AB731. Memasyarakatkan Rain Garden, Taman Hujan

 
 

Rahma Sarita: assalamualaikum wr wb

HAL:  Memasyarakatkan Rain Garden, Taman Hujan

vienna-wv.com/portal/?s=rain+garden
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Secara umum Rain Garden berfungsi seperti sumur resapan, tapi kalau sumur cenderung bikin orang takut, sedangkan Rain Garden ini justru menambah keindahan pada halaman maupun taman.
Rain Garden lebih menyerupai sistem yang ada di alam, dimana air disaring oleh tanaman dan oleh lapisan di bawah tanaman berupa gravel, pasir, dan lapisan tanah alami. Karena berupa tanaman, jadi memikat serangga seperti kupu-kupu, capung, dan juga burung-burung sehingga menambah keindahan dan suasana alami.
Di Kanada baru mulai populer sekitar tahun 2011, dan menjadi trend di kalangan masyarakat untuk melengkapi halaman rumah, kantor, sekolah, maupun taman lingkungan perumahan, dengan Rain Garden. Pemeliharaan dapat dikatakan mudah, karena tanaman yang digunakan adalah yang tahan tidak disiram.
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www.mtlebanon.org/index.aspx?nid=2037
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www.twp.west-bloomfield.mi.us/departments/raingardens.cfm
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For the first two to three years most plants need deep watering during the dry season to establish healthy root systems. If you have selected the appropriate natives or plants adapted to Western Washington, then the rain garden will need little or no watering after two or three years. However, watering may be necessary during prolonged dry periods even if plants are established. During these periods watch for signs of stress, such as wilting leaves or fading evergreen needles.
In a rain garden the plants and soil work together. The plant roots and soil organisms build soil structure creating channels and pores to soak up and filter water, and allow nutrients and oxygen to flow in to support an abundance of life. While plants help the rain garden absorb stormwater, they also create an attractive landscape for your yard and neighborhood.     county.wsu.edu/mason/nrs/water/Documents/Raingarden_handbook.pdf
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When properly designed and constructed, rain gardens drain rapidly with surface water present for only 1-2 days. Mosquitos take a minimum of about 4 days (many types of mosuitos take several days longer) to become adults after eggs are deposited in water.     county.wsu.edu/mason/nrs/water/Documents/Raingarden_handbook.pdf
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Rain Garden di halaman depan rumah. Sepintas seperti kumpulan tanaman biasa, tapi ini memang diniatkan untuk menyerap air hujan dari atap maupun bagian lain rumah, dengan membuat cekungan yang dilapisi gravel, pasir dan tanah, dan ditanami dengan tanaman pilihan.
foto: water.epa.gov
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Rain Garden di taman lingkungan perumahan. Secara umum untuk menyerap air ke tanah, tapi ada juga opsi berupa kelebihan air akan disalurkan ke drainase.
afbeducation.org/rain-gardens
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How rain gardens work

When it rains, runoff is collected in the rain garden. Layers of gravel filter the water down into the native soil. Any excess water collects in the drain system located below the growing medium soil. Silt and other natural solids (leaves) collect on top of the gardens.

Other pollutants (chemicals and bacteria) are intercepted by the soils and gravels before the filtered stormwater reaches the stormwater system. Properly constructed rain gardens are designed to allow overflow in a large rain event and hold standing water for no more than 72 hours.

The benefits of rain gardens

  • Reduce the quantity of pollutants that run into our waterways untreated
  • Attract birds, butterflies and beneficial insects, such as mosquito-eating dragonflies
  • Complement any landscape and enhance the beauty of the surrounding neighbourhood

www.calgary.ca/UEP/Water/Pages/Water-conservation/Lawn-and-garden/Water-wise-gardening-and-plants/RainGarden.aspx

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Pada gambar diatas ini terlihat sebagian air melewati jalur biasa yaitu ke selokan, dan sebagian lagi yang dari talang air dialirkan ke Rain Garden yang ada di halaman depan rumah.     county.wsu.edu/mason/nrs/water/ Documents/Raingarden_handbook.pdf
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What is a Rain Garden?

  • Rain gardens are one of the simplest and most effective ways to “green” your landscape and manage stormwater.
  • A rain garden is a shallow, planted depression that absorbs the water that flows from your roof, patio or yard, allowing it to drain directly into the soil.
  • A rain garden will reduce stormwater pollution, replenish the groundwater supply and provide a self-irrigating landscape!

