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<br />I
<br /> III-4
<br />I TABLE III-3
<br /> HYDROLOGICAL SUMMARY TABLE
<br />I DESIGN PEAK FLOWS FOR LfYDEN, RALSTON AND VAN BIBBER CREEKS
<br /> PRESENT AND FUTURE DEVELOPMENT CONDITIONS
<br />I Area(l)
<br /> Precipit. Present Basin Development Conditions Future Basin Development Conditions Future Basin Development Conditions
<br /> Sq. Mi. Without Leyden Lake With Leyden Lake in Place
<br /> Location 2-Year ' 5-Year 10-Year 100-Year 2-Year 5-Year 10-Year 100-Year 2-Year 5-Year 10-Year 100-Year
<br />I Leyden Creek
<br /> Above Leyden Lake 0 1,300 3,300 600 1,100 2,000 3,800 600 1,100 2,000 3,800
<br />I Below Leyden Lake 0 700 1,900 600 1,110 2,000 3,800 410 750 1,220 2,200
<br />Mouth of Leyden Cr.(2) 900 2,400 800 1,500 2,500 4,300 520 980 1,530 2,600
<br />I Ralston Creek
<br />I Above Leyden Creek (1) 2,800 4,700 1,100 1,900 3,200 4,800 1,100 1,900 3,200 4,800
<br />Below Leyden Creek (1) 3,000 6,000 1,800 3,000 4,000 7,900 1,400 2,300 3,000 6,200
<br /> Above Van Bibber Creek (1) 3,000 6,100 2,300 3,800 5,000 9,700 1,900 3,100 4,000 8,000
<br />I Below Van Bibber Creek (1) 3,100 8,700 2,700 4,400 6,100 10,600 2,300 3,700 5,100 8,900
<br /> Mouth of Ralston Creek (1) 3,800 9,300 3,000 4,900 6,300 11,500 2,600 4,200 5,300 9,800
<br />I Van Bibber Creek
<br />I At Hogback 0 130 330 730 1,800 130 330 730 1,800 130 330 730 1,800
<br />Upstream south tributary 130 330 730 1,800 130 330 730 1,800 130 330 730 1,800
<br />I Ramsetter 0 30 80 160 340 30 80 160 340 30 80 160 340
<br />South tributary 0 100 240 470 1,000 100 240 470 1,000 100 240 470 1,000
<br /> Downstream south
<br />I tri butary 17 220 430 800 2,400 220 430 800 2,400 220 430 800 2,400
<br /> Upstream of north
<br />I tributary 17 240 470 870 2,610 210 430 810 2,450 210 430 810 2,450
<br />Hyatt 0 20 50 70 210 100 180 240 480 100 180 240 480
<br />I North tributary 0 40 90 140 380 240 400 530 1,000 240 400 530 1,000
<br />Downstream of north
<br />I tributary 17 260 530 980 2,930 240 570 900 2,600 240 570 900 2,600
<br />Mouth of Van Bibber 17 270 570 1,000 3,000 380 760 1,100 2,700 380 760 1,100 2,700
<br />I (1) For Ralston Creek the area reductions to precipitation are: Present basin conditions = 91 square miles; Future basin conditions = 30 square miles
<br />I (2) Peak runoff at the mouth of Leyden Creek is based on the average of the 30 square mile reduction and no reduction.
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