81
edits
Changes
→干旱
'''潜在的原因''': 由于降雨减少，含水层的补给也变少；人口增加，用水需求也增加；含水层的面积——例如沙量有限；水井在地下水位中不够深；位置不当；管道周围的级配砾石分布不当。
'''To increase resiliency of 增加 WASH system系统的适应性''': Increase volume through construction of groundwater dam; Sink wells/pipes deeper; De-water wells during caissoning within the water table; Construct during the latter half of the dry season; Site in riverbeds that are dry for part of the year, where water remains in the riverbed throughout the dry season; Increase flow by use of porous concrete & perforated pointed steel pipes driven horizontally into the aquifer (riverbed wells) and graded gravel (infiltration galleries & jetted wells); Site in a degrading river section where there is no deposition (infiltration galleries); Put graded gravel around pipes to minimize clogging and increase flow.通过修建地下水坝增加水量；将水井和管道放置在更深的地方；在水位范围内沉箱时使用排水井；在旱季后半段修建；在一年中部分时间干旱的河床中修建，并且河床在旱季时也有水；通过将透水混凝土和多孔尖头钢管水平插入含水层（河床水井）和级配砾石（渗水渠和射流井）中增加流量；在没有沉积（渗水渠）的退化河中修建；在管道周围铺设级配砾石，减少淤积并增加流量。
===Construction, operations and maintenance===
