pdc+++ module3 class 4 water
TRANSCRIPT
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M3.4 pdc+++M3.4 pdc+++Water is another vital element & normally very badly managed in our
society, due to our usual ignorance of its importance, characteristics & inter-relationships with other elements.
In this class we learn of harvesting systems for this vital substance, how to re-connect ourselves with the water cycle, the strategies of "slow it, spread
it, sink it"
& we see various examples where a good management of water has totally changed the system. Small re-designs can improve the whole
environment a great deal, & this is especially true with water re-designs.
of the
an integral exploration
PDC++ +
M3.4 WATER
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wangari maathai
"I have seen rivers that were brown with silt
become clean-flowing again ...
The job is hardly over, but it no longer seems
impossible."
From the article "Planting the future", The Guardian, 16 February 2007.
Kenia 1 april 1940 - 25 september 2011
"Until you dig a hole,
you plant a tree, you water it and make it
survive, you haven't done
a thing.
You are just talking."
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• An EgoRestoration Project
• Storage in Soil & Vegetation
• Swales & Diversion Channels
• Rain Water Collecting
• Dams & Reservoirs
• Mythology & Culture of Water
an integral explorationM3.4 WATER
Earth Works
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•• Good drainage & irrigation systems (salinization) Good drainage & irrigation systems (salinization) Water storage Water storage (depend more on rainwater than sub-terrenean water)(depend more on rainwater than sub-terrenean water)
Slow it, Spread it, Sink itSlow it, Spread it, Sink it
Cover the soil (roots in the earth)Cover the soil (roots in the earth)Regeneration & Reforestation of areas in danger of erosionRegeneration & Reforestation of areas in danger of erosion
•• Large scale: cover vegetation, green manures Large scale: cover vegetation, green manures •• Small scale: composts, vegetation wastes, mulchingSmall scale: composts, vegetation wastes, mulching
•• Foliar application & Compost TeasFoliar application & Compost Teas
The ABC of RegenerationThe ABC of Regeneration
C. Control of WaterC. Control of Water
A. hAlt the ErosionA. hAlt the Erosion
B. Biomass & BugsB. Biomass & Bugs
STOP the destructionSTOP the destruction
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• An EgoRestoration Project
• Storage in Soil & Vegetation
• Swales & Diversion Channels
• Rain Water Collecting
• Dams & Reservoirs
• Mythology & Culture of Water
an integral explorationM3.4 WATER
Earth Works
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As Brock likes to ask,
“Do you know where your watershed is tonight?”
An EgoRestoration Project
Brock Dolman
The health of our waters is the principal measure of how we live on the land. (Luna Leopold)
"We're probably known around the
universe as that really noisy
blue planet where everybody
pees in their water."
(Will Durst)
wonderful lectures by him in our e-book
www.PermaCultureScience.org
M3.4 - Water
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“The critical head-waters (human brain) are in need of an ego-restoration project”
and the “lifeboat in this restorative journey is our watershed.”
A watershed carries water "shed" from the land after rain falls and snow melts.
The important thing about watersheds is: what we do on the land affects water quality for all communities living downstream.
They are natural BioRegions
An EgoRestoration Project
Brock Dolman
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Life BoatsWe all live in life-boats -they are our Watersheds
conoces a tu
cuenca?
Brock Dolman
An EgoRestoration Project
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Poetically, our society must engage in a “Reverential Rehydration Revolution,”
Brock Dolman
An EgoRestoration Project
Regenerative Rehydration
Hope lies in world-wide “water literacy” and establishing a water management commitment to the four R’s of “Conservation Hydrology: Receive, Release, Recharge, and Restore.”
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Brock Dolman
An EgoRestoration Project
by adjusting our development and water management patterns away from the “problem-causing system of: Pave it, Pipe it, Pollute it”
to a “solution-based system of: Slow it, Spread it, Sink it.”
