REPORT ON DEMARCATION OF PRIORITY MICRO WATERSHEDS IN 4CIB (LOWERPONNAIYAR UPTO SATHANUR DAM) AND 4CIC (UPPER PONNAIYAR BEYONDSATHANUR DAM) SUBCATCHMENTS (RVP), CHITTOR DISTRICT ANDHRA PRADESH,BANGALORE (RURAL & URBAN) AND KOLAR DISTRICTS, KARNATAKA,CUDDALORE, DHARAMPURI, SALEM, THIRUV ANNAMALAI, VELLORE ANDVILLUPURAM DISTRICTS TAMILNADU AND PONDICHERRY

ABSTRACT.

1. Survey area :Report On Demarcation Of Priority Micro Watersheds In 4CIB(Lower Ponnaiyar Upto Sathanur Dam) And 4CIC (Upper PonnaiyarBeyond Sathnur Dam) Subcatchments (RVP), Chittor District AndhraPradesh, Bangalore (Rural & Urban) And Kolar Districts, Karnataka,Cuddalore, Dharmapuri, Salem, Thiruvannamalai, Vel1ore, andVilIupuram Districts TamiInadu, and PondichelTY.

2. Location 11° 37'50" to 13° 30'45" N Latitude and77° 32'10" to 79° 49'5" Longitude

3. Total area surveyed 15, 17,508 hectares

4. Agro climatic region 10 (semiarid subtropical with excessive evapo-transpiration)

5. Type of survey RR survey for priority delineation

6. Period of survey 1993-1998

7. Base maps 1:50,000 scale survey of India topographic maps

8. Topo-sheet nos. 58 II 1,5,9,1358M! 1,2, 5, 6, 9, 10, 13, 1457 H/9, 10, 13,1457L/ 1, 2,3,4,5,6,7,8,10,11,12,14,15,1657!P3,4,8,57 G110, 11, 12, 14, 15,16,57KJ 4

9. Hydrological divisionsa) Regionb) Basinc) Catchmentd) Sub catchmentse) Watershedsf) Subwatershedsg) Microwatersheds

-4-4C-4C1- 4C1B& 4CIC- 4C1B1to 4CIB5, and 4C1C1 to 4C1C9-230- 1585

-11-

]o. SUB WATERSHEDS AND MICROW ATERSm~DS

11. Priority categorization

12. Soil Erosion hazard

13. Distribution of the area vis a vis land use types

SLNo Water- Number of No of micro Area in SI. No Water- Number of No of Area insheds Sub water-sheds Hectare sheds Sub mIcro Hectare

watersheds watersheds watershedsI 4ClB] 21 ]46 138642 6 4C]CI ]8 ]22 ]004082 4CIB2 10 71 59191 7 4CIC2 16 116 1007873 4CIB3 19 106 102016 8 4CIC3 IS III 1075894 4CII34 7 36 33471 9 4CIC4 15 82 721995 4C lB5 20 121 92610 10 4CIC5 22 175 181494

Total 77 -t80 425750 II 4CIC6 17 103 9378312 4CIC7 20 137 14044513 4CIC8 20 139 16465514 4CIC9 ]8 120 130398

Total 161 1105 1091758Grand Total 230 1585 1517508

SI. Priority. Silt yield index No. of Micro- Area in ha. PercentageNo. category watershedsI Very high 1200 and above 66 53578 3.52 High II 00-II99 108 100788 6.63 Medium 1000-1099 338 326211 21.54 Low 900-999 455 446888 29.55 Very low Less than 900 618 590043 38.9

Total 1585 1517508 100.0

SI. Erosion Area in ha. PercentageNo.2 Slight Erosion 487622 32.13 Slight to moderate Erosion 89286 6.04 Moderate Erosion 779550 51.45 Moderate to severe Erosion 16697 1.16 Severe Erosion 3535 0.27 Severe to very severe Erosion 8228 0.5

