farm water managementcrkeyline.ca/.../2016/12/farm-water-management-.pdf · on small farms in our...
TRANSCRIPT
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!Farm Water Management Slow, Sink, Spread, Store & Plan for Overflow
Nov. 28, 2016 Tayler Krawczyk Hatchet & Seed
www.hatchetnseed.ca
Hatchet & SeedEdible Landscapes + Eco-Design
Funding by:
Supported by:
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Take Home Lessons for Today
! Slow – reduce velocity of storm runoff, reduce erosion, protect rivers/streams from dangerous swelling
! Spread - use gravity to move water from wet areas (valleys) to dry areas (ridges)
! Sink – increase infiltration & percolation, increase ‘interflow’, increase groundwater recharge
! Store – hold water in retention basins, dugouts, ponds reservoirs and in high OM soil for later use
! Plan for Overflow – plan where where record storm-water surges will go, don’t be surprised
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www.hatchetnseed.ca
Hatchet & SeedEdible Landscapes + Eco-Design
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“We can stabilize climate [store carbon, and restore watershed function] as a by-product of profitable, ecological farming.”
- Abe Collins, Holistic Planned Grazing Practitioner
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Our Regional Climate Context
https://en.wikipedia.org/wiki/Rain_shadow
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CRD Regional Climate Modeling
Highlights from the findings include: - Extreme temperatures (32°C to 35°C) are projected to occur almost
four times as often in future CRD.- The amount of precipitation falling during very wet days is projected to
increase by 20%; with precipitation during extremely wet days projecting to increase by 25% in CRD
- More extreme precipitation events (with 3-hour duration) are projected to occur on average three and a half times as often in future in CRD.
- There will be fewer Heating Degree Days and a substantial increase in Cooling Degree Days in CRD
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The ‘Mediterranean Water Management’ Blues
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http://victoria.weatherstats.ca/
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www.crkeyline.ca
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Keyline History
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Yeomans, P.A.. Water for Every farm.
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Keyline Scale of Permanence
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Watershed Basics
Source: http://www.tankonyvtar.hu/hu/tartalom/tamop425/0032_vizgazdalkodas/ch01s02.html
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Water, Silt & Nutrient
Source: Tayler Krawczyk
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Natural concentration of soil moisture.
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Natural concentration of soil moisture.
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Natural concentration of soil moisture.
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Natural Concentration of Soil Moisture. Photo Source: Campbell Wilson. PRI Australia Article.
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On ‘Pooling’ & Drainage
“It is important this result (pooling in the valleys) is treated not a problem of excess moisture to be drained away but as a symptom of water probably being squandered from the upper slopes.”
- Ken Yeoman, Keyline Designs
Source: Tayler Krawczyk
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Classic Keyline Landscape Definitions
Photo Source: HUMA. Understanding the Application of Keyline Design.
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Valley Line
Valley Line
Ridge Line
Ridge Line
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Completing a Keyline Layout on Paper
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By Georgi Pavlov. Available for download with donation at huma.org
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By Georgi Pavlov
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Understanding Classic Keyline Geometry
Source: Doherty, Darren. Regrarians Handbook. 2014
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Understanding Classic Keyline Geometry
Source: Doherty, Darren. Regrarians Handbook. 2014
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Understanding Classic Keyline Geometry
Source: Doherty, Darren. Regrarians Handbook. 2014
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Understanding Classic Keyline Geometry
Source: Doherty, Darren. Regrarians Handbook. 2014
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Source: Doherty, Darren. Regrarians Handbook. 2014
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Photo Source: HUMA. Understanding the Application of Keyline Design.
Simplified Contours
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Photo Source: HUMA. Understanding the Application of Keyline Design.
Focus on Function! Keep it Simple!
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Photo Source: HUMA. Understanding the Application of Keyline Design.
Anomalies
“it is often necessary for compromises with the geometry to have to be made, and that’s okay. It is much better to have a layout that is not entirely correct but that is easy and inspiring to work with, than a layout that is technically correct but that everyone hates working with.” - Georgi Pavlov
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What if there are no classic ‘keyline landforms’? Choosing a guideline using common-sense.
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How is ‘keyline pattern layout’ different than other layout patterns? What are the advantages & dis-advantages?
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Source: Doherty, Darren. Regrarians Handbook. 2014
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Source: Doherty, Darren. Regrarians Handbook. 2014
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Source: Doherty, Darren. Regrarians Handbook. 2014
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Surveying in Practice
! Start with Contour Maps
! Flags / Stakes
! Elevation Survey Tools - Transit Level - Laser Level - A Frame - Water Level (Bunyip)
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What if we do not have contour maps available for our region?
! Demand them from local governments!
! Affordable drone mapping has come!
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Once you have your guideline chosen and layout completed, what techniques are available?
