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UH and VFSM Input
Source Area (UH) - Step 1: UH - Rainfall / Storm Type / Rainfall Estimation
Overland Flow Inputs (.inp)
Rainfall:
mm
Storm Duration
hour
Storm Type I
Storm Type IA
Storm Type II
Storm Type III
Storm R factor in MUSLE
William's
CREAMS/GLEAMS
Storm Type
Storm type I
Storm type IA
Storm type II
Storm type III
Source Area (UH) - Step 2: UH - Source Area / Erosion
Overland Flow Inputs (.inp)
Curve Number
Length along the slope
m
Slope as a fraction
Source Area
ha
C Factor
K Factor
(-1 for program calc.)
(kg*h)/(m
2
*N)
P Factor
USLE P Factor
Land Slope(%)
Contour Factor
Maximum Length m(ft)
1-2
122(400)
3-5
91(300)
6-8
61(200)
9-12
36(120)
13-16
24(80)
17-20
18(60)
21-25
15(50)
Slope
(%)
Conservation Practices factor
Contour
Contour
irrigation line
Terrace
2-7
8-12
13-18
19-24
G
indicates these data could be retrieved from STATSGO Map interface.
Soil Type
G
Clay
Silty clay
Sandy clay
Silty clay loam
Clay loam
Sandy clay loam
Silt
Silt loam
Loam
Very fine sandy loam
Fine sandy loam
Sandy loam
Coarse sandy loam
Loamy very fine sand
Loamy fine sandy
Loamy sand
Loamy coarse sand
Very fine sandy
Fine sand
Sand
Coarse sand
Field capacity
G
(m
3
/m
3
)
Particle Class Diameter
G
(cm)
Percent organic matter
%
Soil Texture (USDA)
Expected
d
p
Soil Texture (USDA)
Expected
d
p
HI
- Clay
0.0000 - 0.0045
HI
- Sandy loam
0.0035 - 0.0160
HI
- Silty clay
0.0002 - 0.0045
HI
- Coarse sand
HI
- Sandy clay
0.0002 - 0.0130
HI
- Coarse sandy loam
HI
- Silty clay loam
0.0030 - 0.0046
HI
- Loamy very fine sand
HI
- Clay loam
0.0005 - 0.0030
HI
- Loamy fine sandy
HI
- Sandy clay loam
0.0021 - 0.0160
HI
- Loamy sand
0.0090 - 0.0180
HI
- Silt
0.0008 - 0.0030
HI
- Loamy coarse sand
HI
- Silt loam
0.0003 - 0.0050
HI
- Very fine sandy
HI
- Loam
0.0009 - 0.0060
HI
- Fine sand
HI
- Very fine sandy loam
HI
- Sand
0.0140 - 0.0200
HI
- Fine sandy loam
Filter Strip (VFSM) Step 1: VFSM - Buffer Dimensions / Vegetation Properties
Overland Flow Inputs (.ikw)
Buffer length
m
Width of the Strip, FWIDTH
m
% of flow spread
= (FWidth / SWidth)
%
Manning's n for uniform VFS segment
(s/m
-1/3
) ,
Average slope (%) of VFS
(%), if not
Buffer Vegetation Prop. (.igr)
Spacing for grass stems, SS
cm
Roughness - Grass Manning's n, VN
s/cm
(1/3)
Vegetation (good stand)
a
Grass spacing
S
s
(cm)
Maximum
height, H (cm)
Modified
n
VN
::: Vegetation typically recommended for VFS :::
1.9
--
--
1.63
38
0.012
1.65
25
0.012
1.63
18
0.012
1.65
30
--
1.35
25
0.016
--
20
0.012
1.35
15
0.016
1.65
20
0.012
2.15
18
0.012
1.5
13
0.012
::: Vegetation
NOT
recommended for VFS :::
3.02
35
0.0084
3.92
40
0.084
5.52
13
0.0084
9.52
--
0.0084
Height of grass, H
cm
Roughness - Bare surface Manning's n, VN2
s/m
(1/3)
Cover
Manning's
n range (recommended), VN2
Avg. Manning's n
0.01-0.013
0.011
0.012-0.033
0.02
0.006-0.16
0.05
0.01-0.32
0.13
0.02-0.24
0.10
0.39-0.63
0.45
0.10-0.20
0.15
0.17-0.30
0.24
0.30-0.48
0.41
Feedback the change in the slope and roughness at the sediment wedge, ICO
Number of Nodes in Solution Domain, N
Time Weight Factor, THETAW
Courant Number, CR
