EP 1110-2-9
31 Jul 94
Appendix F
(d) Studies by other agencies.
Generic Detailed Hydrologic Engineering
b. Choice and application of models.
Management Plan (HEMP) for a Water
Supply Investigation
(1) Research, obtain consultation (HEC and others)
on which models to employ and how they can be applied.
F-1. Sample Detailed HEMP
c. Obtain historic hydrologic/meteorological data.
This sample detailed HEMP can be used as a guide for
(1) Project operating records; e.g., reservoir eleva-
the hydrologic and hydraulic analysis needed for conduct-
tions, outflows.
ing a water conservation or a storage reallocation study.
Examples might include: a water supply allocation plan
(2) U.S. Geological Survey (USGS) streamflow
for a new reservoir project; a drought operating plan for
records.
an existing reservoir project or system of projects; and a
system-wide reevaluation of a master water control plan
(3) National Weather Service (NWS) precipitation
considering the potential of benefit reallocation. The
and temperature data.
analysis would typically employ a reservoir simulation
model such as the Hydrologic Engineering Center
(4) Evaporation records.
(HEC)-5 or HEC- Prescriptive Reservoir Model (PRM).
Flood control criteria might affect conservation purposes;
(5) Snow data.
therefore, flood routing studies may be required, and
perhaps a rainfall-runoff model would be employed. The
(6) Irrigation withdrawals.
goal would be to evaluate nominated alternatives of stor-
age quantities, firm water supply yields, seasonal rule
(7) Consumptive use (municipal and industrial)
curves, and instream flow goals by model simulation.
records.
The alternatives would be judged by comparing regulated
d. Obtain project requirements and alternatives to be
voir elevation-duration curves, etc.
investigated.
F-2. Preliminary Investigations
(1) Municipal and industrial requirements.
This is a preparatory phase that includes scoping the
(2) Instream flow requirements.
project, deciding upon and gathering data, coordinating
with agencies affected by the study, etc. (Experience has
(3) Mandatory reservoir requirements.
shown that more than 50 percent of the study's budget
can be consumed by data gathering and preparation.)
(4) Alternative storage capacities.
a. Initial preparation.
(5) Future irrigation demands.
(1) Identify agencies/parties with which coordination
e. Scope major hydrologic activities; choose models.
is needed - for data, operational requirements.
f. Prepare detailed HEMP.
(2) Identify problem, scope study objectives.
F-3. Develop Hydrologic Data for Analysis
(3) Review existing documents.
a. Load raw data into study database (usually HEC-
(a) Design documents.
Data Storage System (HECDSS)).
(1) Develop naming conventions/database structure.
(b) Interagency agreements.
Ascertain computer requirements. Consult with experts
(c) Previous studies by Corps.
where necessary.
F-1
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