1 / 23

CORRECTION/COMPLETION OF RAINFALL DATA

CORRECTION/COMPLETION OF RAINFALL DATA. PRIMARY & SECONDARY VALIDATION FLAGGING : SUSPECT OR INCORRECT VALUES MISSING : NON-OBSERVANCE OR LOSS OF DATA ESTIMATE - SAME/NEIGHBOURING STATIONS WHERE POSSIBLE INCORRECT DATA TO BE CORRECTED MISSING DATA TO BE COMPLETED (FILLED-IN)

teagan-poole
Download Presentation

CORRECTION/COMPLETION OF RAINFALL DATA

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. CORRECTION/COMPLETION OF RAINFALL DATA • PRIMARY & SECONDARY VALIDATION • FLAGGING : SUSPECT OR INCORRECT VALUES • MISSING : NON-OBSERVANCE OR LOSS OF DATA • ESTIMATE - SAME/NEIGHBOURING STATIONS • WHERE POSSIBLE • INCORRECT DATA TO BE CORRECTED • MISSING DATA TO BE COMPLETED (FILLED-IN) • IF NOT POSSIBLE • SUSPECT DATA WILL BE RETAINED AS FLAGGED • INCORRECT DATA TO BE SET AS MISSING • MISSING VALUES LEFT AS SUCH OHS - 1

  2. CORRECTION/COMPLETION OF RAINFALL DATA • PROCEDURE TO BE EMPLOYED • TYPE OF ERROR • AVAILABILITY OF SUPPORTING DATA FOR ESTIMATION • DONE AT SDPCs/RDPCs • DATA VALIDATION REPORT FROM DDPCs OHS - 2

  3. CORRECTION/COMPLETION PROCEDURES • ARG/SRG DATA AT ONE OR MORE STATIONS • CORRECTING TIME SHIFT IN DATA • APPORTIONING ACCUMULATIONS • ADJUSTING DATA FOR LONG TERM SHIFT • DOUBLE MASS ANALYSIS • SPATIAL INTERPOLATION • ARITHMETIC AVERAGE • NORMAL RATIO • NEAREST NEIGHBOUR OHS - 3

  4. SRG SUSPECT/FAULTY - ARG AVAILABLE OHS - 4

  5. ARG MISSING/FAULTY - SRG AVAILABLE • ARG RECORD NOT AVAILABLE • FAULT IN EQUIPMENT / RECORDING MECHANISM • CHART/DATA MISSING • SRG RECORD AT STATION AVAILABLE • HOURLY DISTRIBUTION • SIMILAR TO NEIGHBOURING STATIO(S) OHS - 5

  6. OHS - 6

  7. OHS - 7

  8. CORRECTING TIME SHIFT OHS - 8

  9. APPORTIONING ACCUMULATED RAINFALL • DATA VALIDATION • ACCUMULATION INDICATED • AMOUNT OF ACCUMULATION • PERIOD OF ACCUMULATION • CORRECTION • ESTIMATE BY SPATIAL INTERPOLATION • APPORTIONING REPORTED ACCUMULATION PROPORTIONATELY OHS - 9

  10. ESTIMATE - SPATIAL INTERPOLATION • APPORTIONING ACCUMULATED TOTAL OHS - 10

  11. ACCUMULATION INDENTIFIED OHS - 11

  12. APPORTIONING ACCUMULATION OHS - 12

  13. ADJUSTING LONG TERM SHIFTS - DOUBLE MASS ANALYSIS ADJUSTED SLOPE 2 SLOPE 1 OHS - 13

  14. DATA CORRECTION OHS - 14

  15. RESULTS - DOUBLE MASS ANALYSIS OHS - 15

  16. DATA ADJUSTED OHS - 16

  17. SPATIAL INTERPOLATION • ARITHMETIC AVERAGE • ANNUAL AVERAGE WITHIN 10% • NORMAL RATIO METHOD OHS - 17

  18. I + II Test station + + + + Neighbouring stations + Selected neighbouring stations + + + + II etc. + Quadrant + + + + + IV III + NEAREST NEIGHBOURHOOD METHOD (DISTANCE POWER) OHS - 18

  19. OHS - 19

  20. COMPUTATION OF STATION WEIGHTS OHS - 20

  21. OHS - 21

  22. COMPARISON OF OBSERVED & ESTIMETED OHS - 22

  23. CORRECTION FOR HETEROGENEITY • STATION NORMALS • HISTORICAL RECORDS • RELATIONSHIP WITH ELEVATION OHS - 23

More Related