Maximum Iterations, MAXITER
Number of Element Nodal Points NPOL
Output Element Information, IELOUT
Petrov-Galerkin Soultion/Regular Finite Element, KPG
Filter Strip (VFSM) Step 2: VFSM - Soil Parameters / Water Table
Incoming Sed. Prop. (.isd)
Incoming flow sediment (g/cm
3
- CI)
Porosity
(m
3
/m
3
)
Incoming sediment particle class (NPART)
Small aggregate, d50(cm) 0.0030
Large aggregate, d50(cm) 0.0300
Clay, d50 (cm)< 0.0002
Silt(1), 0.0002 < d50 (cm) < 0.0050
Sand, 0.0050 < d50 (cm) < 0.20
Silt(2), 0.0002 < d50 (cm) < 0.0050
User selected
Portion of COARSE Particles in incoming sediment (0 ~ 1)
Sediment particle size, diameter d50 (cm) - DP
Sediment Particle Density (g/cm
3
)
Infiltration - Soil Prop. (.iso)
- Soil Prop. of 1st and 2nd Layers
1st Layer
2nd Layer
- First Soil Layer Depth : 0 (cm) ~
(cm) - Second Soil Layer Depth :
(cm) ~
(cm)
Vertical Saturated K
s
, VKS
(m/s) or
(cm/h)
Average Suction
at the Wetting Front, Sav(m)
(m)
Initial Water Content, OI
m
3
/m
3
Saturated Water Content, OS
m
3
/m
3
Maximum Surface Storage,
SM
m
Fraction of the filter
where ponding is checked (0 ~ 1)
Vertical Saturated K
s
, VKS
(2nd Soil Layer)
(m/s) or
(cm/h)
Average Suction
at the Wetting Front, Sav(m)
(2nd Soil Layer)
(m)
Initial Water Content, OI
(2nd Soil Layer)
m
3
/m
3
Saturated Water Content, OS
(2nd Soil Layer)
m
3
/m
3
Do you have shallow water table data? If so, select
Yes, or
No
Water Table Depth from surface
m
::: Please select Soil Water Characteristic Curve option :::
van Genuchten
Brooks and Corey
(m
3
/m
3
)
VGALPHA,
1/m
VGN
VGM
(m
3
/m
3
)
BCALPHA,
1/m
BCLAMBDA
::: Please select Hydraulic Conductivity Curve option :::
van Genuchten
Brooks and Corey
Gardner
VGM
BCETA
BCALPHA
GNDALPHA,
1/m
Filter Strip (VFSM) Step 3: Rainfall / Incoming Hydrograph
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Filter Strip (VFSM) Step 4: VFSM - Water Quality
Do you want to simulate:
No Pesticide
Pesticide
Pesticide & degradation
No Pesticide Sim.
No pesticide simulation will be made
Pesticide Prop. (.iwq)
Pesticide
KOC :
OC :
KD :
Half-life :
% Clay content in incoming Sediment:
%
Do you want to simulate pesticide degradation between storm events? If so, select
Yes, or
No
Standard Design Step 1: Selection of UH / VFSM runs
Standard Design:::
UH
Run:
VFSM
Run:
VL: m
Standard Design Step 2: Design of Optimum Length of VFS
Standard Design
- Enter Design Storm Duration
(hr)
- Please select either
Design Storm Specific Values, or
Design Storm Range
Return Period, T (Years)
Design Storm
Specific Values (mm)
Start (mm)
End (mm)
Increment (mm)
Lower
Upper
Increment
Base (default VFS length)
Specify VFS Length (m)
Advanced Design Step 1: Selection of VFSM run
Advanced Design ::: Name of
VFSM
Run:
VL: m
Advanced Step 2: Design of Optimum Length of VFS
Advanced Design
Please click
button to add your storm data:
Lower
Upper
Increment
Base (default VFS length)
Specify VFS Length (m)
-----
(UH Ver. 3.0.2 + VFSM Ver. 4.2.4 (2014 - with Pesticide and Groundwater table components)
Terminology
UH - Rain/Storm
UH - Source Area/Erosion
VFSM - Buffer / Vegetation Prop.