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only 0,007%
can be
considered
drinking water
Planet Earth >> Planet Water
3/4 of planet is covered in waterDomestic use of water (in litres per person per day)
Gambia 3Tanzania 8Bangladesh 14Nigeria 24India 31China 59Holland 67Syria 98Mexico 129Germany 273Japán 376Canada 431USA 555Estimations based on “The World’s Water 2000-2001”, by Peter H. Gleick
50 l/dayrecommended
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snow & ice (solid water) condensation water vapour
oceans & seas (salt water)evaporationprecipitationrivers, lakes & underground
waters (sweet water)
it is important to understand how aquifers work
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Springs
It is any natural situation where water flows to the surface of the earth from underground.
A spring is a site where the aquifer surface meets the ground surface.
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• An EgoRestoration Project
• Storage in Soil & Vegetation
• Swales & Diversion Channels
• Rain Water Collecting
• Dams & Reservoirs
• Mythology & Culture of Water
an integral explorationM3.4 WATER
Earth Works
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the Hydrological Cycle - cycles & purifies water continuously
Precipitation
Evaporation
Cloud
Transportation of vapour
Evaporation
Snow Transpiration
Sub-terrenean flow of water
Percolation
Superficial Storage
Sea
One of Nature's priceless services
M3.4 - The Science of Water
www.PermaCultureScience.org
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Plants are fertility (water) indicators
value the marginal
(Edge)
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temperature down 3-5 degrees Ctemperature down 3-5 degrees Cair humidity up 10%air humidity up 10%
cloud cover up 11.5%cloud cover up 11.5%rainfall up 25%rainfall up 25%
137 species of birds (up from 5)137 species of birds (up from 5)9 species of primates9 species of primates
3000 people getting income3000 people getting income
Class 3.2 on Regeneration Class 3.2 on Regeneration (Borneo)(Borneo)
Forests CREATE the rainForests CREATE the rain
so vegetation is a so vegetation is a pro-sumer of waterpro-sumer of water
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0.003 % of the planet's water is contained in plants, animals and the
soil
• & most water soil erosion is prevented by vegetation (covering & holding the earth in place)
• Of any water that precipitates (condensed, rain or snow) only 30-40% finds its way to rivers or underground water deposits
• Most of it is taken up by plants & humus in soils >> the most mini-max water storage is to get harvested water directly into (good) soil with dense vegetation
"you can "you can think of a think of a forest as forest as a mass of a mass of vegetatiovegetatio
n n
... or you ... or you can think can think of it as a of it as a
lake"lake"
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• An EgoRestoration Project
• Storage in Soil & Vegetation
• Swales & Diversion Channels
• Rain Water Collecting
• Dams & Reservoirs
• Mythology & Culture of Water
an integral explorationM3.4 WATER
Earth Works
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Are ditches that follow the contour and in which there is no flow. Their function is first to stop the water and then to soak it into the
landscape.Planting is usually done in or alongside, to use up the water collected.Planting is usually done in or alongside, to use up the water collected.
Imagen de “Perm
aculturre a Designer’s M
anual”
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there are some great videos on earth-works by Jeff Lawton in the e-book:
www.PermaCultureScience.org
M3.4 - Water
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re-hydrated landscape
can result in new springs downstream
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The distance between swales will depend on the slope and the climate
some rough guidelines
SLOPE DISTANCE 2% 30 m(eters) 10% 20 m 20% 14 m 45% 4 m
native acacias
herbs or grass cutting crop (for straw)
wildlife
infiltration area with straw
cucubits, beans, cassava, bananas
/ other water-demanding crops
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how to you mark the contour?
< With an A-frame Level
in order to ensure we dig aswale and not a diversion channel?
when the A-frame is level, then both legs are resting on the
contour, can mark with pegs & move along to find next point on the contour (also prepare lots of
pegs to mark landscape)
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how to you mark the contour?
