yo and hosphorus - uwsp › cnr-ap › uwexlakes › documents › ... · 0 0.5 1 1.5 0.01 0.1 1 10...
TRANSCRIPT
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YOU AND PHOSPHORUS
Wisconsin Lake Leaders2008
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Making a Positive Connection Between Land and Lake
Wisconsin Lake Leaders2008
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Zooplankton
Bacteria
WATER
Algae
FISHWaterQuality
N U T R I E N T S
Why do we care about P?
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• Add a little extra P to a lake, and you can make a lot of algae…
-
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Phosphorus Concentration
(mg/l)
Productivity
10 Low (Oligotrophic)
10-20 Medium (Mesotrophic)
Greater than 20 High (Eutrophic)
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Let’s think about the water!
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THE WISCONSIN WATER STORY
32”
32”
20”
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NETWATER BUDGET 12”
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32”
20”
12”32”
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Do you see any
phosphorus here?
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Assume a 300’ shoreline zoneAnd 300 acre lake…
•300 acre•Circular Lake•200 mg/kg soil P•100 lb/acre P
•300 acre•25’ mean depth•15 ug/l TPLikens and Bormann, 1995 (Biogeochemistry
Of a Forested Ecosystem);Schlesinger, 1991 (Biogeochemistry); Wetzel, 2001 (Limnology).
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How much phosphorus in the Lake?
•300 acre•Circular Lake•200 mg/kg soil P•100 lb/acre P
300 lbs (water)
•300 acre•25’ mean depth•15 ug/l TPLikens and Bormann, 1995 (Biogeochemistry
Of a Forested Ecosystem);Schlesinger, 1991 (Biogeochemistry); Wetzel, 2001 (Limnology).
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How much phosphorus in the Land?
40,000 lbs+/-
•300 acre•Circular Lake•200 mg/kg soil P•100 lb/acre P
•300 acre•25’ mean depth•15 ug/l TPLikens and Bormann, 1995 (Biogeochemistry
Of a Forested Ecosystem);Schlesinger, 1991 (Biogeochemistry); Wetzel, 2001 (Limnology).
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Phosphorus can be
used and reused
and reused
and reused…
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Usually low
concentrations in
water that has
moved through
soil
~20 mg/l
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Water running
Off the land
Has much higher
concentrations
~1000 mg/l
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• Lots of phosphorus in soils & vegetation
• Lots of water moving through land to water
• Amount of phosphorus transferred depends on the path the water takes
– Direct, surface runoff conveys much more phosphorus than infiltrating water
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0
20
40
60
80
100
120
140
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Phosphorus Transfer Rate (pounds/acre/year)
Lake P
ho
sp
ho
rus (
ug
/l)
Lake
Phosphorus
Conc
(mg/l)
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How do we increase P transfer?
• Impervious surfaces
• Compact soil
• Open/bare soil
• Shape to the lake and stream
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How do we increase P transfer?
