EP 1110-2-9
31 Jul 94
Appendix D
(4) Obtain hydrologic (historic and design dis-
charges, discharge-frequency relationships, etc.) and
Generic Detailed Hydrologic Engineering
hydraulic (high-water marks, bridge designs, cross sec-
Management Plan (HEMP) for a Flood
tions, etc.) data.
Damage Reduction Study
(a) Local agencies (city/county highway depart-
ments, land use planning, etc.).
D-1. General
(b) State (state highway departments, planning agen-
This sample detailed HEMP would be appropriate for the
cies, water resource agencies, etc.).
hydrologic and hydraulic analysis associated with a typi-
cal Corps feasibility report for an urban watershed. It
(c) Federal U.S. Geological Survey (USGS),
would be prepared at the end of reconnaissance-phase
U.S. Soil Conservation Service (SCS), U.S. Bureau of
study or start of the feasibility phase. The intent of the
Reclamation (USBR), etc.
hydrologic engineering analysis would be to determine
existing and future discharge-frequency and stage-
(d) Railroads.
discharge relationships at key points in the study area,
along with flooded area maps by frequency. This analysis
(e) Industries.
would be performed without project and for various flood
reduction components that are considered feasible for
(f) Other.
relief of the flood problem.
(5) Scope major hydrologic and hydraulic activities.
D-2. Preliminary Investigations
(6) Prepare detailed HEMP.
This initial phase includes a literature review of previous
reports, obtaining the available data, and requesting addi-
(7) Obtain study area maps.
tional information needed to perform the investigation.
(a) County highway maps.
a. Initial preparation.
(b) USGS topographic quadrangle maps.
(1) Confer with the other disciplines involved in the
study to determine the objectives, the hydrologic engineer-
(c) Aerial photographs.
ing information requirements of the study for other disci-
plines, study constraints, etc.
(d) Others.
(2) Scope study objectives and purpose.
(8) Estimate location of cross sections on maps
(floodplain contractions, expansions, bridges, etc). Deter-
(3) Review available documents.
mine mapping requirements (orthophoto) in conjunction
with other disciplines.
(a) U.S. Geological Survey reports.
b. Field reconnaissance.
(b) Previous Corps work.
(1) Interview local agencies, and residents along the
(c) Local studies.
stream, review newspaper files, etc., for historic flood
data (high-water marks, frequency of road overtopping,
(d) Hydrologic engineering analysis for reconnais-
direction of flow, land use changes, stream changes, etc.).
sance report.
Document names, locations, and other data for future
reference.
(e) Initial Project Management Plan.
(2) Finalize cross-section locations/mapping
(f) Other.
requirements.
D-1
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