Changes

洪水控制/疏导水池

148 bytes removed, 23:49, 27 August 2015
Suitable conditions
这是一项利用洪水的技术,通过修建引水建筑物和运河将河水疏导至一大片区域,从而补给地下水和池塘、灌溉土地和牧场。这个技术的原理是当少量的水以最慢的速度流过土地时不会破坏土壤表面。这包括[[Irrigation_-_Spate_irrigation|漫灌]],也包括通过运河将河水疏导至田地的标准灌溉渠方法。
===Suitable conditions适宜条件===Site in areas of high volume and intensity river flows where conventional irrigation structures are not feasible (spate systems should probably be promoted in areas where the practice is already in use).水流量大、水流湍急,并且不适合传统灌溉方式的地方(漫灌系统应该在已经应用的地方大力推广)。
{| border="1" cellpadding="5" cellspacing="0" align="center"
|-
! width="50%" style="background:#efefef;" | Advantages优势! style="background:#f0f8ff;" | Disadvantages劣势
|-
| valign="top" | - Minimum land preparation is needed, so is very cost-effective compared to other infiltration methods 不需要对土地进行太多准备,因此比其它渗入方式性价比更高 <br>- Most of the sediment load in the river water will settle on the land, e.g. 70大部分河流中的沉淀物(如70% – this can be advantageous for agriculture )会沉淀在土地上,有益于农业 <br>
- Good for infiltrating runoff water – measurements in Iran showed that 83.5% of the river water was infiltrated<br>
| valign="top" | - Large surfaces of land have to be made available for it to work <br>
- Unintentional negative impacts on water downstream when not carefully designed. Especially when the floodwater never reaches the sea – in this case, all water is already allocated in the basin and withdrawal in one place will be more likely to negatively affect another. <br>
|}
 
===Resilience to changes in the environment===
81
edits