1.2 Технологийг үнэлэх, баримтжуулах ажилд хамаарах мэдээлэл өгсөн хүмүүс, байгууллагуудын холбоо барих мэдээлэл

Технологи баримтжуулах/үнэлэх ажилд дэмжлэг үзүүлсэн байгууллага(ууд)-ын нэр (шаардлагатай бол)

Africa Sand Dam Foundation (ASDF) - Кени

Технологи баримтжуулах/үнэлэх ажилд дэмжлэг үзүүлсэн байгууллага(ууд)-ын нэр (шаардлагатай бол)

Excellent Development Ltd. (Excellent Development Ltd.) - Англи

1.3 ВОКАТ-аар баримтжуулсан өгөгдлийг ашиглахтай холбоотой нөхцөл

Мэдээллийг хэзээ (газар дээр нь) цуглуулсан бэ?

27/03/2012

Эмхэтгэгч болон гол мэдээлэгч хүн(хүмүүс) WOCAT аргачлалаар баримтжуулсан мэдээллийг ашиглахтай холбоотой нөхцлийг хүлээн зөвшөөрсөн:

Тийм

2.1 Технологийн товч тодорхойлолт

Технологийн тодорхойлолт:

A sand dam is a stone masonry barrier across a seasonal sandy riverbed that traps rainwater and sand flowing down the catchment.

2.2 Технологийн дэлгэрэнгүй тодорхойлолт

Тодорхойлолт:

A sand dam is typically 1 - 5 metres high and 10-50 metres across. When it rains the dam captures soil laden water behind it – the sand in the water sinks to the bottom, whilst the silt remains suspended in the water. Eventually the dams fill with sand - sometimes after only one rainfall or over 1 – 3 seasons. 25 to 40% of the volume of the sand held is actually water. A mature sand dam can store millions of litres of water – refilling after each rainfall providing a year round supply to over 1,000 people.

Purpose of the Technology: Sand dams are a simple, low cost and low maintenance, replicable rainwater harvesting technology. They provide a clean, local water supply for domestic and farming use and are suited to arid and semi-arid areas of the world. It is a solution that is scaleable and has a broader application for use as a rural and game park road crossing to replace less effective culvert bridges.

Establishment / maintenance activities and inputs: Sand dams are the lowest cost form of rainwater harvesting and its robust nature and very low operational and maintenance costs make it particularly suited to remote and poorly served regions. A typical dam using 500 bags of cement would approx be 40 metres in length with a spillway 2 metres above the bedrock. The dam is constructed using stone masonry placed in timber formwork. Such a dam costs approximately USD 11,800 (in 2012 prices). This consists of materials (cement, steel reinforcement, timber, transport) and dam permit USD 8,800 (75%), project management including technical support from skilled local artisans and dam designers USD 2150 (18%) and finance and administration costs of implementing organisation USD 850 (7%). Local people freely contribute their labour to collect rock, sand and water, terrace and protect the immediate catchment and construct the dam. If this contribution was costed and included the cost of the dam would almost double. The maintenance and repair costs of the dam provided it has been well designed and constructed is negligible. Local users are responsible for the management and repair of the dam and its abstraction system. Where a hand pump is fitted, local users fund the repair and replacement of the pump as required. The purchase and repair of petrol powered water pumps which some groups use to irrigate adjacent land is the responsibility of the members of the local group.

Natural / human environment: Because the water is stored within the sand, evaporation losses are very low, the sand filters the water and water-vector diseases such as malaria are controlled. Sand dams provide significant environmental benefits such as aquifer recharge, increased downstream flows in the dry-season, rejuvenation of river ecologies and moderation of floods. As such, it contributes to ecosystem services and climate change adaption.