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Keyline Cultivation for Pasture Rejuvenation
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How is a Yeomans Plow Different any old subsoiler?
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About Our Field
Monitoring Program
Sara Duncan, p.Ag
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Results: CONTEXT
PILOT PROJECT to discover: � HOW and WHY Keyline Design can be used
on small farms in our region � Whether the intended BENEFITS are
MEASURABLE � Are INITIAL RESULTS promising?
Opportunity and METHODS for SCALING UP in PRACTICE and ASSESSMENT
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Results: HYPOTHESES
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Results: HYPOTHESIS TESTS
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Ravenhill ● Clay pan at 20 cm ● 10-15% gravel ● Silt loam (till) ● Thin Ah ● weak lower soil development ● Gleying in lower slope positions
Bullock Lake ● 25% stones+ fine gravels ● Silt loam ● No Ah ● Shallow depth to auger
refusal on slope ● Gleying in plots on crest of
hill
Beetnik ● Sandy loam ● 30% cobble -gravel ● Thin Ah ● Well drained in treated area
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Results: PENETROMETER MEASUREMENT
Modified fom public domain: https://commons.wikimedia.org/wiki/File:Penetrometer.jpg
Depth of plough
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Results: ROOTING
Average (Range) Rooting Depth (cm)
Site Year Control Treatment
Ravenhill 2015 17 (9-23) 18 (14-27)
2016 15 (12-17) 15 (11-17)
Bullock Lake
2015 14 (12-16) 17 (13-20)
2016 18 (17-20) 20 (17-25)
Beetnik 2015 - -
2016 11(9-12) 30 (26-38)
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Results: SOIL CARBON
Short-term (<5-10 years) small absolute change in total carbon Active fraction change may be measured more quickly
Total Carbon Active Carbon
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Results: SOIL MOISTURE
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Results: SOIL MOISTURE
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Results: INFILTRATION
● Slightly higher rainfall wetting curve
● Holds moisture longer
● May reduce moisture retention in some situations (⬆evaporation ? Drainage? Under saturated conditions)
● May ⬇infiltration to subsoil by holding moisture in topsoil in other situations?
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NEXT STEPS
! Spring/summer and Fall 2017 ! Penetrometer measurements ! Rooting measurements
! Fall 2017 ! Final soil carbon sample collection ! Final volumetric water content downloads
! Final report December 2017
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OS Design by: Luke Hallam , from Darren J. Doherty
NEXT STEPS
‘Keyline Super Plow’ ?
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‘Keyline SuperPlow’
Source: Darren J. Doherty – Carversville Farm Foundation
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Other Applications of Keyline Patterning: Market Garden Retrofit
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Where & How Has This Been Applied?
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Where & How Has This Been Applied?
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Where & How Has This Been Applied?
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Source: Shepard, Mark. Restoration Agriculture.
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Source: Shepard, Mark. Restoration Agriculture.
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Source: Shepard, Mark. Restoration Agriculture.
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Where & How Has This Been Applied?
Versaland, Iowa. Grant Shultz.
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Where & How Has This Been Applied?
Source: Rancho San Ricardo. Pablo Ruiz Lavalle.
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Where & How Has This Been Applied?
Source: Darren J. Doherty
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Where & How Has This Been Applied?
Source: Ridgedale Permaculture – Richard Perkins
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Ridgedale Permaculture Model, courtsey of Richard Perkins. By Georgi Pavlov.
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Source: HUMA – Georgi Pavlov
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Other Water Management Strategies
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Swales on Contour
Advantages!
- Slows overland flow of water & nutrients
- disturbance creates niche for new plant establishment
- soil loosening- soil warming- planting mound gets above water table- more soil-air interface
Potential Challenges- existing infrastructure/ fences- possible winter springs in unwanted areas- compaction of temporarily saturated soils if
used- blocking cold air drainage- Can create access challenges for machinery
and animals- Large energy output; permanent feature- Does not address soil health in between
swales that is causing excess overland flow
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Swales - Contour (retention) vs. Off Contour (diversion) - Be diligent, plan carefully. Consider advantages and
disadvantages of all options.
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Source: Water Harvesting The Permaculture Way. Geoff Lawton.
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Source: Water Harvesting The Permaculture Way. Geoff Lawton.
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Source: Water Harvesting The Permaculture Way. Geoff Lawton.
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Source: Water Harvesting The Permaculture Way. Geoff Lawton.
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Source: Water Harvesting The Permaculture Way. Geoff Lawton.
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Source: Water Harvesting The Permaculture Way. Geoff Lawton.
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Hatchet & SeedEdible Landscapes + Eco-Design
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Source: Hatchet & Seed.
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Mimic Forest Ecosystems!
Source: Jacke. Edible Forest Gardens.
