EP 1110-2-9
31 Jul 94
Appendix E
d. Prepare detailed HEMP.
Generic Detailed Hydrologic Engineering
E-3. Develop Study Models
Management Plan (HEMP) for a Water
Control Management Study
Because the water control management study is the final
phase in project development, hydrologic/hydraulic mod-
els will most likely have been developed in previous
E-1. Sample HEMP
phases of the project. If additional modeling studies are
required, then data will have to be obtained and model
This sample HEMP can be used as a guide for hydrologic
calibration undertaken. See Appendices D and F. Note
engineering components of a water control management
that the development of an operational forecast model is
study. This appendix assumes that a general plan for
treated separately, below.
reservoir regulation has been established, which is the
result of a water conservation study (Appendix F), a flood
E-4. Develop Seasonal Flood Control Rule Curve
control study, or new project construction, and that a
water control plan and water control manual are to be
A seasonal guide curve--specifying the upper limit eleva-
developed. The HEMP covers the development of data
tion for flood control throughout the year--may have been
collection procedures, forecasting procedures, drought
developed in earlier study phases; however, this may need
detection procedures, development of reservoir regulation
review and refinement for actual regulation. Also, the
rule curves, and other information. Reference is made to
object of the water management study might be to modify
ER 1110-2-240 and EM 1110-2-3600. Not included in
the existing rule curve to improve regulation or accommo-
this appendix are the hydrologic engineering studies
date a revised policy. This analysis is one of evaluating
needed for a dam safety plan.
flood potential throughout the year. If streamflow records
are short, the analysis could be augmented by looking at
E-2. Preliminary Investigations
precipitation records to ensure that an adequate sampling
of runoff potential for a given calendar date is achieved.
This is a preparatory phase that includes scoping the
project, deciding upon and gathering data, coordinating,
a. Obtain historic flood data for the project site,
etc. (Experience has shown that more than 50 percent of
including secondary floods that occur off-season.
the study's budget can be consumed by data gathering and
preparation.)
(1) Obtain recorder traces from the U.S. Geological
Survey.
a. Do initial preparation/coordination.
(2) Convert traces to streamflow hydrographs.
(1) Identify agencies/parties with which coordination
is needed--for data, operational requirements.
(3) Compute volumes appropriate to flood control
storage.
(2) Review existing documents.
b. Review long-period rainfall and streamflow
(a) Design documents.
records in the region to augment project records. Esti-
mate project inflow data through regional correlation
(b) Interagency agreements.
techniques or, perhaps, a rainfall-runoff model.
(c) Studies by Corps.
(1) Decide on a processing technique (DSSMATH,
STATS, etc.).
(d) Studies by other agencies.
(2) Enter data into database.
(3) Visit existing project(s).
(3) Perform calculations.
b. Obtain hydrologic data--see Appendices D and F.
(4) Display results; verify for reasonableness.
c. Scope major hydrologic activities; choose models
to be used.
(5) Use rainfall-runoff model if required.
E-1
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