    Why Build a Rain Garden?

    • Create an attractive and unique landscaping feature.
    • Slow down stormwater runoff and filter pollution.
    • Prevent runoff from polluting our local rivers and streams.
    • Create habitat for birds and butterflies.
    www.phillywatersheds.org/whats_in_it_for_you/residents/rain-gardens
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www.calgary.ca/UEP/Water/Documents/Water-Documents/Yard_Smart_Rain_Garden.pdf
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Masyarakat di kota Gresham, Oregon, AS, sedang membuat Rain Garden di taman. greshamoregon.gov/city/city-departments/environmental-services/watershed-management/template.aspx?id=6778
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www.cmhc-schl.gc.ca/en/co/grho/grho_007.cfm
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www.raingardennetwork.com/raingardenis.htm
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www.ecoyards.com/services/seattle-rain-gardens
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Ini contoh lain, air dari “gutter” yaitu talang air, tidak disalurkan ke selokan melainkan ke Rain Garden untuk kemudian diserap oleh tanah.     www.watershedcouncil.org/learn/rain-gardens
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Masyarakat di kota Madison, Wisconsin, AS, sedang membuat Rain Garden di trotoar perumahan pada tahun 2005. Dan setelah selesai pada foto bawah.
www.cityofmadison.com
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srrcd.ca/programs/rain-gardens
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www.phillywatersheds.org/whats_in_it_for_you/residents/how-build-rain-garden
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www.riversides.org/rainguide/riversides_hgr.php?cat=2&page=39&subpage=92&subpage2=45
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www.cmhc-schl.gc.ca/en/co/grho/grho_007.cfm
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Sebuah rumah dapat memiliki lebih dari satu Rain Garden seperti terlihat pada gambar ini.     www.teamleaf.org
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www.thisoldhouse.com
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Pada tahun 2012, EPA ( Environmental Protection Agency ) badan resmi pemerintah AS untuk perlindungan lingkungan hidup, untuk pertama kali mengadakan sayembara Campus RainWorks Challenge. Pengumuman pemenang dilakukan pada 22 April 2013. Dari 218 tim peserta yang berasal dari 42 negara bagian AS, yang menjadi pemenang pertama untuk kategori small institution  adalah Illinois Institute of Technology dengan konsep mengolah pedestrian dalam kampus dengan strategi infiltrasi dan penghematan air, serta memanfaatkan wilayah hijau yang ada di kampus. Konsep itu menggunakan pula Rain Garden untuk pengumpulan air dan tempat para mahasiswa bercengkrama di taman.     water.epa.gov/ infrastructure/greeninfrastructure/crw_winners.cfm#Illinois
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Salah satu ciri dari Rain Garden selain tanaman yang dipakai cenderung tanaman yang tidak perlu disiram, juga terdapat celah untuk air masuk ke bagian tanah Rain Garden yang lebih rendah dari tanah sekitar, sepert terlihat pada foto diatas dan dibawah ini.
Foto dari situs University of Nebraska–Lincoln Extention, Institute of Agriculture and Natural Resources.     ianrpubs.unl.edu/pages/publicationD.jsp?publicationId=1547
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drystonegarden.com/index.php/tag/rain-garden/
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Rain Garden di tempat parkir.     www.dcfreeman.com/news.html
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Foto dari situs Washington State University.    
county.wsu.edu/mason/nrs/water/Documents/Raingarden_handbook.pdf
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www.urbanwaters.org/our-facility/rain-garden/rain-garden-creates-natural-filters
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Rain Garden Creates Natural Filters
Rain gardens are shallow depressions landscaped with native plants. They are designed to catch rainwater runoff from impervious surfaces such as roofs, walkways, and driveways. The rain garden on this site collects and filters runoff from the parking lot. Rain gardens:

• Keep pollutants from reaching local waterways.
• Reduce flooding problems.
• Provide habitat for beneficial birds and insects.
• Refresh local groundwater.
• Offer low-maintenance landscaping.

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Rain garden plants must be able to tolerate both standing water and periods of drought. An emergency overflow sends excess water directly into the stormwater system. A thick layer of rain garden soil stores water and nutrients for plants and helps absorb pollutants.
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Jakarta,  26 Januari 2014.
wassalam,

 
 

a.m. firmansyah
sms +62812 183 1538

 
 

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