HCOV_0200, Event area of the Kempens Aquifer system

Flanders is composed of an alternation of aquifers (sand, gravel, chalk, rock, etc.) and regionally occurring non-aquifers (e.g. clay). The sequence of these aquifers and aquitards has its own coding in Flanders: hydrogeological Coding of the Subsoil of Flanders (HCOV coding). The HCOV coding is composed of main hydrogeological units, sub-units and basic units. The main unit brings together a sequence of geological layers which have broadly the same hydrogeological characteristics and thus form a whole. The main hydrogeological unit Kempens Aquifer system consists of all Tertiary and Quartarian deposits above the Boomse clay layer. Geographically, these layers occur mainly in the Kempen basin. This concerns the zone to the north-east of the day summer of the Formation of Boom. This hydrogeological zone consists mainly of a succession of several Tertiary and Quartarian sand, alternating with local clay layers, whether important or not.佛兰德斯地区的地下地层由含水层（aquifer）（砂、砾石、白垩、岩石等）与区域分布的非含水层（如黏土）交替组成。该区域内的含水层与弱透水层（aquitard）序列拥有专属编码体系：佛兰德斯地下水文地质编码（Hydrogeological Coding of the Subsoil of Flanders，简称HCOV编码）。HCOV编码由水文地质主单元、次级单元与基本单元三级构成。水文地质主单元整合了一系列水文地质特征大体一致的地质地层，共同构成一个完整单元。其中核心水文地质主单元为肯彭含水层系统（Kempens Aquifer system），涵盖了博姆黏土层（Boomse clay layer）之上的所有第三纪与第四纪沉积地层。从地理分布来看，这些地层主要分布于肯彭盆地（Kempen basin）内，对应博姆组露头的东北侧地带。该水文地质带主要由多层第三纪与第四纪砂层依次叠置而成，并与不同规模的局部黏土层交替分布。