1 of 1

Wetland Outflow

The wetland releases water whenever the water volume exceeds the normal storage volume, $V_{nor}$ . Wetland outflow is calculated:

$V_{flowout}=0$ if $V<V_{nor}$ 8:1.2.14

$V_{flowout}=\frac{V-V_{nor}}{10}$ if $V_{nor} \le V \le V_{mx}$ 8:1.2.15

$V_{flowout}=V-V_{mx}$ if $V>V_{mx}$ 8:1.2.16

where $V_{flowout}$ is the volume of water flowing out of the water body during the day (m $^3$ H $_2$ O), $V$ is the volume of water stored in the wetland (m $^3$ H $_2$ O), $V_{mx}$ is the volume of water held in the wetland when filled to the maximum water level (m $^3$ H $_2$ O), and $V_{nor}$ is the volume of water held in the wetland when filled to the normal water level (m $^3$ H $_2$ O).

Table 8:1-2: SWAT+ input variables that pertain to ponds and wetlands.

PND_ESA

.pnd

PND_PSA

.pnd

PND_EVOL

.pnd

PND_PVOL

.pnd

WET_MXSA

.pnd

WET_NSA

.pnd

WET_MXVOL

.pnd

WET_NVOL

.pnd

PND_FR

.pnd

WET_FR

.pnd

PND_K

.pnd

WET_K

.pnd

IFLOD1

.pnd

IFLOD2

.pnd

NDTARG

.pnd

Wetland Outflow

The wetland releases water whenever the water volume exceeds the normal storage volume, $V_{nor}$ . Wetland outflow is calculated:

$V_{flowout}=0$ if $V<V_{nor}$ 8:1.2.14

$V_{flowout}=\frac{V-V_{nor}}{10}$ if $V_{nor} \le V \le V_{mx}$ 8:1.2.15

$V_{flowout}=V-V_{mx}$ if $V>V_{mx}$ 8:1.2.16

Table 8:1-2: SWAT+ input variables that pertain to ponds and wetlands.

PND_ESA

: Surface area of the pond when filled to the emergency spillway (ha)

.pnd

PND_PSA

: Surface area of the pond when filled to the principal spillway (ha)

.pnd

PND_EVOL

: Volume of water held in the pond when filled to the emergency spillway (10 m HO)

.pnd

PND_PVOL

: Volume of water held in the pond when filled to the principal spillway(10 m HO)

.pnd

WET_MXSA

: Surface area of the wetland when filled to the maximum water level (ha)

.pnd

WET_NSA

: Surface area of the wetland when filled to the normal water level (ha)

.pnd

WET_MXVOL

: Volume of water held in the wetland when filled to the maximum water level (m HO)

.pnd

WET_NVOL

: Volume of water held in the wetland when filled to the normal water level (m HO)

.pnd

PND_FR

: Fraction of the subbasin area draining into the pond

.pnd

WET_FR

: Fraction of the subbasin area draining into the wetland

.pnd

PND_K

: Effective saturated hydraulic conductivity of the pond bottom (mm/hr)

.pnd

WET_K

: Effective saturated hydraulic conductivity of the wetland bottom (mm/hr)

.pnd

IFLOD1

: Beginning month of the flood season

.pnd

IFLOD2

: Ending month of the flood season

.pnd

NDTARG

: Number of days required for the reservoir to reach target storage

.pnd