Impact of water harvesting techniques on soil and water conservation: a case study on a micro catchment in southeastern Tunisia

A Methodology to Assess and Evaluate Rainwater Harvesting Techniques in (Semi-) Arid Regions

“…C: The mean annual runoff coefficient (-); equal (0.18) based on the simulations done by Schiettecatte et al [32].…”

“…Depending on effective rainfall and runoff rates, the ratio between the catchment (impluvium) and cropping (terrace) area (Ca/C) can be determined. According to Schiettecatte et al [32], the minimum ratio (Ca/C) "impluvium area/terrace area" (design) can be calculated by:…”

“…where WR is the annual crop water requirement, P is the average annual precipitation (mm) for the period 1979-2004, and C is the average annual runoff coefficient (0.18) of dry soil and wet soil which was measured by Schiettecatte et al [32]. For olive trees, the WR is estimated to be 500 mm¨y´1 [32].…”

“…For olive trees, the WR is estimated to be 500 mm¨y´1 [32]. Catchment area (impluvium) and cropping area were delineated with GPS in the field, and the areas were calculated using ArcGIS.…”

The Nature of Rainfall at a Typical Semi-Arid Tropical Ecotope in Southern Africa and Options for Sustainable Crop Production

“…The information may also be critical in designing appropriate water storage facilities for supplementary irrigation in future. In order for such facilities to be efficient, they need to be constructed in proportion to the amount of water that can be expected during a rainfall event (Schiettecatte, 2005). However, the chances of implementing such strategies in many parts of Africa inhabited by smallholder farmers remain remote and highly unlikely.…”