• Impervious surfaces
• Compact soil
• Open/bare soil
• Shape to the lake and stream
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Rainfall
Let’s Follow the Water…
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Rain
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Runon: Water from adjacent impervious surfaces
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Infiltration:water entry into a pervious surface
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Ponding: water arrives faster than it can infiltrate
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Surface Runoff:horizontal movement of ponded water (after surface storage satisfied)
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The Rain
32 Inches per Year +/-
100 storms per year +/-
500 hours of precipitation (>trace)
per year +/-
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0.01
0.1
1
10
100
1000
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2
Inches / Hour
Ho
urs
/ Y
ea
r
Based on P8 hourly rainfall
File for 36 years, Madison
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0.01
0.1
1
10
100
1000
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2
Inches / Hour
Ho
urs
/ Y
ea
r
Based on P8 hourly rainfall
File for 36 years, Madison
¼ inch/hour
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0.01
0.1
1
10
100
1000
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2
Inches / Hour
Ho
urs
/ Y
ea
r
Based on P8 hourly rainfall
File for 36 years, Madison
½ inch/hour
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0.01
0.1
1
10
100
1000
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2
Inches / Hour
Ho
urs
/ Y
ea
r
Based on P8 hourly rainfall
File for 36 years, Madison
½ inch/hour
1 inch/hour
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Low Moisture High Moisture
At higher moisture contents, more (..most) of the water
is moving in the larger openings (pores)
Water Infiltration & Movement
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Pore Size and TextureCoarse soils can have more larger pores
Clay Loam Loamy Sand
Factors Controlling Water Movement
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Pore Sizes: MacroporesWhen very large pores are present (“macropores”),
They can dominate flow at high moisture content
Clay Loam Loamy Sand
Factors Controlling Water Movement
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Soil StructureAggregations of soil particles with larger openings between
Less Structure More Structure
Factors Controlling Water Movement
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• Sand– 2 to more than 10 inches/hour
• Silt Loam– 0.2 inches/hour to 1 inch/hour
• Clay– 0.03 to 0.3 inch/hour
Example Infiltration Rates
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Reducing Infiltration Rates
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Raindrop Impact
Terminal velocity of 10-30 mph can break up structure. Small particles
washed into openings forms “surface seal” and dries to form surface crust
Factors Controlling Water Movement
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CompactionMove aggregates or particles together, reduce porosity – increase bulk density
Uncompacted Compacted
Factors Controlling Water Movement
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Compaction
ConditionPonded
Infiltration Rate (in/hr)
Vegetated 3.4
Open Soil 0.7
Traffic 0.1Silt loam soil described by
Vervoort, R.W., S.M. Dabney and
M.J.M. Romkens. 2001. Tillage and Row
Position Effects on Water and Solute
Infiltration Characteristics, Soil Science
Society of America Journal 65:1227-1234.
Factors Controlling Water Movement
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Runoff Infiltration
Experiments
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1000 ft2 roof1/2 inch rain in 1 hour 0.0
0.1
0.2
0 10 20 30 40 50 60
Minutes
Inch
es /
10 m
in
0.0
0.2
0.4
0.6
0.0 0.5 1.0 1.5 2.0
Hours
Flo
w (
lite
r/s
ec
on
d)
Rain
Runoff from Roof
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2’ Wide 10’ Long
1”/hr
0.0
0.2
0.4
0.6
0.0 0.5 1.0 1.5 2.0
Hours
Flo
w (
lite
r/s
ec
on
d)
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0.0
0.2
0.4
0.6
0.0 0.5 1.0 1.5 2.0
Hours
Flo
w (
lite
r/s
ec
on
d)
2’ Wide 10’ Long
2”/hr
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50% Runoff
0.0
0.2
0.4
0.6
0.0 0.5 1.0 1.5 2.0
Hours
Flo
w (
lite
r/s
ec
on
d)
2’ Wide 10’ Long
10”/hr
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25% Runoff
0.0
0.2
0.4
0.6
0.0 0.5 1.0 1.5 2.0
Hours
Flo
w (
lite
r/s
ec
on
d)
2’ Wide 10’ Long
20”/hr
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Rainfall IntensityRunon VolumeInfiltration RateGeometry & Slope
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0
0.5
1
1.5
0.01 0.1 1 10
Infiltration Rate (in/hr)
Fra
cti
on
of
Ru
no
n T
ha
t
Ru
ns
Off
1.3"
0.1"
0.25"
0.5"
. The fraction of runon to the secondary buffer that would infiltrate for different
storm sizes and infiltration rates (assumes a 500 ft2 impervious area draining to a
five foot wide channel, forty feet long and one hour storm of depth shown).
Dashed lines show the fitted equation based on soil infiltration rate and storm
depth.
Runon Ratio500 / 5(w) x 40 (L)
¼ - ½ inch/hour
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Estimating Your Phosphorus Footprint
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Impervious surfaces
Infiltrationcharacteristics
InfiltrationDevices
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Impervious surfaces
Infiltrationcharacteristics
InfiltrationDevices
RunoffVolumeEstimate
RunoffConcentration
Estimate
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Rainfall
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Rainfall
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0
0.5
1
1.5
0.01 0.1 1 10
Infiltration Rate (in/hr)
Fra
cti
on
of
Ru
no
n T
ha
t
Ru
ns
Off
1.3"
0.1"
0.25"
0.5"
. The fraction of runon to the secondary buffer that would infiltrate for different
storm sizes and infiltration rates (assumes a 500 ft2 impervious area draining to a
five foot wide channel, forty feet long and one hour storm of depth shown).
