{UTF-8}
outflow rate=
	0.5
	~	 [0,1,0.05]
	~		|

pollutant concentration in pond=
	pollutant in pond/water in pond
	~	
	~		|

pollutant in pond= INTEG (
	pollutant release rate-pollutant outflow,
		0)
	~	
	~		|

pollutant outflow=
	water outflow from pond*pollutant concentration in pond
	~	
	~		|

pollutant release rate=
	50
	~	
	~		|

pond volume=
	IF THEN ELSE(volume switch = 0, 1000 , 2000 )
	~	
	~		|

toxic pollutant concentration=
	0.758
	~	
	~		|

volume switch=
	0
	~	 [0,1,1]
	~		|

water in pond= INTEG (
	water inflow to pond-water outflow from pond,
		pond volume)
	~	
	~		|

water inflow to pond = WITH LOOKUP (
	Time,
		([(0,0)-(100,100)],(0,100),(10,100),(20,100),(30,100),(40,100),(50,100),(60,100),(70\
		,100),(80,100),(90,100),(100,100) ))
	~	
	~		|

water outflow from pond=
	(water in pond-pond volume)*outflow rate
	~	
	~		|

********************************************************
	.Control
********************************************************~
		Simulation Control Parameters
	|

FINAL TIME  = 100
	~	Month
	~	The final time for the simulation.
	|

INITIAL TIME  = 0
	~	Month
	~	The initial time for the simulation.
	|

SAVEPER  = 
        TIME STEP
	~	Month [0,?]
	~	The frequency with which output is stored.
	|

TIME STEP  = 1
	~	Month [0,?]
	~	The time step for the simulation.
	|

\\\---/// Sketch information - do not modify anything except names
V300  Do not put anything below this section - it will be ignored
*View 1
$192-192-192,0,Comic Sans MS|12||0-0-0|0-0-0|0-0-255|-1--1--1|-1--1--1|120,120,100,0
10,1,water in pond,508,199,50,25,3,3,0,0,0,0,0,0
12,2,48,186,193,10,8,0,3,0,0,-1,0,0,0
1,3,5,1,4,0,0,22,0,0,0,-1--1--1,,1|(397,193)|
1,4,5,2,100,0,0,22,0,0,0,-1--1--1,,1|(258,193)|
11,5,48,328,193,8,10,34,3,0,0,1,0,0,0
10,6,water inflow to pond,328,226,74,28,40,3,0,0,-1,0,0,0
12,7,48,805,199,10,8,0,3,0,0,-1,0,0,0
1,8,10,7,4,0,0,22,0,0,0,-1--1--1,,1|(739,199)|
1,9,10,1,100,0,0,22,0,0,0,-1--1--1,,1|(612,199)|
11,10,48,675,199,8,10,34,3,0,0,1,0,0,0
10,11,water outflow from pond,675,233,68,28,40,3,0,0,-1,0,0,0
10,12,pollutant in pond,501,434,50,25,3,3,0,0,0,0,0,0
12,13,48,205,425,10,8,0,3,0,0,-1,0,0,0
1,14,16,12,4,0,0,22,0,0,0,-1--1--1,,1|(396,425)|
1,15,16,13,100,0,0,22,0,0,0,-1--1--1,,1|(270,425)|
11,16,48,334,425,8,10,34,3,0,0,1,0,0,0
10,17,pollutant release rate,334,459,80,28,40,3,0,0,-1,0,0,0
12,18,48,836,438,10,8,0,3,0,0,-1,0,0,0
1,19,21,18,4,0,0,22,0,0,0,-1--1--1,,1|(761,438)|
1,20,21,12,100,0,0,22,0,0,0,-1--1--1,,1|(615,438)|
11,21,48,688,438,8,10,34,3,0,0,1,0,0,0
10,22,pollutant outflow,688,461,42,28,40,3,0,0,-1,0,0,0
10,23,pollutant concentration in pond,513,314,104,28,8,3,0,2,0,0,0,0,-1--1--1,0-0-0,|0||0-0-255
10,24,pond volume,735,94,58,15,8,3,0,0,0,0,0,0
10,25,volume switch,881,56,68,14,8,3,0,0,0,0,0,0
10,26,outflow rate,829,316,59,15,8,3,0,0,0,0,0,0
1,27,1,23,0,0,0,0,0,64,0,-1--1--1,,1|(509,248)|
1,28,12,23,0,0,0,0,0,64,0,-1--1--1,,1|(505,382)|
1,29,26,11,1,0,0,0,0,64,0,-1--1--1,,1|(721,345)|
1,30,1,11,0,0,0,0,0,64,0,-1--1--1,,1|(575,212)|
1,31,24,11,1,0,0,0,0,64,0,-1--1--1,,1|(683,136)|
1,32,25,24,0,0,0,0,0,64,0,-1--1--1,,1|(816,72)|
1,33,11,22,1,0,0,0,0,64,0,-1--1--1,,1|(634,341)|
1,34,23,22,0,0,0,0,0,64,0,-1--1--1,,1|(594,382)|
1,35,24,1,0,0,0,0,0,64,1,-1--1--1,,1|(636,139)|
10,36,toxic pollutant concentration,121,628,89,52,8,131,0,3,0,3,0,0,255-0-0,0-0-0,|0||255-0-0
12,37,2687524,1175,240,188,188,3,12,0,0,1,0,0,0
Pollution_Concentration_
10,38,Time,113,301,33,14,8,2,0,3,-1,0,0,0,128-128-128,0-0-0,|12||128-128-128
1,39,38,6,1,0,0,0,0,64,0,-1--1--1,,1|(291,280)|
///---\\\
:GRAPH Pollution_Concentration_
:TITLE Pollution Concentration in Pond
:X-AXIS Time
:SCALE
:VAR pollutant concentration in pond
:Y-MIN 0
:Y-MAX 1
:LINE-WIDTH 3
:VAR toxic pollutant concentration
:LINE-WIDTH 3
:L<%^E!@
1:Current.vdf
9:Current
23:0
15:0,0,0,0,0,0
19:100,0
27:2,
34:0,
4:Time
5:toxic pollutant concentration
24:0
25:100
26:100