Krasnodar GRES Project Volume I11 Environmental Assessment
Krasnodar GRES Project Volume I11 Environmental Assessment Krasnodar GRES Project Volume I11 Environmental Assessment
4.2.1.7 Regime of Surface Runoff The characteristic of surface runoff in the Laba river at the Krasnodar GRES site was drawn from reference materials published in the cadastral literature (Surface water resources, hydrological yearbooks, etc.) The data from the Kaladzhinskaya gauging station was accepted as characteristic of the annual runoff in the Krasnodar GRES region, since the difference in the areas of the cross sections under consideration is insignificant. Tables 4.25, 4.26, 4.27, and 4.28 summarize the parameters of the Laba river runoff. Table 4.26 Annual Distribution of Runoff in the Laba River Near Kaladzhinskaya in Years Differing in Water Content (m31s) I 1 11 1111 IIV IV MONTHS ~VI lvll lvlll IIX Average IX 1x1 1 XII l~ear 17.3117.9128.9 186.7 1170 1214 1171 1107 175.7 144.8 136.9 126.9 183.1 Dry, with probability 75 % 15.7~15.7~23.4)71.3~150 1189 1150 194 167 138.3132.2123.5172.5 Dry, with probability 95 % 11.2 111.9 117.3 152.7 1129 1166 1129 181.6 151.3 130.3 124.6 117.3 160.2 Table 4.27 Average Long-Term and Computed Values of Seasonal Runoff in the Laba River Near Kaladzhinskaya Seasons Wet, summer (V-VIII) Limiting fall- winter (IX-ll) Spring (Ill-IV) Limiting period (IX-IV) Average for Long-Term Period Dis- Volume charge ,mln. m3/s m3 157 1672 39.3 63.8 45.5 614 336 950 Coefficients Cv 0.22 0.30 0.30 0.25 Cs 0.44 1.50 0.60 0.50 Computed Values, m3/s 25% 75% 95% 97% 1901 706 397 1099 1409 485 263 781 1120 387 190 600 1055 368 174 560 PAGE 4-29
Dimensionality 8 % mln. m3 8 O h mln. m3 8 % mln. m3 2 Yo mln. m3 Summer (V-VIII) V 16.7 448 17.0 446 17.2 394 17.9 340 VI 21.2 619 21.5 564 21.7 497 22.9 434 VII Vlll 16.8 491 17.1 448 17.3 396 17.9 340 10.6 309 10.7 281 10.8 247 11.3 215 Table 4.28 Annual Runoff in the Laba River Near Kaladzhinskaya IX 7.7 225 7.6 199 7.7 176 7.1 135 Monthly Runoff Fall-Winter (IX-Ill X 4.5 131 4.5 118 4.4 101 4.2 80 XI 3.7 108 3.7 97.0 3.7 84.7 3.4 65 XI1 Wet 0=25% 2.7 78.9 Average(norma1) 2.7 70.8 1.8 47.1 1.8 47.1 Dry 0=75% 2.7 61.8 Dry 0=95% 2.4 46 I 1.8 52.7 1.8 41.3 1.55 29.5 l I 1.8 52.7 1.8 41.3 1.65 31.5 Spring Ill 3.1 90.7 2.9 76.0 2.7 61.9 2.4 46.0 IV 9.4 275 8.7 228 8.2 187 7.3 139 Year 100 2921 100 2622 100 2289 100 1901 Summer V-VIII 65.3 1907 66.3 1739 67.0 1534 70 1329 Seasonal Runoff Fall Spring Ill-IV IX-ll 22.2 648 22.1 579 22.1 506 20.3 387 12.5 366 11.6 304 10.9 249 9.7 185 34.7 1014 33.7 883 33.0 755 30 572 Lim Per IX-IV e PAGE 4-30 1
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4.2.1.7 Regime of Surface Runoff<br />
The characteristic of surface runoff in the Laba river at the <strong>Krasnodar</strong> <strong>GRES</strong> site<br />
was drawn from reference materials published in the cadastral literature (Surface<br />
water resources, hydrological yearbooks, etc.)<br />
The data from the Kaladzhinskaya gauging station was accepted as characteristic<br />
of the annual runoff in the <strong>Krasnodar</strong> <strong>GRES</strong> region, since the difference in the<br />
areas of the cross sections under consideration is insignificant.<br />
Tables 4.25, 4.26, 4.27, and 4.28 summarize the parameters of the Laba river<br />
runoff.<br />
Table 4.26<br />
Annual Distribution of Runoff in the Laba River Near Kaladzhinskaya in<br />
Years Differing in Water Content (m31s)<br />
I 1 11 1111 IIV IV<br />
MONTHS<br />
~VI lvll lvlll IIX<br />
Average<br />
IX 1x1 1 XII l~ear<br />
17.3117.9128.9 186.7 1170 1214 1171 1107 175.7 144.8 136.9 126.9 183.1<br />
Dry, with probability 75 %<br />
15.7~15.7~23.4)71.3~150 1189 1150 194 167 138.3132.2123.5172.5<br />
Dry, with probability 95 %<br />
11.2 111.9 117.3 152.7 1129 1166 1129 181.6 151.3 130.3 124.6 117.3 160.2<br />
Table 4.27<br />
Average Long-Term and Computed Values of Seasonal Runoff in the Laba River<br />
Near Kaladzhinskaya<br />
Seasons<br />
Wet, summer<br />
(V-VIII)<br />
Limiting fall-<br />
winter (IX-ll)<br />
Spring<br />
(Ill-IV)<br />
Limiting period<br />
(IX-IV)<br />
Average for<br />
Long-Term Period<br />
Dis- <strong>Volume</strong><br />
charge ,mln.<br />
m3/s m3<br />
157 1672<br />
39.3<br />
63.8<br />
45.5<br />
614<br />
336<br />
950<br />
Coefficients<br />
Cv<br />
0.22<br />
0.30<br />
0.30<br />
0.25<br />
Cs<br />
0.44<br />
1.50<br />
0.60<br />
0.50<br />
Computed Values, m3/s<br />
25% 75% 95% 97%<br />
1901<br />
706<br />
397<br />
1099<br />
1409<br />
485<br />
263<br />
781<br />
1120<br />
387<br />
190<br />
600<br />
1055<br />
368<br />
174<br />
560<br />
PAGE 4-29
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