Dashed lines show the fitted equation based on soil infiltration rate and storm
depth.
Runon Ratio500 / 5(w) x 40 (L)
¼ - ½ inch/hour
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40
50
60
70
80
90
100
0% 5% 10% 15% 20% 25% 30% 35%
Raingarden Size (% of Impervious)
Perc
en
t In
filt
rate
d
Sand Silt Clay
Percent Infiltrated =
150 * (Fraction Imp) (̂-0.0321 ln Infil Rate +0.2356)
Percentage of the annual average rainfall infiltrated for different infiltration area sizes (shown as a percentage of the impervious area) for sand, fine sand, silt and clay. The symbols show the results of individual RECARGA simulations, the dashed lines show the single-soil best fit, and the solid lines show the single-equation fit (equation shown on the figure)for all textures.
Percent of theAverage Year
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Shrinking Our Footprint
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Reduce Runoff
Generation
Reduce Impervious Area
Promote High Infiltration Rates in Pervious Areas
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InfiltrateRunoff
Generated
Allow water to spread out (take advantage of infiltration geometry and don’t channelize)
Impound where possible (raingardens, trenches)
Promote High Infiltration Rates in Pervious Areas
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InfiltrateRunoff
Generated
Don’t compact
Don’t shape to lake
No bare soil
Don’t make it easy for the water to get to the lake
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• Stay-tuned…there is still a lot we don’t know…
– Micro-topography
– Winter…
– Other considerations
FUTURE
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THANKS
Thanks tomany folks from the WDNR (Buzz, Tim, Carroll, Steve, Gregg…) from Lake Groups, Counties, UWExtension & UWSP (Bob, Patrick, Tiffany, Nancy…), Graduate Students (Kaylea, Darrin, Adam…)
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How do we decrease P transfer?
• Vegetation
• Don’t compact
• Don’t channelize
• Don’t shape to the lake
• Direct impervious surface runoff to infiltration areas
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~ 31 million seconds in
a year
12 inches water on 1 square milein a year
= 28 Million Cubic FeetOf water each year
= almost 1 cubic foot of water
every second -- every square mile!
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Summary
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Rainfall
Let’s Follow the Water…
Infiltra
te
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Assume a 300’ shoreline zoneAnd 300 acre lake…
•300 acre•Circular Lake•200 mg/kg soil P•100 lb/acre P
•300 acre•25’ mean depth•15 ug/l TPLikens and Bormann, 1995 (Biogeochemistry
Of a Forested Ecosystem);Schlesinger, 1991 (Biogeochemistry); Wetzel, 2001 (Limnology).
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How much phosphorus in the Lake?
•300 acre•Circular Lake•200 mg/kg soil P•100 lb/acre P
300 lbs (water)
•300 acre•25’ mean depth•15 ug/l TPLikens and Bormann, 1995 (Biogeochemistry
Of a Forested Ecosystem);Schlesinger, 1991 (Biogeochemistry); Wetzel, 2001 (Limnology).
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How much phosphorus in the Land?
40,000 lbs+/-
•300 acre•Circular Lake•200 mg/kg soil P•100 lb/acre P
•300 acre•25’ mean depth•15 ug/l TPLikens and Bormann, 1995 (Biogeochemistry
Of a Forested Ecosystem);Schlesinger, 1991 (Biogeochemistry); Wetzel, 2001 (Limnology).
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Comparing Lake and Land…
40,000 lbs+/-
•300 acre•Circular Lake•200 mg/kg soil P•100 lb/acre P
300 lbs (water)
•300 acre•25’ mean depth•15 ug/l TPLikens and Bormann, 1995 (Biogeochemistry
Of a Forested Ecosystem);Schlesinger, 1991 (Biogeochemistry); Wetzel, 2001 (Limnology).
