|(a) 1.0% annual chance
flood event - Flood event having a 1.0% chance of being equaled or
exceeded in any given year, also referred to as the base flood or
(b) 0.2% annual chance
flood event - Flood event having a 0.2% chance of being equaled or
exceeded in any given year, also referred to as the 500-year flood.
(c) Board - the governing
body of the Texas Water Development Board.
(d) Executive Administrator
(EA) - The Executive Administrator of the TWDB or a designated representative.
(e) FEMA - Federal Emergency
(f) FIRM - Flood Insurance
(g) Flood - A general
and temporary condition of partial or complete inundation of normally
dry land area from overflow of inland or tidal waters or from the
unusual and rapid accumulation or runoff of surface waters from any
(h) Flood-prone - Areas
with known risk of flooding primarily during storm events either from
existing inundation maps, studies, and/or historic knowledge of flood
events. Flood-prone areas may include, but are not limited to, the
floodplain, the floodway, the flood fringe, wetlands, riparian buffers,
or other areas adjacent to the main channel.
(i) Floodplain - That
area of land subject to periodic inundation by floodwaters.
(j) Floodplain management
- The operation of an overall program of corrective and preventative
measures for reducing flood damage.
(k) Flood Mitigation
- The implementation of actions, including both structural and non-structural
solutions, to reduce flood risk to protect against the loss of life
(l) Flood Management
Evaluation (FME) - A proposed flood study of a specific, flood-prone
area that is needed in order to assess flood risk and/or determine
whether there are potentially feasible FMSs or FMPs.
(m) Flood Management
Strategy (FMS) - A proposed plan to reduce flood risk or mitigate
flood hazards to life or property. A flood management strategy may
or may not require associated Flood Mitigation Projects to be implemented.
(n) Flood Mitigation
Project (FMP) - A proposed project, both structural and non-structural,
that has a non-zero capital costs or other non-recurring cost and
that when implemented will reduce flood risk, mitigate flood hazards
to life or property.
(o) Flood Planning Region
(FPR) - A geographic area designated by the Board pursuant to Texas
Water Code §16.062.
(p) Flood Risk - Generally
describes the hazard from flood events to life and property, including
the likelihood of a hazard occurring; the magnitude of the hazard;
the number of people and properties exposed to the hazard; and the
vulnerability of the people and properties exposed to the hazard.
(q) Flood Risk Map -
A map that shows flood risk for Texas communities at some level of
detail using best available data.
(r) GIS - Geographic
(s) GLO - General Land
(t) HUC - Hydrologic
Unit Code level (e.g., HUC8) as delineated by the United States Geological
(u) Hydrologic and Hydraulic
Model - Mathematical model created utilizing computer software that
simulates rainfall runoff flow to estimate the extent of water levels
and flooding and to test potential ways to reduce flood risk.
(v) Nature-based flood
mitigation - Mitigation approaches involving the use of natural features,
materials, and processes to reduce the risk and impacts of flooding.
(w) Neighboring area
- means any area, including but not limited to upstream and downstream
areas, potentially affected by the proposed FMP.
(x) Negative Effect -
An increase in flood-related risks to life and property, either upstream
or downstream of the proposed project. The RFPG may adopt a standard
that is more restrictive than the standard provided in TWDB guidance.
(y) Planning Group Sponsor
- A political subdivision designated by the Regional Flood Planning
Group as authorized to receive funds for developing or revising regional
(z) Political Subdivision
- County, city, or other body politic or corporate of the state, including
any district or authority created under Art. 3 § 52 or Art. 16 §
59 of the constitution and including any interstate compact commission
to which the state is a party and any nonprofit Water Supply Corporation
created and operating under Ch. 67.
(aa) Potentially feasible
flood management strategy or potentially feasible flood mitigation
project - a FMS or FMP that is permittable, constructible, economically
viable, and implementable.
(bb) Regional Flood Plan
(RFP) - The plan adopted or amended by a Regional Flood Planning Group
pursuant to Texas Water Code §16.062 (relating to Regional Flood
Plans) and this
(cc) Regional Flood Planning
Group (RFPG) - A group designated by the Board that develops a Regional
Flood Plan, pursuant to Texas Water Code §16.062.
(dd) Residual Risk -
The remaining flood risk in an area after the completion of a FMS
or FMP or set of FMSs or FMPs that reduce flood risk in that same
(ee) State Flood Plan
(SFP) - The most recent State Flood Plan adopted or amended by the
Board under Texas Water Code §16.061 (relating to State Flood
(ff) State Flood Planning
Database - A database to be developed and maintained by the TWDB that
stores data related to Flood Planning. It is used to collect, analyze,
and disseminate regional and statewide Flood Planning data.
(gg) State Population
Projections - Population projections contained in the most recently
adopted State Water Plan as further assembled geographically based
on HUC 8 watersheds or other appropriate flood-related geographic
features determined by the TWDB.
(hh) TWC - Texas Water
(ii) TWDB - Texas Water