南水北调中线工程渠首区位于河南省南阳市。
The channel origin of the medium route project of water transfer from south to north locates the Nanyang City in Henan province.
中游渠首地基是粘粒极少、极松散的粉细沙层。
Middle reaches canal head foundation is the non-cohesive soil, extremely loose silt sand.
这些措施主要有：节约用水，在渠首建防沙设施，以减少引沙量；
The controlling measures are mainly to economize on water, build sediment prevention facilities at headworks for reducing the amount of sediment diversion;
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