SS & Turbidity Sampling May 24

Current Opened Gates: Automatic for 3.5 ft water depth

Suspended sediment and turbidity samples at 5 different locations were taken by Sheila (URS), Kelly (UNM), and Jungseok (UNM).

Water depth was set 3.5 ft with automatic gate operation and 3.45 ft water depth was shown in the PLC screen at 9:00 am. River discharge has been changed from

3,300 cfs to 3,100 cfs along the sampling day as shown in the hydrograph. Figure 1 shows gate configuration at 9:00 am and water depth on the top of the gate #1 was

5 inches. With help of Larry (WUA staff), gates #5-9 were fully raised and gates #10-24 were lowered to keep the 3.5 ft water depth. After 20 minutes, water depth

on the top of the gate was increased up to 13 inches. Three SS and turbidity samples were taken at the intake structure. These samples will compare with the samples

taken at 3:00 pm to figure out gate manipulation effect on SS and turbidity.

At 3:00 pm, water depth on the gate #1 was measured 12 inches. Three SS samples were taken at 5 locations (see sampling location map). Average values from the

three samples will be used for SS analysis. One additional sample was taken for turbidity.

A total 20 bottles of sample (15 bottles for SS, 5 bottles for turbidity) was taken.

 
 
 Figure 1  Figure 2. East Alameda Br.  Sampling Locations (click for large image)
 
  
 Figure 3. West Alameda Br.