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Drainage Water Management 
Options And Strategies To Improve Water Quality
Alex Echols
echols@conrod.com
703/660‐2366
Key Functions Altered Nitrogen Discharge
1. Increase Use of Synthetic Nitrogen
2. Shift From Forage and Small Grains to Large 
Grain Production
3. Altered Hydrology to Move Water Off 
Landscape Very Efficiently
Nitrogen Impaired Waters
Agricultural Drainage
(Jaynes and James 2008)
s
M
o
v
e
W
a
t
e
r 
O
f
How Water Moves Off Ag Lands
What Is Drainage Water Management?
A series of practices that captures, collects or processes 
nutrients discharged from agricultural lands.
1. Drainage Water Management
2. Saturated Buffers
3. Bio Reactors
4. Nutrient Treatment Wetlands
5. Emerging Technologies
– Phosphorous Filters
– Sub Surface Irrigation
– Swarm Technology
Installation of Modern Drainage 
Drainage Water Management
Seasonal Schedule
Winter Spring
Summer Fall
Fully Instrumented/Automated
Control
Measure
Report
Bio Reactor
Saturated Buffer
Top
View
Side View
Phosphorus Filter
Swarm Intelligence
Linking multiple (potentially
thousands) of structures to
communicate and maximize
desired outcomes.
For example, water quality
flood reduction, agronomic
production.
Benefits are distributed
throughout the watershed.
Causes of Loss for Iowa Corn,
1948-2010
Causes of Loss for Iowa Soy,
1955-2010
Charts courtesy of Chad Hart, Managing Risk in Agriculture, Iowa State
University, June 2013
Causes of Crop Loss
So What?
On Farm Benefits
1. DWM Increase Ag Production (5% ‐ 10%)
2. DWM Decrease Nutrient Input (15%?)
3. DWM Reduce Risk (25%?)
4. DWM Reduce Water Input Needs (%?)
5. Subsurface Irrigation Reduce Risk (66%)
6. Bioreactor, Saturated Buffers, Phosphorous 
Filters, Etc.  Zero On Farm Benefits
So What #2?
Off Farm Benefits Of DWM
1. Each practice performance highly reliable
2. Each practice performance highly 
quantifiable
3. Each practice performance easily 3rd
party certified
4. Each practice capital investment that will 
operate for years
5. Cost – out perform other nutrient 
strategies
Ecosystem Service Trading
Direct Costs (Excludes On Farm Benefits)
Retrofit DWM 0.50 – 0.70/lbN
New DWM 0.37 ‐ 3.01/lbN* (*includes new tile)
BioReactor 1.08 – 33.37/lbN
Wetland 2.96 – 11.78/lbN
Saturated Buffers 0.99/lbN
Cover Crops 5.02‐ 64.90/lbN
Municipal Wastewater
Municipal Stormwater
100.00 – 1000.00/lbN
90.0 – 944.0/lbN
DWM assumes 20 year life cycle
Bioreactors assumes 20 year life cycle
Saturated Buffers assumes 20 year life cycle
Wetland Assumes 25 year life cycle
Cover Crops assumes annual cycle
Conclusions
1. No Magic Bullet ‐ Need a Systems Approach
2. Need to recognize the variability of agriculture
3. Practices that produce significant on site benefits require less 
outside support
4. Practices that are…
a. easily quantified environmental performance
b. highly reliable
c. easily third party certified
d. have clear property rights
…are more readily accepted to ecosystem service markets
5. We can no longer rely on “Farm Bill” incentives alone but must 
find additional funding sources
6. DWM practices are among the most attractive
conservation management actions to enter into
ecosystem service markets
When land does well for its owner, and
the owner does well by his land;
When both end up better by reason of
their partnership, we have conservation.
When one or the other grows poorer, we
do not.
- Aldo Leopold
The Farmer as Conservationist
1939
Drainage Water Management 
Options And Strategies To Improve Water Quality
Alex Echols
echols@conrod.com
703/660‐2366
Thank You
Please Send Comments 

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