o Sources, potential, and magnitude of debris, sediment, and ice accumulation,
· It must be also shown that the levee will remain structurally stable during the base flood when such additional
loading considerations are imposed,
Under no circumstances will freeboard of less than 2 feet be accepted,
For coastal levees, the freeboard must be established at 1 foot above the height of the I-percent-annual-chance wave or
the maximum wave runup (whichever is greater) associated with the I-percent-annual-chance stillwater surge elevation at
the site,
Exceptions to the minimum coastal freeboard requirements above may be approved if the following criteria are met:
· Appropriate engineering analyses demonstrating adequate protection with a lesser freeboard must be
submitted,
· The material presented must evaluate the uncertainty in the estimated base flood loading conditions,
Particular emphasis must be placed on the effects of wave attack and overtopping on the stability of the levee,
Under no circumstances will a freeboard of less than 2 feet above the I-percent-annual-chance stillwater surge elevation
be accepted,
(B)(2) CLOSURES
The levee closure requirement is that all openings must be provided with closure devices that are structural parts of the
system during operation and design according to sound engineering practice,
(B)(3) EMBANKMENT PROTECTION
Engineering analyses must be submitted to demonstrate that no appreciable erosion of the levee embankment can be
expected during the base flood, as a result of either currents or waves, and that anticipated erosion will not result in failure
of the levee embankment or foundation directly or indirectly through reduction of the seepage path and subsequent
instability,
The factors to be addressed in such analyses include, but are not limited to:
· Expected flow velocities (especially in constricted areas);
. Expected wind and wave action;
March 2007
PAGE 2
. Ice loading;
. Impact of debris;
. Slope protection techniques;
. Duration of flooding at various stages and velocities;
. Embankment and foundation materials;
. Levee alignment, bends, and transitions; and
. Levee side slopes,
(B)(4) EMBANKl\IENT AND F'OLJNDATION STABILITY
Engineering analyses that evaluate levee embankment stability must be submitted,
The analyses provided shall evaluate expected seepage during loading conditions associated with the base flood and shall
demonstrate that seepage into or through the levee foundation and embankment will not jeopardize embankment or
foundation stability,
An alternative analysis demonstrating that the levee is designed and constructed for stability against loading conditions for
Case IV as defined in U.S. Army Corps of Engineers (USACE) Engineering Manual 1110-2-1913, Chapter 6, Section II,
may be used,
The factors that shall be addressed in the analyses include:
. Depth of flooding;
. Duration of flooding;
. Embankment geometry and length of seepage path at critical locations;
. Embankment and foundation materials;
. Embankment compaction;
. Penetrations;
. Other design factors affecting seepage (e,g" drainage layers); and
. Other design factors affecting embankment and foundation stability (e,g" berms),
(8)(5) SETTLEMENT
Engineering analyses must be submitted that assess the potential and magnitude of future losses of freeboard as a result of
levee settlement and demonstrate that freeboard will be maintained within the minimum freeboard standards set forth in
B(I),
This analysis must address:
. Embankment loads,
. Compressibility of embankment soils,
. Compressibility of foundation soils,
March 2007
PAGE 3
. Age of the levee system, and
. Construction compaction methods,
A detailed settlement analysis using procedures such as those described in USACE Engineering Manual EM 1100-2-1904
must be submitted,
(B)(6) INTERIOR DRAINAGE
An analysis must be submitted that identifies the source(s) of such flooding; the extent of the flooded area; and, if the
average depth is greater than 1 foot, the water-surface elevation(s) of the base flood, This analysis must be based on the
joint probability of interior and exterior flooding and the capacity of facilities (such as drainage lines and pumps) for
evacuating interior floodwaters, Interior drainage systems usually include storage areas, gravity outlets, pumping stations,
or a combination thereof.
