Area subject to Land use change or Management/Practice change (ha):
Design capacity description:
The temporary structures utilizing locally available timber have been designed to reduce the hill slopes thus attenuate the surface runoff as well as the sentiment volume. This measure enables the increase of soil moisture, water absorption, and infiltration. Additionally, it creates suitable sites for natural regeneration or technical afforestation of the burned area.
The maximum volume of runoff water that can be retained has not been assessed as this was not originally a water retention application but the restoration of the surrounding of the archeological site.
The factors that influence the selection and design of the NWRM is morphology, vegetation, climate and geology of the area. The morphology of the area (large slopes), increases surface runoff, leading to soil erosion and increased risk of landslides as well as increased flood events. To address this, the use of geotextile had to be implemented in most sloping and vulnerable positions. The vegetation (after the fires) has eliminated and a hydrophobic layer in the soil has been created by the combustion of organic matterwhich increases surface runoff and flood risk. The local climate, with an annual precipitation of over 1.000 mm and often intense events, also tends to increase the intensity of flood events.
The soils of the study area are also very loose and corrodible; thus vulnerable to the rainfall.
A high challenge for the temporary small structures is the hydraulic undercut.
Improving the condition of existing rainwater drainage system e.g. cleaning of the rainwater drainage system to avoid filling the road network with logging waste and increasing the flood risk.
The necessary preconditions are the climate conditions and the soil properties and characteristics.