Download Integrated Watershed Management: Connecting People to their by H Gregersen, P Ffolliott, K Brookes PDF

By H Gregersen, P Ffolliott, K Brookes

As human populations extend and calls for upon usual assets elevate, the necessity to deal with the environments during which humans dwell turns into extra vital but additionally tougher. Land and water administration is mainly serious because the use of upstream watersheds can significantly impact huge numbers of individuals residing in downstream watersheds. An built-in strategy that stresses either the significance of participatory making plans and the institutional and technical constraints and possibilities is hence worthwhile. The institutional and technical context for handling watersheds and river basins, together with the involvement of either the private and non-private sectors, can be tested.

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Example text

The magnitude of the increase in water flowing from a watershed following changes in vegetative cover also depends on the amount of annual precipitation, soil characteristics and the percentage of the watershed affected by the change in vegetative cover. Higher water yield responses are generally expected on watersheds with high annual precipitation and deep soils, while responses are lower with the opposite conditions. There is usually a lower limit of annual precipitation below which there would be little or no effect on water yield with changes in forest conditions.

Land use that causes excessive runoff and sediment flow can potentially increase the magnitude of medium and smaller floods but have minimal affect on large floods. Flood damages and loss of life result largely from people occupying flood plains and other flood-prone areas rather than human-induced flooding through land use and watershed management practices in upland areas. ● Groundwater implications Relationships between land use on a watershed and its impact on groundwater are less certain than the land use–surface water relationships discussed above.

Among these rehabilitation activities are: Cumulative Effects 35 ● Establishing protective vegetative covers on severely eroded or otherwise degraded hillslope sites is common. Grasses and mixtures of grasses, legumes and other herbaceous plants are often seeded from aircraft. Most mixes contain annual plants for a rapidly established cover and perennial plants to establish longer-term protection. Mulching might be spread over the soil surface to protect it from raindrop impact. Other hillslope treatments include tilling, temporary fencing, installation of erosion-control fabric, use of straw wattles and lopping and scattering of slash.

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