2.3 Технологийн гэрэл зураг

2.5 Энэ үнэлгээнд хамрагдсан технологийг хэрэгжүүлсэн улс орон/ бүс нутаг/ байршил

2.6 Хэрэгжсэн хугацаа

Байгуулсан тодорхой оныг мэдэхгүй бол баримжаа хугацааг тодорхойл:

• 10-50 жилийн өмнө

2.7 Технологийн танилцуулга

Технологийг хэрхэн нэвтрүүлснийг тодорхойл:

• Гадны төсөл/хөтөлбөрийн дэмжлэгтэйгээр

Тайлбар (төслийн төрөл г.м.):

Sand dams are an ancient technology. Examples are found across the world's drylands although the greatest concentration is found in Kenya. They were introduced to Kenya in the 1950s from India. Dams were pioneered in Machakos and Makueni counties of Kenya by Joshua Mukusya, a visionary farmer and development worker, in 1978. He worked with a range of agencies to develop and implement the technology. In 1990, staff trained by Joshua set up SASOL to pioneer sand dams in the neighbouring county of Kitui. In 2002, Joshua teamed up with Simon Maddrell, Excellent Development's director, to establish Excellent Development Kenya, now Utooni Development Organisation (UDO) to scale up the work. Sadly, in 2011, Joshua passed away. In 2010, Excellent Development formed a strategic partnership with the Kenyan NGO, Africa Sand Dam Foundation (ASDF), to support the wider uptake beyond Kenya. Today, ASDF, SASOL and UDO are the three NGOs with the most experience of building successful sand dams, approx. 130 dams / year, although many other NGOs have adopted the technology.

3.1 Технологийн үндсэн зорилго (ууд)

• access to water

3.2 Технологи нэвтрүүлсэн газрын одоогийн газар ашиглалтын хэлбэр(үүд)

Тайлбар:

Major land use problems (compiler’s opinion): Drylands are characterised by intense and variable rainfall and a lack of vegetative cover. As a result, drylands are prone to droughts, flooding and soil erosion which result in endemic water and food scarcity.

Major land use problems (land users’ perception): “We used to fetch water from Londokwe; we could spend a night to collect water. One way was 3 to 10 km and up to 12 hours or more to go and come back [because of the time taken to queue]. If we could not make it to the river, we would send our children to fetch water. When they went fetching water that would mean they did not go to school. At times people would fight over fetching water from other people’s scoop holes. Scoop holes would be guarded in turns. The gourds [water containers] would be damaged and the water poured down. Children would not go to school [as they needed to] take care of the young ones as the parents went to fetch water. Children would fail to go to school because they were hungry – just because there was no water to cook."
Yikiuuku SHG

3.4 Технологи ГТМ-ийн аль бүлэгт хамаарах вэ

• Ус хуримтлуулах

3.5 Технологийн хамрах талбай

Технологи өргөн дэлгэрсэн эсхийг тодорхойл:

• газар дээр жигд тархсан

Технологи газар нутгийн хэмжээнд жигд тархсан бол түүний эзлэх талбайг дундажаар тооцож тэмдэглэ:

• 1,000-10,000 км2

Тайлбар:

Over 1000 dams have been built to date in these counties, predominantly by 3 organisations: Utooni Development organisation, SASOL and Africa Sand Dam Foundation in an approx. triangular area bordered by Machakos, Kitui and Mitio Andei.

3.6 Технологийг бүрдүүлэх ГТМ арга хэмжээ

Тайлбар:

Main measures: structural measures

3.7 Технологид харгалзах газрын доройтлын төрөл

Тайлбар:

Main type of degradation addressed: Hs: change in quantity of surface water

Secondary types of degradation addressed: Bq: quantity / biomass decline, Bs: quality and species composition /diversity decline, Ha: aridification, Hg: change in groundwater / aquifer level

Main causes of degradation: Heavy / extreme rainfall (intensity/amounts), droughts

3.8 Газрын доройтлоос урьдчилан сэргийлэх, сааруулах ба нөхөн сэргээх

Газрын доройтолтой холбоотойгоор Технологи ямар зорилго тавьсан болохыг тодорхойл:

• газрын доройтлоос урьдчилан сэргийлэх
• Газрын доройтлыг бууруулах

4.1 Технологийн техник зураг

4.2 Техникийн үзүүлэлт/ техникийн зургийн тайлбар

Cross-section of sand dam

Technical knowledge required for field staff / advisors: moderate (The technical skills required to site, design and supervise construction. These skills have and can be developed locally.)

