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39 Table J11: Runoff equations forthe ACRU runoff regions of NatallKwaZulu (continued). ACRU HRU HRU tertiary catchment Runoff equation Correlation Number runoff hydro coefficient in region logical sample zone 11 10 VOl B/02/03B/04/05/06/07B MAR = 10,27 x 10 0,00121 MAP 0,941 8 12 6b UllI13B/21/22/23B/30/40 MAR = 7,22 x 10 0,00132 MAP 0,997 7 13 3a VOlA MAR = 37,79 x 10 0,00083 MAP 0,996 5 14 3b U12N03A/07A MAR = 52,57 x 10 0,00072 MAP 0,999 5 15 2b U23A MAR = 20,81 x 10 0,00096 MAP 0,963 26 16 6a U13A MAR = 17,07 x 10 0,00105 MAP 0,950 14 17 2a T51/52 MAR = 12,31 x 10 0,00128 MAP 0,993 17 18 la T41/53/54/55 MAR = 6,56 x 10 0,00156 MAP 0,968 33 19 3d T35 MAR = 4,33 x 100,00164 MAP 0,972 9 20 3c T31 MAR = 3,00 x 10 0,00169 MAP 0,995 9 21 lb T42 MAR = 3,96 x 10 0,00168 MAP 0,997 8 Source: After Schulze, R.E., 1984. An assessment of the surface water resources of Natal, Natal Town and Regional Planning Commission Report, VOl 63, Pietermaritzburg, 44 p. and map. Note: Correlation coefficients are very high (all r> 0,941 with 10>0,990). Accordingly, estimates ofthe MAR which are based on the calibrated Pitman Model simulations generated by the Hydrological Research Unit (briefly discussed a little later in the chapter), can be assumed to be realistic. (ii) HRU tertiary catchment W34 does not exist. (iii) HRU tertiary catchment T32 was not included in the study by Schul2e (1984 - above). (iv) MAP refers to mean annual precipitation. 10.4.1 KwaZulu catchments The firm Eksteen Van der Wait and Nissen (1990) in an analysis of catchments in KwaZulu, divided the territory into 12 catchments on a priority basis (Table J12). Each catchment was given a three-digit number. The first digit indicates position from south to north - where 1 represents catchments in the south of Kwazulu; 2 represents the
IlfllllllllllJJilll 40 Table J12: KwaZulu catchments as determined by Eksteen Van der Wait and Nissen IEVNI. 1990. EVN catchment code number River catchment 110 uMvoti 120 uThongati/uMdloti 130 uMngeni 140 iLovu/uMlazi 150 uMkhomazi 160 uMzimkhulu 210 uThukela/Amatigulu 310 uMfolozi 320 uMhlathuze 410 uPhongolo 420 uMkhuze 430 iHluhluwe/iNyalazi Source: After Anonymous. 1990. KwaZulu catchments development potential study 1990, VOL 1 - 3, various pages, and Appendix of maps, various pages. Eksteen Van der Wait and Nissen, Pietermaritzburg. IThe report contains valuable data on a catchment-by-catchment basis, inter alia on soil types and soil erosion. surface runoff, veld types, water quality, sediment yield and groundwater sources in KwaZulul. Tugela River catchment only; 3 represents the Mfolozi and Mhlatuze River catchments, while 4 denotes catchments in the north of KwaZulu. The second digit indicates defined river catchments. with the third digit consisting of a dummy number. 10.5 Homogeneous climate zones in NatallKwaZulu . Dent. Lynch and Tarboton 119901* reported on the delineation of 712 homogeneous climate zones in South Africa (see the chapter on rainfall), based on mean annual precipitation; altitude; aspect; geographic proximity; roughness of terrain, and the variety of agricultural activities. The homogeneous zones in Natal/KwaZulu are listed in Table * See Dent, M.C., Lynch, 5.0. and Tarboton, H., 1990. Detailed delimitation of rainfall regions in southern Africa, Water SA. VOL 16111, p. 1 - 4.
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40<br />
Table J12: KwaZulu catchments as determined by Eksteen Van der Wait and Nissen<br />
IEVNI. 1990.<br />
EVN catchment code number River catchment<br />
110 uMvoti<br />
120 uThongati/uMdloti<br />
130 uMngeni<br />
140 iLovu/uMlazi<br />
150 uMkhomazi<br />
160 uMzimkhulu<br />
210 uThukela/Amatigulu<br />
310 uMfolozi<br />
320 uMhlathuze<br />
410 uPhongolo<br />
420 uMkhuze<br />
430 iHluhluwe/iNyalazi<br />
Source: After Anonymous. 1990. KwaZulu catchments development potential<br />
study 1990, VOL 1 - 3, various pages, and Appendix <strong>of</strong> maps, various<br />
pages. Eksteen Van der Wait and Nissen, Pietermaritzburg. IThe report<br />
contains valuable data on a catchment-by-catchment basis, inter alia on soil<br />
types and soil erosion. surface run<strong>of</strong>f, veld types, water quality, sediment<br />
yield and groundwater sources in KwaZulul.<br />
Tugela River catchment only; 3 represents the Mfolozi and Mhlatuze River catchments,<br />
while 4 denotes catchments in the north <strong>of</strong> KwaZulu. The second digit indicates defined<br />
river catchments. with the third digit consisting <strong>of</strong> a dummy number.<br />
10.5 Homogeneous climate zones in NatallKwaZulu .<br />
Dent. Lynch and Tarboton 119901* reported on the delineation <strong>of</strong> 712 homogeneous<br />
climate zones in South Africa (see the chapter on rainfall), based on mean annual<br />
precipitation; altitude; aspect; geographic proximity; roughness <strong>of</strong> terrain, and the variety<br />
<strong>of</strong> agricultural activities. The homogeneous zones in Natal/KwaZulu are listed in Table<br />
*<br />
See Dent, M.C., Lynch, 5.0. and Tarboton, H., 1990. Detailed delimitation <strong>of</strong> rainfall regions in<br />
southern Africa, Water SA. VOL 16111, p. 1 - 4.
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