Total 1384918 91.3Miscellaneous 132590 8.7

Total 1517508 100%

SI. Land use category Area PercentageNo. (ha.)I Area under rain fed cultivation 426349 28.092 Area under irrigated cult!ltin 416764 27.483 Plantation Crops 234910 15.484 Barren/Fallow 10901 0.725 Forest 115228 7.596 Sparse vegetation/bushy vegetation uncultivated 180504 11.897 Quarying 262 0.02

Total 1384918 91.26Misc. 132590 8.74Total 1517508 100.0

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14. Distribution of soils vis a vis soil texture and erosion categories

15. Distribution of soils ofthe area vis a vis soil depth

SI. Textural Slight Slight to Moderate Moderate Severe Severe Misc. Total %No. classes erosIOn moderate erosIon to severe erosIOn to very lands area In

erosIOn erosIOn severe ha.erosIOn

1 Coarse sand 612 151 1744 - - - - 2507 0.22 Gravelly fine - 9333 - - - - - 9333 0.63 Moderately 298953 711 2793 - - - - 302457 19.9

fine to fine4 Moderately 27038 48782 117299 15.435 466 - - 209020 13.8

fine gravell y i5 Fine loamy to - - 884 - - - - 884 0.06

fine6 Moderately - 370 400 - - - - 700 0.05

coarse gravelly7 Moderately - - 5244 1106 262 - - 6612 0.4

coarse8 Medimll - - 26339 - - - - 26339 1.7

texture ---------.9 Moderately 159967 11325 598376 156 2807 226 - 772857 50.9

fine10 Fine loamy - 617 - - - 4470 - 5087 0.3II Fine 1052 10631 329 - - 3352 - 15544 1.012 Moderately - - 5Q9 - - - - 5829 0.4

tine to coarse13 Moderately - 7366 280 - - - - 7646 0.5

coarse tomoderatelytine

14 Fine to coarse - - 15846 - - - - 15846 1.015 Moderately - - 4187 - - - - 4187 0.3

fine to loamySubtotal 1384848 91.3

16 Miscellaneous 132590 132590 8.7Total 487622 89286 779500 16697 3535 8228 132590 1517508 100

Sl. Depth Category Area (ha.) PercentageNo.

Very Shallow to Shallow Soils 67991 4.48I Shallow to moderately deep Soils 306649 20.212 Moderately deep to 4ep 49761 3.283 deep to very deep Soils 661196 43.574 Very deep Soils 299271 19.72

Total 1384918 91.265 Misc. 132590 8.74

Total 1517508 100.0

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16. Distribution of soils of the area vis a vis physiographic position

17. Distribution of Soils vis a vis different slope categories

18. Distribution of Area in different Priority Categories vis a vis Ditfeent States and its District

Sl. Physiographic Position Area PercentageNo. (ha.)I River /Streams 16406 1.082 Sand beaches 1365 0.083 Delta alluvium/marine alluvium 278 0.024 Valley plains 299719 19.755 Pediplains 795057 52.396 Pediments 57876 3.817 Subdued hills 2414.0 1.598 Hill Valley 3433 0.239 Hill side slopes 183112 12.0710 Gullied lands 3532 0.23

Total 1384918 91.2611 Misc. 132590 8.74

Total 1517508 100.0

Sl. Slope category Area (ha.) PercentageNo.