Technical knowledge required for land users: low (Knowledge of local rivers and their flood levels essential. Basic knowledge of stone masonry useful)

Main technical functions: control of concentrated runoff: retain / trap, water harvesting / increase water supply, improvement of water quality, buffering / filtering water

Secondary technical functions: increase of groundwater level / recharge of groundwater, sediment retention / trapping, sediment harvesting, increase of biomass (quantity), promotion of vegetation species and varieties (quality, eg palatable fodder)

Dam/ pan/ pond
Depth of ditches/pits/dams (m): 1-5
Width of ditches/pits/dams (m): 1-2
Length of ditches/pits/dams (m): 5-50

Specification of dams/ pans/ ponds: Capacity 5,000m3

Catchment area: 300 km2m2

4.3 Материал болон зардалд хамаарах ерөнхий мэдээлэл

бусад/үндэсний мөнгөн нэгж (тодорхойл):

Kenyan Shilling

Ам.доллар ба үндэсний мөнгөн нэгж хоорондын хөрвөх үнийг тодорхойл (шаардлагатай бол): 1 USD =:

83.0

4.4 Бий болгох үйл ажиллагаа

	Үйл ажиллагаа	Арга хэмжээний төрөл	Хугацаа
1.	Collection of rock, sand and water	Барилга байгууламжийн	1-3 months before construction
2.	Construct dam	Барилга байгууламжийн	During dry season
3.	Cure dam	Барилга байгууламжийн	For 4 weeks after construction
4.	Terracing and protection of immediate catchment	Барилга байгууламжийн	1-3 months before construction

4.5 Бий болгоход шаардагдсан зардал, хөрөнгийн өртөг

	Зардлын нэр, төрөл	Хэмжих нэгж	Тоо хэмжээ	Нэгжийн үнэ	Зардал бүрийн нийт өртөг	Нийт дүнгээс газар ашиглагчийн төлсөн %
Хөдөлмөр эрхлэлт	Collection of rock, sand and water	Persons/day	220.0	2.5	550.0	100.0
Хөдөлмөр эрхлэлт	Terracing and protection of immediate catchment	Persons/day	100.0	2.5	250.0	100.0
Хөдөлмөр эрхлэлт	Construct dam	Persons/day	500.0	2.5	1250.0	90.0
Хөдөлмөр эрхлэлт	Cure dam	Persons/day	50.0	2.5	125.0	100.0
Тоног төхөөрөмж	Tools	per dam	1.0	300.0	300.0
Барилгын материал	Cement (bag = 50kg)	bags	500.0	9.15	4575.0
Барилгын материал	Steel (12m x Y20 steel bar)	pieces	7.0	45.7	319.9
Барилгын материал	Steel	per dam	1.0	1000.0	1000.0
Бусад	Skilled labour	per dam	1.0	3000.0	3000.0
Технологи бий болгох нийт үнэ өртөг					11369.9

Тайлбар:

Duration of establishment phase: 6 month(s)

4.6 Арчилгаа/ урсгал үйл ажиллагаа

	Үйл ажиллагаа	Арга хэмжээний төрөл	Хугацаа/ давтамж
1.	Inspect and if necessary extend spillway or repair erosion around dam	Барилга байгууламжийн	As required / annually
2.	Maintain hand pump if fitted	Барилга байгууламжийн	As required / annually

4.7 Арчилгаа/урсгал ажилд шаардагдсан зардал, хөрөнгийн өртөг (нэг жилд)

Тайлбар:

In 2012, in Machakos County, Kenya, the cost of materials and technical support for a dam using 250 bags of cement is USD 7,000 and USD 11,700 for a 500 bag dam. The costs in 2.6.1 are based on a 500 bag dam. The volume of a 500 bag dam is approx 140m3 of stone masonry of which 40% is mortar (sand and cement) and 60% is rock. Such a dam will typically be appropriate on rivers 30m wide and with a spillway 3 metres above the bedrock in the river bed level. Costs rise by up to 50% in more remote regions or countries. Sand dams require a lot of hard work. Community members collect the required stones, sand and water, support construction and terrace the land around the dam. If this in-kind contribution is included the costs would rise by 100%. In Kenya, with a long tradition of building sand dams, it takes from 6 to 12 weeks to plan and prepare for construction and 2 days to 2 weeks to build the dam. In other areas, with less experience and/or less community commitment, building a dam may take 6 months or more.

