Delta Volume Calculation

Subir Saha

Bay-Delta Office

Department of Water Resources

Station Map of 20 mm Delta-Smelt Survey

Voronoi Diagram

If these dots represent the locations of survey stations, the Voronoi diagram partitions space into cells around each station.

Voronoi diagrams represent the region of influence around each of a given set of sites.

919

918

915

914 912

910

906

902

901

815812

809

804 802801

716

711

707

706

703

610

609606

602

519513

508504

501418

405

346

343

342

340

336335334

705704

520411

345344

341

329328323

Voronoi Diagram Used For Setting Up Boundary To Calculate Volume

Developed by John Donovan

328

334 335

329

323

340

336

342343

405

341

Station Boundary for Volume Calculation in San Francisco Bay

418411

504

501

602

508513

520

704

606

610

519

609

802-1

703801

706-1

804

Station Boundary for Volume Calculation in Suisan Marsh

705

707

815-1

716

706-2809-1

919

812-1

711

Station Boundary for Volume Calculation in Northern Delta

802-2

809-2812-2 901

915-1

912-1

910

906

914-1

815-2

Station Boundary for Volume Calculation in Central Delta

915-2

912-2

918

914-2

Station Boundary for Volume Calculation in Southern Delta

12,130438520

41,9211,703513

53,3442,296508

67,9424,101519

3,156259610

8,114727609

17,6851,332606

72,8527,361602

44,0462,403504

36,8563,692501

37,3442,119411

63,1862,756418

139,8043,547405

9,792552340

9,213617341

6,243713342

7,0551,156343

87,5912,604336

49,4753,945323

43,5083,060329

17,7472,316335

37,1776,746334

125,5948,323328

Volume (acre-feet)

Surface Area (acre)

Survey Station

14,6851,601918

13,3021,146915

23,5521,554914

13,7471,225912

25,7601,925910

32,6941,780906

22,0951,744902

33,8553,822901

20,7022,043919

720534023815

43,8101,767812

33,5621,392809

103,5926,219716

39,3911,994711

37,0761,859707

3,741277705

24,539931706

15,952605704

45,0943,546802

32,1191,195804

25,8532,091703

45,6622,226801

Volume (acre-feet)

Surface Area (acre)

Survey Station

Calculated Surface Area and Volume of 20 mm Delta-Smelt Survey Stations

Thank You