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Figure 7. Airtight flow - through chamber at San Marcos National Fish Hatchery & Technology Center and selected City of San <br />Marcos wellheads. <br />Outflow hose: very end <br />of the hose is elevated in <br />T' order to prevent <br />siphoning of water out <br />m <br />' of chamber when the <br />pump is not on. <br />Valve _ x <br />preventing - <br />backflow <br />Water movement Inflow hose that connects to a faucet at <br />Water can be <br />the well head (temporarily disconnected <br />diverted to w? <br />in photo); this receives water pumped <br />- directly from the well. <br />reach pressure <br />At <br />r <br />gauge and then <br />connect to •< _. <br />.�. <br />outflow hose. <br />:lam: e <br />Collection hose: where <br />Where Gore sampling module is water samples are <br />located -- secured with fishing line obtained —Small gray <br />(which is attached to the end closest to valve before the hose can <br />Section added by US Fish & be opened or closed (left <br />Wildlife to collect invertebrates sample collection hose) and is closed when no sample is <br />suspended in the chamber as flowing being collected). <br />that may be pumped form the water moves over it. <br />well. The red valve can shut off <br />flow to this chamber & water can <br />still exit via pressure gauge hose. <br />-18- <br />