Browsing by Author "Cang, Shu Long"

Now showing 1 - 2 of 2
  • Publication
    Publication
    Groundwater overdraft and the impact of artificial recharge on groundwater quality in a cone of depression, Jining, China
    (taylor and francis, 2009-12-03) Ong'or, Basil T. I.; Cang, Shu Long
    Groundwater overdraft has led to cone of depression formation in Jining City, China. This paper investigates spatial groundwater overdraft severity by an index and Geographic Information System (GIS) method, and impact of artificial recharge on groundwater quality, by a 3-D groundwater flow finite difference numerical model code MODFLOW, and a solute transport model code MT3D. Hydrogeological and anthropogenic factors were evaluated. Groundwater concentration of chloride ions and total hardness (THD) as a result of artificial recharge were evaluated. The hydro-geochemical formation of the aquifer and recharge water quality greatly impact the groundwater quality. The recharge water must be within high groundwater quality standards.
  • Publication
    Publication
    Groundwater overdraft vulnerability and environmental impact assessment in Arusha
    (Springer, 2006-07-11) Ong’or, Basil T. I.; Cang, Shu Long
    A simple approach is proposed for identifying areas vulnerable to groundwater overdraft. The methodology utilizes GIS techniques to analyze and evaluate controlling factors in areas with little data. The proposed methodology was applied in Arusha. Water demand in Arusha Municipality and its environs has increased to about 5.3% annually since 1999. Groundwater levels have declined. The aquifer hydrogeological variables were evaluated for impact to potential groundwater overdraft by overlay and index techniques. The spatial distribution of overdraft vulnerability was discussed. The northwestern part of Arusha is the most vulnerable to overdraft and possible serious environmental impacts. The Loruvani area has the most potential for aquifer development due to its permeability, high recharge rate, massive aquifer thickness and low drawdown.