EP 1110-2-9
31 Jul 94
Chapter 3
funding and scheduling required for the feasibility-phase
investigation. An initial HEMP would normally be pre-
Scoping the Investigation
pared at the end of the reconnaissance phase. Any com-
plex or unusual technical hydrologic issues should be
discussed at the technical review conference (TRC)
3-1. General
required at the end of reconnaissance and included in the
plan. An example of an initial hydrologic engineering
A preliminary assessment should be made to gain an
management plan for a local protection project is shown
understanding of the key issues and concerns to be
in Appendix C.
addressed in the analysis. This assessment leads to an
initial hydrologic engineering management plan, based on
b. Feasibility-phase study.
the main considerations of the study.
(1) Detailed HEMP. As soon as feasibility funding
3-2. Study Objective
is received, the initial HEMP of the reconnaissance phase
may be expanded to detail the hydrologic engineering
The major study objectives should be defined; flood dam-
activities for week-to-week use by the hydrologic engineer
age reduction, navigation, water supply, environmental
throughout the study. Technical studies are detailed so
restoration, water control, hydropower, etc. Geographic
that work activity durations may be established, milestone
scope of the study should be determined and key locations
dates set, etc. Examples of detailed HEMP's are shown
requiring hydrologic information specified. Preliminary
in Appendices D, E, and F. This phase results in a feasi-
hydrologic engineering requirements and strategies to
bility report with a series of engineering appendices. The
accomplish these objectives may be postulated.
appendices are in sufficient detail to allow the work effort
to generally proceed directly to the design memorandum
3-3. Type of Study
phase.
The type of study requires different levels of hydrologic
(2) Project management plan. A project manage-
planning, ranging from very little to extensive. The vari-
ment plan is prepared at the end of the feasibility-phase
ous studies for which a HEMP may be developed are
study, assuming an economically justified project is rec-
described in the following paragraphs, with reconnais-
ommended and a cost-sharing partner exists. It requires
sance, feasibility, and preconstruction engineering and
sufficient hydrologic engineering detail to scope, cost, and
design comprising the usual path for most Corps studies.
schedule the activities for the balance of preconstruction
engineering and design. The PMP forms the basis for the
a. Reconnaissance-phase study.
project cooperation agreement (PCA) with the sponsor, to
complete the detailed design and construct the project.
(1) Initial HEMP. An initial HEMP should be pre-
The major hydrologic engineering activities for PED must
pared to provide a cost estimate for the reconnaissance
be identified and cost estimates made for the project man-
phase, which is 100 percent Federally funded. However,
agement plan. Figure 1 illustrates this phase.
reconnaissance funds are usually obtained in advance of
hydrologic engineering planning, as this phase emphasizes
c. Preconstruction engineering and design. The
the use of existing studies and data to perform the hydro-
PED phase concentrates on the detailed design of the
logic analysis. For this situation, a HEMP may be pre-
project. It would normally be expected to consist of one
pared and used as an internal document. If time and
or more design documents and plans and specifications to
funding permit, establishing the without-project hydrology
construct the project.
and hydraulics for the existing condition of the watershed
is desirable.
(1) Design memoranda. The project should move
directly from the feasibility phase to PED, with a design
(2) IPMP. An IPMP is the end result of a successful
memorandum (DM) to establish the detailed technical
reconnaissance-phase study, which must include adequate
design necessary to construct the project. Consequently, a
technical hydrologic engineering information to success-
detailed HEMP would be prepared at the start of PED to
fully complete a feasibility cost-sharing agreement
outline the balance of the technical hydrologic engineering
(FCSA) with the sponsor. The hydrologic engineering
effort. This detailed HEMP would build on the initial
management plan must identify the major technical activi-
hydrologic engineering management plan prepared for the
ties and establish time and cost estimates. The estimates
PMP. PED hydrologic activities often include physical
are used in the initial project management plan to develop
3-1
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