The watershed program offers technical assistance to watershed groups, municipalities, and individual citizens. A watershed is a geographic area of land across which water, and the sediments and dissolved materials it contains, flow on their way to a single common outlet -- a stream, lake or river.
A lumbar peritoneal (LP) shunt is a technique of cerebrospinal fluid (CSF) diversion from the lumbar thecal sac to the peritoneal cavity.
Below is a list of valves that are used in lumbarâperitoneal shunts (LP shunts) and Cerebral shunts (for a more detailed list of the types of valves see type of valves): 1  Delta. 2  Medium Pressure Cylindrical. 3  Nulsen and Spitz.  Anti- 1 Siphon. Sigma.