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1 mg/l
0.02 mg/l
0.05 pound/acre/yr
2.7 pound/acre/yr
Assumes 12 inches runoff
RECALL --- Back of the envelope comparisongroundwater versus surface runoff
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0
0.5
1
1.5
0.01 0.1 1 10
Infiltration Rate (in/hr)
Fra
cti
on
of
Ru
no
n T
ha
t
Ru
ns
Off
1.3"
0.1"
0.25"
0.5"
. The fraction of runon to the secondary buffer that would infiltrate for different
storm sizes and infiltration rates (assumes a 500 ft2 impervious area draining to a
five foot wide channel, forty feet long and one hour storm of depth shown).
Dashed lines show the fitted equation based on soil infiltration rate and storm
depth.
Runon Ratio500 / 5(w) x 40 (L)
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0
0.5
1
1.5
0.01 0.1 1 10
Infiltration Rate (in/hr)
Fra
cti
on
of
Ru
no
n T
ha
t
Ru
ns
Off
1.3"
0.1"
0.25"
0.5"
. The fraction of runon to the secondary buffer that would infiltrate for different
storm sizes and infiltration rates (assumes a 500 ft2 impervious area draining to a
five foot wide channel, forty feet long and one hour storm of depth shown).
Dashed lines show the fitted equation based on soil infiltration rate and storm
depth.
Runon Ratio500 / 5(w) x 40 (L)
¼ - ½ inch/hour
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Design Infiltration Areas
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Infiltration Device
• Designed to facilitate the entry and movement of precipitation or runoff into or through the soil
Here shown with
increased surface
storage capacity
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• Make it hard for the water to get to the lake
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SUMMARY
• Make it hard for the water to get to the lake
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• No compaction
• No shaping for drainage
• No bare soil
SUMMARY
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• No compaction
• No shaping for drainage
• No bare soil
SUMMARY
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• Slow it down &
• Infiltrate
SUMMARY
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• Slow it down &
• Infiltrate
SUMMARY
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Challenges
• The “baseline” may be low
• Treatment for phosphorus probably not as efficient as TSS
• How do you measure the extent to which this impervious is connected?
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0
20
40
60
80
100
120
140
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Phosphorus Transfer Rate (pounds/acre/year)
Lake P
ho
sp
ho
rus (
ug
/l)
Lake
Phosphorus
Conc
(mg/l)
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0
20
40
60
80
100
120
140
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Phosphorus Transfer Rate (pounds/acre/year)
Lake P
ho
sp
ho
rus (
ug
/l)
Lake
Phosphorus
Conc
(mg/l)
Large Watershed/LakeRatio
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0
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0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Phosphorus Transfer Rate (pounds/acre/year)
La
ke P
ho
sp
ho
rus
(u
g/l
)
Lake
Phosphorus
Conc
(mg/l)
Small Watershed/LakeRatio
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0
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0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Phosphorus Transfer Rate (pounds/acre/year)
Lake P
ho
sp
ho
rus (
ug
/l)
Lake
Phosphorus
Conc
(mg/l)
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Lakes
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FISHWaterQuality
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This water is always moving!
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Zooplankton
BacteriaAlgae
FISHWaterQuality
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Zooplankton
Bacteria
WATER
Algae
FISHWaterQuality
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How do we keep all this water (and nutrients) on the land
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0
0.5
1
1.5
0.01 0.1 1 10
Infiltration Rate (in/hr)
Fra
cti
on
of
Ru
no
n T
ha
t
Ru
ns
Off
1.3"
0.1"
0.25"
0.5"
. The fraction of runon to the secondary buffer that would infiltrate for different
storm sizes and infiltration rates (assumes a 500 ft2 impervious area draining to a
five foot wide channel, forty feet long and one hour storm of depth shown).
Dashed lines show the fitted equation based on soil infiltration rate and storm
depth.
Runon Ratio500 / 5(w) x 40 (L)
¼ - ½ inch/hour