The capacity of a reservoir's conservation pool; if the reservoir is
shared with another state or country then conservation capacity refers
only to the portion that belongs to Texas.
Conservation pool refers to water in a reservoir that lies above the
dead pool and below the normal maximum operating level. For reservoirs
with a flood storage function, the normal maximum operating level also
corresponds to the bottom of the flood pool. When a reservoir's
conservation pool is full, the reservoir is considered full.
Conservation Pool Elevation
The elevation of the top of a reservoir's conservation pool.
Conservation Pool To Dam Top
The vertical distance between top of conservation
pool and dam top.
Conservation Pool To Maximum Design Water Level
The vertical distance between a reservoir's conservation pool and
maximum design water level. See maximum design water level below.
The amount of water present within a reservoir's conservation pool; if
the reservoir is shared with another state or country then conservation
storage refers only to the portion that belongs to Texas.
Dead pool refers to water in a reservoir that cannot be drained by
gravity through a dam's outlet works. Water that is in the dead pool is
not considered part of conservation pool.
A table that relates water surface elevations with volumes and surface
areas for a reservoir. These relationships are obtained from either from
original design documents or from a hydrographic survey of the
reservoir. A single reservoir may have multiple tables that reflect
changes in reservoir conditions due to processes like sedimentation.
Spillway for water to flow past dam into downstream channel to reduce
reservoir storage for dam safety / flood protection purposes. Sometimes,
a spillway can serve both water supply and flood protection purposes.
Also, see spillway below.
Flood Height Percent
The ratio of water level above conservation pool to flood space upper
bound above conservation pool expressed as percentage. The flood space
upper bound is the maximum design water level, or dam top when this
level is not available.
Flood pool refers to water that lies above the conservation pool in
reservoirs with flood storage function. A reservoir's flood pool is used
to regulate floodwaters. Some reservoirs have seasonally-varying flood
Additional dam height above top of flood pool intended to provide
Height Above Conservation Pool
The vertical distance between a reservoir's water surface elevation and
the top of the conservation pool. Negative numbers indicate how far
below 'full' the reservoir is, while positive numbers indicate how far
above the top of the conservation pool the water surface is.
Maximum Design Water Level
A designed water level. By design, when water is below this level,
water pressure will not cause dam to slide or fail.
The ratio of conservation storage to conservation capacity expressed as
The total amount of water that a reservoir can safely hold. It is the
sum of dead pool, conservation pool and flood pool.
The amount of water present in a reservoir.
Part of reservoir capacity that is allocated for storage of sediment
that is expected to be deposited over a certain period of time. Sediment
reserve and dead pool storage are not mutually exclusive.
Spillway for water to flow past dam into downstream channel for water
supply purposes. See spillway below.
(Mostly) a trough-like structure over a dam for water to flow past dam into
The area of the top surface of a reservoir's body of water.
Water Surface Elevation
The elevation of the top surface of a reservoir's body of water.