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	$SA_{em}$: Surface area of the pond when filled to the emergency spillway (ha)	.pnd
PND_PSA	$SA_{pr}$: Surface area of the pond when filled to the principal spillway (ha)	.pnd
PND_EVOL	$V_{em}$: Volume of water held in the pond when filled to the emergency spillway (10$^4$ m$^3$ H$_2$O)	.pnd
PND_PVOL	$V_{pr}$: Volume of water held in the pond when filled to the principal spillway(10$^4$ m$^3$ H$_2$O)	.pnd
WET_MXSA	$SA_{mx}$: Surface area of the wetland when filled to the maximum water level (ha)	.pnd
WET_NSA	$SA_{nor}$: Surface area of the wetland when filled to the normal water level (ha)	.pnd
WET_MXVOL	$V_{mx}$: Volume of water held in the wetland when filled to the maximum water level (m$^3$ H$_2$O)	.pnd
WET_NVOL	$V_{nor}$: Volume of water held in the wetland when filled to the normal water level (m$^3$ H$_2$O)	.pnd
PND_FR	$fr_{imp}$: Fraction of the subbasin area draining into the pond	.pnd
WET_FR	$fr_{imp}$: Fraction of the subbasin area draining into the wetland	.pnd
PND_K	$K_{sat}$: Effective saturated hydraulic conductivity of the pond bottom (mm/hr)	.pnd
WET_K	$K_{sat}$: Effective saturated hydraulic conductivity of the wetland bottom (mm/hr)	.pnd
IFLOD1	$mon_{fld,beg}$: Beginning month of the flood season	.pnd
IFLOD2	$mon_{fld,end}$: Ending month of the flood season	.pnd
NDTARG	$ND_{targ}$: Number of days required for the reservoir to reach target storage	.pnd