I Nearly level to Very Gently Sloping (0-3 'Yo) 450910 29.72 Very Gentlv Sloping to Gently Sloping (1-5 %) 543602 35.83 Gently Sloping to Strongly sloping (1-15 %) 66652 4.54 Gentlv Sloping to Strongly Sloping (3-10 'Yo) 123005 8.15 Moderately Sloping Strongly Sloping(5-15 %) 13761 0.96 Strongly Sloping to Moderately Steep to Steep (10-25 %) 28031 1.87 Steep to Very Steep (25-50 %) 158957 10.5

Total 1384918 91.3Misc. 132590 8.7Total 1517508 100

Districs Very High Medium Low Very Total %

SI.No. State High LowAndra

1 pradesh Chittoor 120 1093 7053 2013 454 10733 0.7

2 Karnataka Bangalore 1851 2245 13089 79650 104792 201627 13.3

3 Karnataka Kolar 14 4638 29006 56294 74345 164297 10.8

4 Tamil nadu Dharmapuri 17129 43775 178463 213744 117488 570599 37.6

5 Tamil nadu North Areat 26326 32280 76884 59719 72102 267311 17.6

6 Tamil nadu Pondicherry 0 0 0 0 7868 7868 0.5

7 Tamil nadu Salem 65 4539 3378 8553 2925 19460 1.3

8 Tamil nadu South Areot 8073 12218 18338 26915 210069 275613 18.2

Total 53578 100788 326211 446888 590043 1517508 100.0

-v -19. Distribution of Area in different Priority Categories vis a vis Watersheds

20. Distribution .ofArea in ditTerent States and its Districts vis a vis Watersheds

Very Very51.No. Watersheds High HiQh Medium Low Low Total %

1 4C1B1 - 9795 14557 114110 138462 9.12 4C1B2 - - - - 59191 59191 3.93 4C1B3 - - 5023 8593 88400 102016 6.74 4C1B4 - - - 836 32635 33471 2.2---5 4C1B5 11582 3104 5766 19399 52759 92610 6.16 4C1C1 8463 19479 24662 16376 . 31428 100408 6.67 4C1C2 - 463 13693 36609 50022 100787 6.68 4C1C3 - - 5527 63168 38894 107589 7.19 4C1C4 1569 3406 9777 36519 20928 72199 4.8

10 4C1C5 - 1278 9252 49958 121006 181494 1211 4C1C6 - - 1841 11498 80444 93783 6.212 4C1C7 - 2383 10325 35100 92637 140445 9.313 4C1C8 - - 1622 15489 147544 164655 10.914 4C1C9 - 1851 3505 18109 106933 130398 8.6

Grand Total 21614 31964 100788 326211 1036931 1517508 100

AP Pondie Karnataka Tamilnaduherry

ci 'c (ijZ L.. Q) :] 0Q) a a.en a .s= 0 0 m I-0 (ij E EL..(/J a '5 0 uQ)-c 0> Iii IiiroQ) :t:: c: c: Q)E a m a .s= (ij

-£j 0 a.. (J) en z 0 (/)

4C181 - - - - 138462 - - - 138462 9.11 (146) (146)

4C182 - 7868 - - 51323 - - - 59191 42 (24) (70) (71)

4C183 - - - - 24884 77132 - - 102016 6.73 (40) (89) (106)

4C184 - - - - 33471 - - - 33471 2.24 (36) (36)

4C185 - - - - 23423 69187 - - 92610 6.15 . (38t (100) (121)

4C18 - 7868 - - 271563 146319 - - 425750 286 (24) (330) (189) (480)

4C1C1 - - - - 4050 34971 59972 - 100408 6.67 (11) (48) (87) (122)

4C1C2 - - - - - - 82742 1415 100787 6.68 (106) (3) (116)

4C1C3 2478 - - - - 17405 87706 18045 107589 7.19 (5) (34) (102) (25) (111)

4C1C4 1603 - - - - 68616 1980 - 72199 4.8

(3)(80) (6) (82)

104C1C5 34 - - - - - 181460 - 181494 12

11 (1) (175) (175)4C1C6 - - - 180 - - 93603 - 93783 6.2

12 (2) (103) (103)4C1C7 6618 - - 95097 - - 38730 - 140445 9.3

13 (15) (94) (58) (137)4C1C8 - - 124422 15827 - - 24406 - 164655 11

14 (117) (23) (34) (139)4C1C9 - - 77205 53193 - - - . - 130398 8.6

15 (83) (57) (120)4C1C 10733 - 201627 164297 4050 120992 570599 19460 1091758 72

16 (24) (200) (176) (11) (162) (671) (28) (1105)Total 10733 7868 201627 164297 275613 267311 570599 19460 1517508 100