4.8 Зардалд нөлөөлж байгаа хамгийн чухал хүчин зүйл

Өртөг, зардалд нөлөөлөх гол хүчин зүйл:

Each dam is individually designed. The size, design and cost of a dam varies considerably with the size of the river and to a lesser extent, location and transport costs. Sand dams are the world’s lowest cost method of capturing rainwater in dry rural areas by a factor of 3 to 30 times compared to rain water harvesting tanks, earth dams, haffirs and rock catchments.

5.1 Уур амьсгал

5.2 Гадаргын хэлбэр

Гадаргын талаархи тодорхойлолт ба бусад тайлбар:

Land forms: Sand dams only suit seasonal rivers with sufficient sandy sediment and an accessible bedrock

Altitudinal zone: Also 1,001-1,500 m a.s.l.

Slopes on average: Also moderate

5.3 Хөрс

Боломжтой бол хөрсний бүрэн тодорхойлолт, боломжит мэдээллийг өгнө үү, жишээ нь хөрсний төрөл, хөрсний урвалын орчин/хүчиллэг байдал, катион солилцох чадавхи, азотын хэмжээ, давсжилт г.м.

Soil water storage capacity: The aquifer behind the dam must consist of sandy sediments with a high porosity and drainable porosity

5.4 Усны хүртээмж ба чанар

Усны чанар, нөөцийн талаархи тайлбар ба бусад тодорхойлолт:

Availability of surface water: Sand dams only suit seasonal rivers

Water quality (untreated): Good drinking water because the sand filters the water. Water abstracted through an infiltration gallery has a high bacterialogical quality but water is often used for small scale irrigation and livestock watering.

5.5 Биологийн олон янз байдал

Биологийн олон янз байдлын талаархи тайлбар ба бусад тодорхойлолт:

Sand dams rejuvenate riverine ecologies and increase local biodiversity

5.6 Технологи нэвтрүүлсэн газар ашиглагчдын тухай мэдээлэл

Газар ашиглагчдын бусад шинж чанарыг тодорхойл:

Land users applying the Technology are mainly common / average land users

Difference in the involvement of women and men: The dams are built by members of registered self-help groups, typically 50 members / group and two-thirds women. The primary concerns of these groups tend to be food and water. Sand dams provide for people, livestock and crops. Water collection and farming are primarily undertaken by women in Kikamba culture and hence women have the greatest vested interest to imrpove food and water availability. Many men migrate away from the area in search of work.

Population density: 50-100 persons/km2

Annual population growth: 2% - 3%

Off-farm income specification: This varies considerably, but most self-help group members are subsistence farmers

5.7 Технологи нэвтрүүлсэн газар ашиглагчийн өмчилж буй, эзэмшиж буй, түрээсэлж буй эсвэл ашиглаж буй (ашиглах эрх) газрын талбай

5.8 Газар эзэмшил, газар ашиглах эрх, ус ашиглах эрх

Газар өмчлөл:

• төрийн

Газар ашиглах эрх:

• нэгдлийн хэлбэрээр (зохион байгуулалттай)

Ус ашиглах эрх:

• нэгдлийн хэлбэрээр (зохион байгуулалттай)

Тайлбар:

Legal agreements for construction and access between the self-help group and the owners of land adjacent to the dam and registering the dam and its associated water rights by the self-help group with the Kenyan Water Resources Management Authority (WRMA) is vital to safeguarding water rights, controlling water and sand abstraction, formalising the authority of the self-help group to levy water tarriffs if appropriate and ensuring there is open access to all to water from scoop holes.

5.9 Дэд бүтэц, үйлчилгээний хүртээмж

6.1 Технологийн талбайд үзүүлсэн нөлөө

Нийгэм-эдийн засгийн үр нөлөө

Үйлдвэрлэл

Усны хүртээмж ба чанар

Орлого, зарлага

Нийгэм-эдийн засгийн бусад үр нөлөө

Нийгэм-соёлын үр нөлөө

Экологийн үр нөлөө

Усны эргэлт/ илүүдэл

Хөрс

Биологийн олон янз байдал: ургамал, амьтан

Уур амьсгал болон гамшгийн эрсдлийг бууруулах

6.2 Технологийн талбайн гадна үзүүлсэн үр нөлөө

6.3 Технологийн уур амьсгалын өөрчлөлт, цаг агаарын гамшигт үзэгдэлд өртөх байдал ба эмзэг байдал (газар ашиглагчийн бодлоор)

