* 5 



Water Level Data at 6-min Intervals 

 (10/17/96 through 10/18/96) 



-Yarborough Pass (004) 

 -Rincon del San Jose (003) 

 -EIToro(007) 



2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 



Time, hr 



Figure 23. Plot of simultaneous water-level records at three neighboring 

 nontidal stations along the GIWW 



Establishment of Stations 



Because of the variability in water-level change within short distances 

 along the shallow inland waters of Texas, numerous temporary gauges will 

 be needed for establishing requirements for long-term stations. The next 

 step in designing a network should be a detailed field reconnaissance to 

 determine suitable locations for short-term stations. Such a 

 reconnaissance may take on the order of a month and involve CES WG 

 Area Office personnel, as well as coordination with personnel overseeing 

 dredging operations and regulatory functions. 



Short-term stations should be operated for a minimum of 30 days to 

 provide data for zoning the area. The requirement for the number and 

 location of long-term stations for navigation and regulatory support can 

 then be made. 



To meet its specific needs during particular dredging operations, the 

 CESWG has in the past made water-level measurements and will continue 

 to do so. It is desirable that these project-level gauges be referenced to 

 benchmarks, and they must be referenced to the applicable NOS chart 



Chapter 5 Consideration of an Expanded Network 



43 