(24) (24) (200) (176) (341) (351) (671) (28) (1585)

- VI-21. Extent of area under different erosion intensity mapping units:

Sl. No. EIMUs Area in ha. Percent1. A4 16406 1.082. CAI 287 0.023. CA3 1052 0.074. CA4 278 0.025. CAS 612 0.046. CA6 315 0.027. CD3 151 0.018. GI 35278 2.329. Gl.1 1209 0.0810. 01.2 145 0.01II. 02 40079 2.6412. 02.1 18530 1.2213. G2.2 20241 1.3314. 02.3 5271 0.3515. 02.4 1986 0.1316. 02.5 1298 0.0917. 02.6 . 21735 1.4318. 02.7 2545 0.1719. 02.8 806 0.0520. G2.9 241 0.0221. 03 2881 0.1922. 04 5244 0.3523. G5 4065 0.2724. 05.1 558 0.0425. G5.2 262 0.0226. 05.3 2494 0.1627. G5.4 8792 0.5828. 05.5 4390 0.2929. 65.6 112 0.0130. G6 894 0.0631. 07.1 868 0.0632. 08 280 0.0233. G8.1 5425 0.3634. G8.2 548 0.0435. GR.3 1563 0.1036. G8A 760 0.0537. 09 896 0.063R. G9.1 15846 1.0439. 09.3 2156 0.1440. GIO 40854 2.6941. GIO.1 62123 4.0942. GIOA 11210 0.7443. 010.5 1025 0.0744. 010.6 8805 0.5845. GIO.7 19730 1.3046. 010.9 29089 1.9247. 012 207091 . 13.6548. 012.1 35656 2.3549. 012.2 1313 0.0950. 012.3 466 0.0351. 012.4 7366 0.4952. G12.5 117103 7.7253. 012.6 747 0.0554. 012.9 452 0.0355. G12.1O 8881 0.5956. G13 1681 0.11

57. 014 32234 2.1258. 014.1 722 0.0559. 014.2 12841 0.8560. 014.3 864 0.0661. GIS 1836 0.1262. 016 370 0.0263. 016.1 400 0.0364. 017 401 0.0365. GI8 7094 0.4766. 018.1 884 0.0667. 019 25202 1.6668. 022 9053 0.6069. 022.1 911 0.0670. 023.1 3356 0.2271. 024 1578 0.1072. 026 296350 19.5373. 026.1 85962 5.6674. 026.2 3284 0.2275. 026.3 4845 0.3276. 026.5 2317 0.1577. 027 2232 0.1578. 028.2 617 0.0479. 029.4 1944 1.T380. 029.5 1617 161781. 030 552 0.0482. 030.1 176 0.0183. 031 2551 0.1784. 03 1.2 154 0.0185. 032 1242 0.0886. 033 1565 0.1087. 033.1 225 0.0188. 033.2 156 0.0189. 037 51694 3AI90. 037.1 4187 0.2891. 039.1 4470 0.2992. 040 226 0.0193. Lt* 329 0.0294. L7* 201 0.0195. LTl 1144 0.0896. LT2 23534 1.5597. LT2.1 5163 0.3498. LT3 1661 0.1199. LT4 408 0.03100 LT5 382 0.23101 LT6 3532 0.23102 LT7 711 0.5103 LT8 3650 0.24

Total 13849] 8 91.26Miscellaneous

Marshy lands. 122 0.0]ROC 5325 0.35Habitation 51525 3.40River/stream 17175 1.13Tmk 58443 3.85M1SC TOTAL 132590 8.74

Total 1517508 100.0