Уур амьсгалын аажим өөрчлөлт

Уур амьсгалын аажим өөрчлөлт

	Улирал	Уур амьсгалын өөрчлөлт/экстрим үзэгдлийн төрөл	Технологи түүний нөлөөг хэрхэн бууруулж байна?
жилийн дундаж температур		Өсөлт	сайн

Уур амьсгалаас хамаарах аюул (гамшиг)

Цаг уурын гамшигт үзэгдэл

	Технологи түүний нөлөөг хэрхэн бууруулж байна?
орон нутгийн аадар бороо	сайн
орон нутгийн салхин шуурга	сайн

Уур амьсгалын гамшиг

	Технологи түүний нөлөөг хэрхэн бууруулж байна?
ган гачиг	сайн

Усзүйн гамшиг

	Технологи түүний нөлөөг хэрхэн бууруулж байна?
усны үер (гол)	сайн

Уур амьсгалд хамаарах бусад үр дагавар

Уур амьсгалд хамаарах бусад үр дагавар

	Технологи түүний нөлөөг хэрхэн бууруулж байна?
цргалтын хугацаа багасах	сайн

Тайлбар:

The capacity of the spillway would be increased to control peak flood events

6.4 Өртөг ба ашгийн шинжилгээ

Бий болгох зардалтай харьцуулахад ямар ашиг өгсөн бэ (газар ашиглагчийн бодлоор)?

Арчилгаа/урсгал зардалтай харьцуулахад ямар ашиг өгсөн бэ (газар ашиглагчийн бодлоор)?

Тайлбар:

The very low cost of operating and maintaining sand dams means they are well suited to remote, poorly served regions. Because it is a low cost technology that requires a major community contribution and the knowledge and skills of locally trained artisans, it’s a solution particularly suited to community ownership and self-supply. This contributes to effective implementation.

6.5 Технологи нэвтрүүлэлт

Технологи нэвтрүүлсэн хүмүүсээс хэд нь өөрийн хүчээр технологийг хэрэгжүүлсэн бэ, өөрөөр хэлбэл гадны тусламж дэмжлэг авалгүйгээр?

• 0-10%

Тайлбар:

100% of land user families have adopted the Technology with external material support

Comments on acceptance with external material support: Sand dams require external material support including technical advice to correctly site, design and construct

There is a little trend towards spontaneous adoption of the Technology

Comments on adoption trend: There is some evidence of spontaneous adoption amongst development agencies working in regions suited to sand dams.

6.7 Технологийн давуу тал/боломжууд

Газар ашиглагчдын тодорхойлсон давуу тал/боломжууд
“I will be able to rent a plot of land near to the sand dam and grow vegetables (tomatoes, peppers, and French beans). My animals will also be healthy because they will always be able to drink here, even during the droughts.” Mauwa Maingi, self-help group member, aged 87, 2010
Mbatha Mbuli, 83. "My family collects water from a near-by well, about ½ Km away, but the water is very salty. It takes one hour to collect water, and needs 6 trips to fetch enough to last the day. There is a pipeline nearby but we must pay 2 shillings per 20 litres. I planted 9 different crops last year, but only 2 survived. I wanted to work with Excellent on this project because I had heard that the projects you support help communities like us to build sand dams, grow trees and create seed banks. I would like to grow trees like Neem in the future and a sand dam here will really help with that. Excellent shares in the interests of the community and they listen to the community and take direction from us"
Stephen Hussey, Dabane Trust, 2011 “Dabane has made its name by getting water out of sand rivers – Our next step is to ensure we don’t over abstract – the answer to that, especially upstream, is sand dams. Without a doubt.”
Milka Mutunga, Kilili Catchment SHG, Kenya 2009-10 "The distance that I used to travel in order to fetch water has been reduced..now I am able to plant more vegetables close to my home. I have learnt how to dig terraces which have helped in increasing the yields that I harvest from my farm..If this is not development then I do not know what development means"
Kimanthi Ngovi, Yikiuuku SHG “The sand dams have done an incredible work for us – water availability at a shorter distance has helped me in saving time for other activities. When water was a long way away I had to get time to collect water in one day and dig terraces on the other day. Today I can fetch water and dig terraces on the same day.”

