[env-trinity] FW: Trinity River Flow Releases & Gravel Placement May 2010

Gutermuth, F. Brandt BGutermuth at usbr.gov
Wed Apr 21 13:37:04 PDT 2010


Dear Trinity River  enthusiasts -



For your information and safety on the river I provide the following information.  The Trinity River Restoration Program (TRRP) plans to initiate spring releases from the dam and high flow coarse sediment (gravel) implementation in the near future.



Flows will rise to 1,500 cubic feet per second (cfs) on April 27, and will peak at 6,000 cfs on May 2nd for 5 days. See attached flow schedule for timing details.



During peak flows, between Monday May 3rd and May 7th, the TRRP will add gravel (coarse sediment = gravel 3/4 to 4 inch diameter) to the river at two high flow locations.  1) At the weir hole (aka diversion pool at River Mile 111 about a mile downstream of Lewiston dam) up to 2,000 yards of gravel will added.  2) At the Lowden Ranch area (River Mile 105) just upstream of the mouth of Grass Valley Creek, up to 1,500 yards will be added.  In both of these areas high velocity conditions will move the gravel quickly downriver from the augmentation sites.



Best Regards-

Brandt



Brandt Gutermuth
Environmental Specialist
Trinity River Restoration Program
PO Box 1300, 1313 S Main St
Weaverville, CA  96093
530.623.1806 (voice)
530.623.5944 (fax)
www.trrp.net<www.trrp.net%20>




Water Year 2010 Release Schedule from Lewiston Dam to the Trinity River

as Recommended by the Trinity Management Council on March 31, 2010

For a Normal Water Year Type


Total Water Volume (acre-feet) =

646,561

>From Date

To Date

# Days

Flow Release (cfs)


Water Volume (Acre-Feet)

1-Oct-09

15-Oct-09

15

450

13,365

16-Oct-09

22-Apr-10

189

300

112,266

23-Apr-10

26-Apr-10

4

500

3,960

27-Apr-10

27-Apr-10

1

1,500

2,970

28-Apr-10

29-Apr-10

2

2,000

7,920

30-Apr-10

30-Apr-10

1

2,500

4,950

1-May-10

1-May-10

1

4,636

9,179

2-May-10

6-May-10

5

6,000

59,400

7-May-10

7-May-10

1

5,680

11,246

8-May-10

8-May-10

1

5,400

10,692

9-May-10

9-May-10

1

5,130

10,157

10-May-10

10-May-10

1

4,860

9,623

11-May-10

15-May-10

5

4,600

45,540

16-May-10

16-May-10

1

4,390

8,692

17-May-10

17-May-10

1

4,220

8,356

18-May-10

18-May-10

1

4,080

8,078

19-May-10

19-May-10

1

3,980

7,880

20-May-10

20-May-10

1

3,870

7,663

21-May-10

21-May-10

1

3,760

7,445

22-May-10

22-May-10

1

3,650

7,227

23-May-10

23-May-10

1

3,540

7,009

24-May-10

24-May-10

1

3,430

6,791

25-May-10

25-May-10

1

3,310

6,554

26-May-10

26-May-10

1

3,210

6,356

27-May-10

27-May-10

1

3,100

6,138

28-May-10

28-May-10

1

2,990

5,920

29-May-10

29-May-10

1

2,880

5,702

30-May-10

30-May-10

1

2,760

5,465

31-May-10

31-May-10

1

2,650

5,247

1-Jun-10

1-Jun-10

1

2,550

5,049

2-Jun-10

2-Jun-10

1

2,440

4,831

3-Jun-10

3-Jun-10

1

2,330

4,613

4-Jun-10

4-Jun-10

1

2,220

4,396

5-Jun-10

5-Jun-10

1

2,110

4,178

6-Jun-10

1-Jul-10

26

2,000

102,960

2-Jul-10

2-Jul-10

1

1,860

3,683

3-Jul-10

3-Jul-10

1

1,730

3,425

4-Jul-10

4-Jul-10

1

1,600

3,168

5-Jul-10

5-Jul-10

1

1,480

2,930

6-Jul-10

6-Jul-10

1

1,370

2,713

7-Jul-10

7-Jul-10

1

1,160

2,297

8-Jul-10

8-Jul-10

1

1,060

2,099

9-Jul-10

9-Jul-10

1

963

1,907

10-Jul-10

10-Jul-10

1

885

1,752

11-Jul-10

11-Jul-10

1

812

1,608

12-Jul-10

27-Jul-10

16

750

23,760

28-Jul-10

28-Jul-10

1

700

1,386

29-Jul-10

29-Jul-10

1

650

1,287

30-Jul-10

30-Jul-10

1

600

1,188

31-Jul-10

31-Jul-10

1

550

1,089

1-Aug-10

1-Aug-10

1

500

990

2-Aug-10

30-Sep-10

60

450

53,460







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