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Freeport NIP(7.6)-SY 991123
. November 23, 1999 PK No: 2052-99.198 Mr. Michael A. Martin CITY OF COPPELL 255 Parkway Boulevard Coppell, Texas 75019 Re: 140 ACRE TRACT Freeport Parkway @ Bethel Road Coppell, Texas Dear Mr. Martin: Transmitted herewith, via courier service delivery, please find enclosed the following prints for your approval: No. Date Description 1 11//99 Drainage Study 1 11//99 Detention Calculations If the enclosures are not as noted above, please contact this office immediately. If you have any questions regarding the enclosed items or need any additional information, please call me at your convenience· Sincerely, CJE/as 2052-04 enc. cc: Paul Brown - Duke-Weeks Corporation CITY OF DALLAS DETENTION BASIN DESIGN " GIVEN: RESULT: Area = 18.10 Maximum Required Prop C = 0.95 Storage = 202,862 cf Prop Tc = 10 min Max Q = 28.8 cfs 5 m~n. I= 10.6 Q= 0.95 10.6 18.10 182.3 cfs 10 m~n. I= 8.9 Q= 0.95 8.9 18.10 153.0 cfs 15 m~n. I= 7.6 Q= 0.95 7.6 18.10 130.7 cfs 20 m~n. I= 7.0 Q= 0.95 7.0 18.10 120.4 cfs 30 m~n. I= 5.8 Q= 0.95 5.8 18.10 99.7 cfs 40 m~n. I= 5.0 Q= 0.95 5.0 18.10 86.0 cfs 50 m~n. I= 4.4 Q= 0.95 4.4 18.10 75.7 cfs 60 m~n. I= 4.0 Q= 0.95 4.0 18.10 68.8 cfs 70 m~n. I= 3.7 Q= 0.95 3.7 18.10 63.6 cfs 80 m~n. I= 3.4 Q= 0.95 3.4 18.10 58.5 cfs 90 m~n. I= 3.1 Q= 0.95 3.1 18.10 53.3 cfs 5 min Storm In 5 182.3 60 = 54,680 cf Out 0.5 15 28.8 60 12,960 cf Storage 41,720 cf 10 min Storm In 10 153.0 60 = 91,821 cf Out 0.5 20 28.8 60 17,280 cf Storage 74,541 cf 15 minStorm In 15 130.7 60 = 117,614 cf Out 0.5 25 28.8 60 21,600 cf Storage 96,014 cf 20 min Storm In 20 120.4 60 = 144,438 cf Out 0.5 30 28.8 60 25,920 cf Storage 118,518 cf 30 min Storm In 30 99.7 60 = 179,516 cf Out 0.5 40 28.8 60 34,560 cf Storage 144,956 cf 40 min Storm In 40 86.0 60 = 206,340 cf Out 0.5 50 28.8 60 43,200 cf Storage 163,140 cf 50 min Storm In 50 75.7 60 = 226,974 cf ~Jut 0.5 60 28.8 Gu 51,840 cf Storage 175,134 cf 60 min Storm In 60 68.8 60 = 247,608 cf Out 0.5 70 28.8 60 60,480 cf Storage 187,128 cf 70 min Storm In 70 63.6 60 = 267,210 cf Out 0.5 80 28.8 60 69,120 cf Storage 198,090 cf 80 min Storm In 80 58.5 60 = 280,622 cf Out 0.5 90 28.8 60 77,760 cf Storage 202,862 cf 90 min Storm In 90 53.3 60 = 287,844 cf Out 0.5 100 28.8 60 86,400 cf Storage 201,444 cf CITY OF D~LLAS DETENTION BASIN DESIGN GIVEN: RESULT: Area = 43.90 Maximum Required