With a Bunyip Water Level >
Used in building, can also find difference in
levels very easily, including around corners.
Can be used to find same level also, to
mark swales.
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how to you mark the contour?
With a Surveyor's Level >
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BE CREATIVE! observe the landscape, swales have to be DESIGNED like anything else (no 'standard recepies' please)
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Class 3.2 on Regeneration (US Dust Class 3.2 on Regeneration (US Dust Bowl)Bowl)
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Diversion Channels
Unlike swales, diversion channels connect a stream to a dam, orcollect runoff water and carry it to places of
storage ... and they can need a slope in order to carry water along a landscape
(not soak it into the landscape, which is the function of swales)
Imagen de “Perm
aculturre a Designer’s M
anual”
FLOW
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diversion channels come in all types & often have 'doors' for optimal flow
control
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There are many shapes. The objective is not to collect water but regulate the streams flows
Imagen de “Perm
aculturre a Designer’s M
anual”
Check Dam
Stream
Boomerang shape wallContour diversion channel
Dry bed ofthe stream
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this one in Fuerteventura
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the 'gabias' of Fuerteventura
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the 'gabias' of Fuerteventura(Canary Islands) are a
combination of desviation channels & 'mega-swales'
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an essentially dry landscape, but when it rains it rains hard & ingenious water-harvesting systems have evolved to work
with nature
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edges traditionally made with camel-power & planted with palm-
trees
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slow sedimentation layers stones, sand & clays in that
order
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& a crust of very fine clay forms which lowers
evaporation
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no more watering is needed (these fields have
a lot of water stored in the soil)
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today most of the palm-tree edges have
disappeared (they shaded & held the
gabia walls in place)
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4466
A water-harvesting technique we saw before, also from
Fuerteventura
Antonio
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4477
Antonio is an organic farmer who is continuing his family's tradition,
here
this is his gabia field in production
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4488
notice the fine clay 'crust mulch', lowering evaporation
& mini-swales for shading
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abandoned gabias keep working ... decades later
(advantages of passive systems & good earth-works)
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• An EgoRestoration Project
• Storage in Soil & Vegetation
• Swales & Diversion Channels
• Rain Water Collecting
• Dams & Reservoirs
• Mythology & Culture of Water
an integral explorationM3.4 WATER
Earth Works
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Imag
en d
e: T
exas
Gui
de to
Rai
wate
r Har
vest
ing
Main components of a rainwater collection system
catchment surface / roof
channels / tubing
conduction & water treatment surplus out
storage tank
To calculate tank volume needed, eg.
roof area (m2) x rain mean (l/m2) = total litres (l)then compare with water
requirements in dry season
RainGardens - store water directly in soil
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Total roof areahere is
9x6.5 = 58.5m2
Any paved area (eg. roads, car-parks, patios, etc.)
can act as good rainwater collection areas
< Rainwater collection tank from road above farm, in La Casita Verde, Ibiza
(2 or 3 of these fill up every winter)
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Typical Canarian rain-water collection system (water tank covered)
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Be creative & use whatever containers you can to store precious rain-water
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Methods for diverting the 1st rainwater from a roof. These Methods for diverting the 1st rainwater from a roof. These wash the roof & are redirected to uses that don't require wash the roof & are redirected to uses that don't require
clean water.clean water.
Imagen de “Permaculturre a Designer’s Manual”
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Some filters or systems for rejecting
leaves, insects, etc.
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Crystal Waters: water storage on a large scale
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Barcelona: House of Sr. Joan Carulla
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Barcelona: House of Sr. Joan Carulla
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• An EgoRestoration Project
• Storage in Soil & Vegetation
• Swales & Diversion Channels
• Rain Water Collecting
• Dams & Reservoirs
• Mythology & Culture of Water
an integral explorationM3.4 WATER
Earth Works
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Very useful for fire control, animals and limited irrigation. It's the kind dam higher in the landscape that can be
filled by the runoff from the hills.
