男友太凶猛1v1高h,大地资源在线资源免费观看 ,人妻少妇精品视频二区,极度sm残忍bdsm变态

 
  | Home | News| Living in China| MMS | SMS | About us | Contact us|
   
 Language Tips > 2003
DEVELOPMENT REPORT - May 12, 2003: Water Storage Systems
By Jill Moss

This is the VOA Special English Development Report.

Each year, millions of people in Bangladesh drink ground water that has been polluted by naturally high levels of arsenic poison. Finding safe drinking water in that country can be a problem. However, International Development Enterprises has a low-cost answer. This non-governmental organization has developed technology to harvest rainwater.

People around the world have been harvesting rainwater for centuries. It is a safe, dependable source of drinking water. Unlike ground water, rainwater contains no minerals or salts and is free of chemical treatments. Best of all, it is free.

The rainwater harvesting system created by International Development Enterprises uses pipes to collect water from the tops of buildings. The pipes stretch from the buildings to a two-meter tall storage tank made of metal. At the top of the tank is a "first-flush" device made of wire screen. This barrier prevents dirt and leaves in the water from falling inside the tank.

A fitted cover sits over the "first-flush" device. It protects the water inside the tank from evaporating. The cover also prevents mosquito insects from laying eggs in the water.

Inside the tank is a low cost plastic bag that collects the water. The bag sits inside another plastic bag similar to those used to hold grains. The two bags are supported inside the metal tank. In all, the water storage system can hold up to three-thousand-five-hundred liters of water. International Development Enterprises says the inner bags may need to be replaced every two to three years. However, if the bags are not damaged by sunlight, they could last even longer.

International Development Enterprises says the water harvesting system should be built on a raised structure to prevent insects from eating into it at the bottom. The total cost to build this rainwater harvesting system is about forty dollars. However, International Development Enterprises expects the price to drop over time. The group says one tank can provide a family of five with enough rainwater to survive a five-month dry season. International Development Enterprises has more information at its Web site, w-w-w-dot-i-d-e-o-r-g-dot-o-r-g (www.ideorg.org).

This VOA Special English Development Report was written by Jill Moss.

 
Go to Other Sections
Story Tools
 
Copyright by chinadaily.com.cn. All rights reserved

版權聲明:未經中國日報網站許可,任何人不得復制本欄目內容。如需轉載請與本網站聯系。
None of this material may be used for any commercial or public use. Reproduction in whole or in part without permission is prohibited.
 

 

主站蜘蛛池模板: 怀化市| 桃江县| 灵武市| 那曲县| 苏尼特右旗| 南投县| 双江| 通化市| 安国市| 五原县| 虎林市| 民勤县| 海林市| 全州县| 成安县| 武定县| 清徐县| 沭阳县| 鹤岗市| 伊宁市| 洛隆县| 梧州市| 黄浦区| 启东市| 汉寿县| 永清县| 安岳县| 灵寿县| 安多县| 枝江市| 揭西县| 兰西县| 高雄市| 济宁市| 桦南县| 玉溪市| 桦川县| 惠东县| 固阳县| 定安县| 清徐县|