Source: Hatchet & Seed
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‘Mob’ / Holistic Planned / Management Intensive Grazing
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Silvo-Pasture as Drought-Proofing
Source: Hatchet & Seed.
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Silvo-Pasture as Drought-Proofing
Source: Shepard, Mark. Restoration Agriculture.
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‘Mob’ / Planned / Management Intensive Grazing
Source: Sheldon Firth. Author of "Letter to a Vegetarian Nation"
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Bottomlands: Tile Drainage?
Source: Partners. Conservation Technbology Information Center
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Balancing Tile Drainage & Retention
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Alternative Drainage for Bottomlands
Still trying to keep slopes between 1:100 – 1:200 to slow erosion.
Source: Nature Conservancy
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SOURCE: https://engineering.purdue.edu/watersheds/conservationdrainage/design.html#
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Nature’s Pattern for Aerobic Soil in Wet Environments - ‘Pits & Mounds’
Creates microclimates & micro-topography! Areas of permanent aeration!
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Hugelkultur
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Hugelkultur
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Soil Health
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Living Soil as Microscopic Water Storage
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Source: Stamets. Mycellium Running.
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Source: Hatchet & Seed.
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Soil, Organic Carbon & Water
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IRRIGATION POND DESIGN
Source: Hatchet & Seed.
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Is soil removal needed? – Best to re-use on site ! Check your municipal bylaws
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Sizing Your Pond – How much do you need?
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Use Manufacturer’s Catalogues to determine your expected need!
GPM / GPH / LPM / LPH per emitter X number of emitter. How many zones can the system be divided into? What is max GPM that will be needed at one time?
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Sizing your Pond: Assessing Water Needs
Source: Lewis, B. (Barry), 1942– . Farm dams: planning, construction and maintenance. Collingwood, Australia
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Planning for Evaporation Loss
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Planning for Evaporation Loss
L = .67 x 625mm x 1450 m2 L = 607,188 L 607,188 L of evaporation / 4,000,000 total L = 15% Evaporation Loss Evaporation rate can be up to 100% if pond is too shallow.
Example: approx. 4 ML pond
Equation Source: Lewis, B. (Barry), 1942– . Farm dams: planning, construction and maintenance. Collingwood, Australia
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Source: Lewis, B. (Barry), 1942– . Farm dams: planning, construction and maintenance. Collingwood, Australia
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Siting Your Pond
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Choosing an Experienced Excavation Contractor
- Ensure they have experience building ponds and understand: 1. regulatory regime 2. importance of separating earth materials for later use 3. importance of diligent soil assessment, design & construction 4. risks associated with embankment ponds
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Soil Investigation
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Soil Investigation – Texture Sampling
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Calculating Catchment
Source: Lewis, B. (Barry), 1942– . Farm dams: planning, construction and maintenance. Collingwood, Australia. P. 5
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Calculating Catchment
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Surveying
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Irrigation Pond Design Considerations
https://www.extension.org/mediawiki/files/9/94/Ponds,_Planning,_Design,_Construction.pdf
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! Lewis, B. (Barry), 1942– . Farm dams: planning, construction and maintenance. Collingwood, Australia
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! Lewis, B. (Barry), 1942– . Farm dams: planning, construction and maintenance. Collingwood, Australia
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! Lewis, B. (Barry), 1942– . Farm dams: planning, construction and maintenance. Collingwood, Australia
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! Lewis, B. (Barry), 1942– . Farm dams: planning, construction and maintenance. Collingwood, Australia
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Excavated Pond
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! Lewis, B. (Barry), 1942– . Farm dams: planning, construction and maintenance. Collingwood, Australia
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Wall construction depending on clay content / materials available..
Source:
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What If Insufficient Clay is Found?
Source: Darren Doherty. Regrarians Facebook Page. Installing Bentoliner.
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What If Insufficient Clay is Found?
LLDPE Liner for Eco-sense pond, Highlands, BC. Photo by Ann Baird.
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Products on the Market
! Geotextiles: cushioning, liners, Burp vavles
! Bentonite Clay
! Gleying
! WaterSave PL Plug & Seep (biologically friendly?)
! Soil Floc? (biologically friendly?)
What If Insufficient Clay is Found?
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Sinuous Channel, Silt Traps & Level Sill Spillways
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Spillways
Level-Sill Spillways are preferable to culverted spillways for large ponds. For smaller ponds, culverted spillways like this can work as long as rock rip-rap is added.
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This spillway is less than ideal. Level-sill is recommended. Also, there is an alder tree growing on the pond wall which could puncture the retaining wall. No deep rooted trees should be aloud to grow on a retaining wall. Short rooted plants like grasses and blackberries are suitable.
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Spillway ‘Guideline’ ! Square root of catchment in hectares = width (in meters)
! 10 acre catchment = 4 hectares = 2 meter wide spillway
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Docks
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LUNCH !