Imagen de “Perm
aculturre a Designer’s M
anual”
Diversion channel that catch the runoff Water and take it to the damThe channels have a slope of
1:250-500
“saddle shape” dam
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Imagen de “Perm
aculturre a Designer’s M
anual”
Keyline system doesdrought-proof farms with low operating costs and maintenance.
The road is in the range S located along a principal a ridgeNotice how the valleys and primary ridges are inclined to Redbank Creek to the north
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Yeomans Keyline plow for soil conditioning
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Chisel plough
used in compacted pasture soils
3 or 4 sequences with increasing
depth
creates deep (18cm) humus soils
over 1 - 2 growing seasons
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cuts along contour
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all of these techniques
for
slowing, spreading & sinking water into
the landscape
are often used in the same piece
of land
Slow it, Spread it, Sink it
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The same uses as the saddle dam
Imagen de “Perm
aculturre a Designer’s M
anual”Diversion Channels
drainage channels (to the next dam)
Cross section following the main ridge
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If used in a series of dams is not necessary drainage canal and the remainder goes to the next dam an eventually to the stream. Adapted for irrigation
in lower slopes.
The keyline (dashed line) connects the key points in the
primary valleys
Imagen de “Perm
aculturre a Designer’s M
anual”
Keypoint DAM
Cross section
InputDiversionchannel
Drainoutput
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It is the dam of "engineers". It can affect fish migration and have difficulty draining. Only works well in the
keyline system as part of a system of dams connected to each other.
Imagen de “Perm
aculturre a Designer’s M
anual”
Barrier dam
Stream
drainage
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Useful in slopes of 8º or less as part of a interconnected dams system
Imagen de “Perm
aculturre a Designer’s M
anual”
Cross section Contour dams
Concave wall
Convex wall
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To contain water pumped by a windmill. Provides a low flow in flat areas. Can be filled with a pipe from a big roof
or parking lot
Imagen de “Perm
aculturre a Designer’s M
anual”
Ring dam over a flat area (circular on a map)
“turkey nest” dam
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The walls of earth and concrete or wire baskets can hold "mud fields", make sprinkle water and reduce the amount
of silt in streams
Imagen de “Perm
aculturre a Designer’s M
anual”
Silt
dam for the accumulation of silt
Stream bed
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A dam of this type with 1-3m wall perpendicular to a stream can create enough flow rate for a hydraulic ram
Imagen de “Perm
aculturre a Designer’s M
anual”Control dam for a watermill or a hydraulic ram
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Banana Circle
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Banana CircleObjectives:1) easy, large production in small space2) multi-crop system3) use up organic waste, eg. banana leaves4) water storage 5) easy access for harvesting6) neat system for banana production7) gray water deposit
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• An EgoRestoration Project
• Storage in Soil & Vegetation
• Swales & Diversion Channels
• Rain Water Collecting
• Dams & Reservoirs
• Mythology & Culture of Water
an integral explorationM3.4 WATER
Earth Works
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The work of a land-
designer is to
to slow, spread &
sink water in the
landscape
in order to re-hydrate & restore the
soil for maximum vegetation cover (& fertility) possible
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Watershed
Headwaters The work of a culture-designer
is to
to re-design the culture of water in the society
in order to re-hydrate &
restore
the collective
intelligence of the whole
system
water as a sacred resource
(would be tabú to dirty it, to waste it, to dis-respect
it's cycles in any way)
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Brock Dolman
An EgoRestoration Project
ReStoryAtion: what is the creation myth that holds
power for you?
Is the planet a commodity or a community?
Are you part of the solution or part of the
precipitate?
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• An EgoRestoration Project
• Storage in Soil & Vegetation
• Swales & Diversion Channels
• Rain Water Collecting
• Dams & Reservoirs
• Mythology & Culture of Water
an integral explorationM3.4 WATER
Earth Works