Эмхэтгэгч, бусад мэдээлэл өгсөн хүмүүсийн өнцгөөс тодорхойлсон давуу тал/боломжууд
Sand dams provide a safe, reliable, year round, local supply of water for people, crops and livestock in water scarce environments How can they be sustained / enhanced? The very low cost of operating and maintaining sand dams means they are well suited to remote, poorly served regions. Community ownership is critical to their effective management.
Sand dams save farmers hours every day that they can invest in improving their farms to grow more food and create the potential for farmers to irrigate trees and crops, water livestock and generate an income How can they be sustained / enhanced? Don’t build a sand dam in isolation. An independent evaluation in 2010 of 2 sand dam programmes found the long term impacts on poverty, food security and incomes were greatest when sand dams were integrated within a wider community development programme aimed at improving food production, livestock management and land management practice.
Because it is a low cost technology that requires a major community contribution and the knowledge and skills of locally trained artisans, it’s a solution particularly suited to community ownership and self-supply. This contributes to effective implementation. How can they be sustained / enhanced? Don’t short cut community ownership. Communities better understand and are able to implement solutions to their problems if they are central to the planning of the solution. Genuine community commitment and ownership from initial planning to on-going management is vital to realise the intended benefits and full potential created by a dam. Legal registration and agreements to safeguard community access and water rights help this.
Sand dams provide significant environmental benefits such as aquifer recharge, increased downstream flows in the dry-season, rejuvenation of river ecologies and moderation of floods. As such, it contributes to eco-system services and climate change adaption. How can they be sustained / enhanced? Support terracing, tree planting and conservation farming in the wider catchment. This conserves soil and water on farms, increases aquifer recharge and base flows into the dam and reduces the amount of silt in the sand dam aquiver. Research and disseminate evidence of these benefits and the value of these eco-system services
The technology is scaleable and has a broader application for use as a rural and game park road crossing to replace less effective culvert bridges. How can they be sustained / enhanced? In order to upscale this solution, there is a need for greater awareness and advocacy of the technology and its benefits amongst these groups. Nothing generates interest in sand dams more than exposure to successful examples

6.8 Технологийн дутагдалтай/сул тал/аюул болон тэдгээрийг хэрхэн даван туулах арга зам

Эмхэтгэгч, бусад мэдээлэл өгсөн хүмүүсийн өнцгөөс тодорхойлсон сул тал/ дутагдал/ эрсдэл	Тэдгээрийг хэрхэн даван туулах вэ?
Although sand dams are technically replicable, their application in new contexts requires careful understanding and consideration.	Excellent Development has developed a framework tool to help agencies identify the political, economic, social, technical, legal and environmental factors that should be taken account of when introducing sand dams to a new context.
Sand dams require the technical knowledge and skills of local artisans in order to correctly site, design and construct them	The technical barriers to adoption are low: The technical skills required have and can be developed locally. Learning exchanges between implementing organisations and developing technical manuals and resources aids this learning
This is a drylands solution. Sand dams can only be built on seasonal rivers with sufficient sandy sediment and where the bedrock or impermeable layer is accessible in the river bed.	Increase awareness of the criteria that determine the technical suitability of a site. Use simple field tests, such as sediment seiving and probing, to assess potential sites and to map the potenial application of sand dams.

7.2 Ном, хэвлэлийн ишлэл

Гарчиг, зохиогч, он, ISBN:

A practical guide to sand dam implementation: Water supply through local structures as adaptation to climate change, the RAIN Foundation, 2008

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www.sanddam.org, free

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Films on sand dams and related conservation technologies and approaches, Excellent Development

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www.excellentdevelopment.com/film,www.youtube.com/user/thisisexcellent free

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Website with selected bibliography and resources on sand dams and related water technologies

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www.samsamwater.com/library, free

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Sand Dam Advocacy Brochure, Excellent development, 2011

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www.excellentdevelopment.com

Гарчиг, зохиогч, он, ISBN:

Be buffered website including Managing the Water Buffer for Development and Climate Change Adaptation. Groundwater recharge, retention, reuse and rainwater storage. Steenbergen F. van and A. Tuinhof. (2009) which includes sand dams

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www.bebuffered.com/3rbook