For areas of interior drainage that have average depths greater than 1 foot, mapping must be provided depicting the
extents of the interior flooding, along with supporting documentation,
(B)(7) OTHER DESIGN CRITERIA
In unique situations, such as those where the levee system has relatively high vulnerability, FEMA may require that other
design criteria and analyses be submitted to show that the levees provide adequate protection, In such situations, sound
engineering practice will be the standard on which FEMA will base its determinations, FEMA also will provide the
rationale for requiring this additional information,
(C) OPERATIONS PLANS AND CRITERIA
For a levee system to be recognized, the operational criteria must be as described below, All closure devices or
mechanical systems for internal drainage, whether manual or automatic, must be operated in accordance with an officially
adopted operation manual, a copy of which must be provided to FEMA by the operator when levee or drainage system
recognition is being sought or when the manual for a previously recognized system is revised in any manner, All
operations must be under the jurisdiction of a Federal or State agency, an agency created by Federal or State law, or an
agency of a community participating in the NFIP,
(C)(1) CLOSURES
Operation plans for closures must include the following:
· Documentation of the flood warning system, under the jurisdiction of Federal, State, or community officials, that
will be used to trigger emergency operation activities and demonstration that sufficient flood warning time exists
for the completed operation of all closure structures, including necessary sealing, before floodwaters reach the
base of the closure;
· A formal plan of operation, including specific actions and assignments of responsibility by individual name or
title; and
· Provisions for periodic operation, at not less than I-year intervals, of the closure structure(s) for testing and
training purposes,
March 2007
PAGE 4
(C}(2) INTERIOR DRAINAGE SYSTEMS
Interior drainage systems associated with levee systems usually include storage areas, gravity outlets, pumping stations, or
a combination thereof. FEMA will recognize these drainage systems on NFIP maps for flood protection purposes only if
the following minimum criteria are included in the operation plan:
. Documentation of the flood warning system, under the jurisdiction of Federal, State, or community officials, that
will be used to trigger emergency operation activities and demonstration that sufficient flood warning time exists
to permit activation of mechanized portions of the drainage system;
. A formal plan of operation, including specific actions and assignments of responsibility by individual name or
title;
. Provision for manual backup for the activation of automatic systems; and
. Provisions for periodic inspection of interior drainage systems and periodic operation of any mechanized portions
for testing and training purposes; no more than I year shall elapse between either the inspections or the
operations,
(C}(3) OTHER OPERA nON PLANS AND CRITERIA
FEMA may require other operating plans and criteria to ensure that adequate protection is provided in specific situations,
In such cases, sound emergency management practice will be the standard upon which FEMA determinations will be
based,
(D) ilfAINTENANCE PLANS AND CRITERIA
For levee systems to be recognized as providing protection from the base flood, the following maintenance criteria must
be met:
. Levee systems must be maintained in accordance with an officially adopted maintenance plan, and a copy of this
plan must be provided to FEMA by the owner of the levee system when recognition is being sought or when the
plan for a previously recognized system is revised in any manner.
. All maintenance activities must be under the jurisdiction of a(n):
o Federal or State agency;
o Agency created by Federal or State law; or
o Agency of a community participating in the NFIP that must assume ultimate responsibility for
maintenance,
. The maintenance plan must document the formal procedure that ensures that the stability, height, and overall
integrity of the levee and its associated structures and systems are maintained,
. At a minimum, the maintenance plan shall specify:
o Maintenance activities to be performed;
o Frequency of their performance; and
o Person by name or title responsible for their performance,
March 2007
PAGE 5
(E) CERTIFIC4 TION REQUIREJl.lENTS
Data submitted to support that a given levee system complies with the structural requirements set forth in B(l) through
B(7) above must be certified by a Registered Professional Engineer. Also, certified as-built plans of the levee must be
submitted, Certifications are subject to the definition given in Section 65,2 of the NFIP regulations, In lieu of these
structural requirements, a Federal agency with responsibility for levee design may certifY that the levee has been
adequately designed and constructed to provide protection against the base flood,
March 2007
PAGE 6
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