VFSM - Soil Param. , Water Table
VFSM - Upload / Edit .IRO / .IRN
VFSM - Water Quality
Standard Design
Advanced Design
Model Input/Output
Select Project name for more information
::: Now Initializing the VFSMOD WWW Application :::
Now Loading....
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Web-based VFSMOD
...
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::: Runoff curve numbers for cultivated agricultural lands. :::
1) Enter CN value for your field:
or,
2) select below.
Select Cover Type
Fallow
Row crops
Small grain
Close-seeded
Broadcast legumes
Rotation meadow
Select Treatment
Select Hydro. Condition
HSG A
HSG B
HSG C
HSG D
Please wait
(From USDA-NRCS;210-VI-TR-55, 2nd Edition, June 1986, Table 2-2b)
::: :::
Your Project Name
- Project name
Press 'Enter'(Chrome/Safari) or click Here(IE)
- Project description
[Optional]
Option 1:
Option 2:
Option 3:
Option 4:
Output - Single Storm version
Output - Standard Design or Advanced Design
Core Engine:
UH Ver. 3.0.2 and VFSM Ver. 4.2.4
developed by
Prof. Rafael Munoz-Carpena
at UF
::: :::
Now initializing the VFSMOD Web App
Click on the map to get precipitation frequency info.
Mouse Move
Mouse Click
Marker
Storm Type selected...
Click on the map to get precipitation frequency info.
Storm Type I
Storm Type IA
Storm Type II
Storm Type III
Approximate geographic boundaries for SCS rainfall distributions (SCS, 1986)
::: Pesticide Common Name / Trade Name . :::
Pestcide Common Name
Pesticide Trade Name
(Pesticide database from the
WinAPEX
model DB was used)
Please enter a word or full name and wait for
a couple of seconds
KOC:
* % Organic Carbon:
=
KD:
Half-life:
Please wait
(Pesticide databases from WinAPEX model)
::: Pesticide degradation ---- :::
Select pesticide degradation rate formulation
EU-FOCUS
US-EPA
k(T)
k(Θ)
Total pesticide mass entering the filter per unit area of the source field
Pesticide Mass :
(mg/m
2
)
Surface mixing layer thickness
Mixing Layer :
(cm)
Daily air temperature and Top soil water content Θ (m
3
/m
3
)
Air temp. in
°C, or
°F
Storm:
From:
To:
NDGDAY:
Day
Air Temp.
Soil moisture
ABC
Field capacity of topsoil.
Field Capacity:
G
(m
3
/m
3
)
This VFSMODP Web system was developed with Collaboration between Kangwon National Univ. in Korean and University of Florida
::: STATSGO Soil Map for Soil Texture :::
Select:
::: Country/State :::
S. Korea
Florida, USA
Indiana, USA
Illinois, USA
Ohio, USA
Iowa, USA
Texas, USA
Louisiana, USA
Send me WMS code
Select Soil Texture
Clay
Silty clay
Sandy clay
Silty clay loam
Clay loam
Sandy clay loam
Silt
Silt loam
Loam
Very fine sandy loam
Fine sandy loam
Sandy loam
Coarse sandy loam
Loamy very fine sand
Loamy fine sandy
Loamy sand
Loamy coarse sand
Very fine sandy
Fine sand
Sand
Coarse sand
Selected Texture from Map:
(STATSGO data from ... )
