Eocene flysch forms the southwest boundary of the catchment area, towards which the catchment basin drains and where the Ombla rises.
Conventional hydrologic analyses of digital elevation models (DEMs) perform well in areas of high topographic relief, where surface water flow is typically unidirectional, convergent, spatially static, and directed toward a single discharge point at the edge of a catchment.
Parents thus found themselves on the edge of the local system of school choice: outside the catchment areas for a couple of hugely oversubscribed schools within a few miles and therefore faced with bus journeys to other places that, in some cases, took around an hour each way.
The Late Wisconsinan ice sheet extended to the edge of the continental shelf, and was divided into catchments, with fast flow concentrated in deep channels.
In the Coromandel area, Reid et al. (2010) found the greatest changes to aquatic invertebrate communities following harvest occurred at a threshold catchment size of <500 ha and an upstream harvest area of >40% of the catchment, particularly when clear-cut harvesting to the stream edge.
Depending on the suburb, the residential supply may be derived from groundwater from aquifers underlying the city, surface water from catchments along the eastern edge of the city, or a mixture of both.
It is true that lotteries in the two "dual" catchments are likely to promote within-catchment balanced intakes for the pair of schools in each case, but this cannot touch the far more severe inequalities that have been created by the drawing of the catchment map itself.
In August, snowmelt runoff from non-glacierized regions of the catchment is small, while bare ice melt is most important.