Prop C = 0.95 Storage = 225,210 cf Prop Tc = 10 min Max Q = 183.5 cfs 5 m~n. I= 10.6 Q= 0.95 10.6 43.90 442.1 cfs 10 mm. I= 8.9 Q= 0.95 8.9 43.90 371.2 cfs 15 min. I= 7.6 Q= 0.95 7.6 43.90 317.0 cfs 20 m~n. I= 7.0 Q= 0.95 7.0 43.90 291.9 cfs 30 m~n. I= 5.8 Q= 0.95 5.8 43.90 241.9 cfs 40 m~n. I= 5.0 Q= 0.95 5.0 43.90 208.5 cfs 50 m~n. I= 4.4 Q= 0.95 4.4 43.90 183.5 cfs 60 min. I= 4.0 Q= 0.95 4.0 43.90 166.8 cfs 70 min. I= 3.7 Q= 0.95 3.7 43.90 154.3 cfs 80 min. I= 3.4 Q= 0.95 3.4 43.90 141.8 cfs 90 min. I= 3.1 Q= 0.95 3.1 43.90 129.3 cfs 5 min Storm In 5 442.1 60 = 132,622 cf Out 0.5 15 183.5 60 82,575 cf Storage 50,047 cf 10 min Storm In 10 371.2 60 = 222,705 cf Out 0.5 20 183.5 60 110,100 cf Storage 112,605 cf 15 min Storm In 15 317.0 60 = 285,262 cf Out 0.5 25 183.5 60 137,625 cf Storage 147,637 cf 20 min Storm In 20 291.9 60 = 350,322 cf Out 0.5 30 183.5 60 165,150 cf Storage 185,172 cf 30 rain Storm In 30 241.9 60 = 435,400 cf Out 0.5 40 183.5 60 220,200 cf Storage 215,200 cf 40 min Storm In 40 208.5 60 = 500,460 cf Out 0.5 50 183.5 60 275,250 cf Storage 225,210 cf 50 min Storm In 50 183.5 60 = 550,506 cf uut 0.5 60 183.5 bO 330,300 cf Storage 220,206 cf 60 min Storm In 60 166.8 60 = 600,552 cf Out 0.5 70 183.5 60 385,350 cf Storage 215,202 cf 70 min Storm In 70 154.3 60 = 648,096 cf Out 0.5 80 183.5 60 440,400 cf Storage 207,696 cf 80 min Storm In 80 141.8 60 = 680,626 cf Out 0.5 90 183.5 60 495,450 cf Storage 185,176 cf 90 min Storm In 90 129.3 60 = 698,142 cf Out 0.5 100 183.5 60 550,500 cf Storage 147,642 cf GIVEN: RESULT: Area = 16.30 Maximum Required Prop C = 0.95 Storage = 83,670 cf Prop Tc = 10 min Max Q = 68.1 cfs 5 m~n. I= 10.6 Q= 0.95 10.6 16.30 164.1 cfs 10 m~n. I= 8.9 Q= 0.95 8.9 16.30 137.8 cfs 15 m~n. I= 7.6 Q= 0.95 7.6 16.30 117.7 cfs 20 min. I= 7.0 Q= 0.95 7.0 16.30 108.4 cfs 30 min. I= 5.8 Q= 0.95 5.8 16.30 89.8 cfs 40 m~n. I= 5.0 Q= 0.95 5.0 16.30 77.4 cfs 50 m~n. I= 4.4 Q= 0.95 4.4 16.30 68.1 cfs 60 min. I= 4.0 Q= 0.95 4.0 16.30 61.9 cfs 70 m~n. I= 3.7 Q= 0.95 3.7 16.30 57.3 cfs 80 m~n. I= 3.4 Q= 0.95 3.4 16.30 52.6 cfs 90 m~n. I= 3.1 Q= 0.95 3.1 16.30 48.0 cfs 5 min Storm In 5 '~64.1 60 = 49,242 cf Out 0.5 15 68.1 60 30,645 cf Storage 18,597 cf 10 min Storm In 10 137.8 60 = 82,690 cf Out 0.5 20 68.1 60 40,860 cf Storage 41,830 cf 15 minStorm In 15 117.7 60 = 105,917 cf Out 0.5 25 68.1 60 51,075 cf Storage 54,842 cf 20 min Storm In 20 108.4 60 = 130,074 cf Out 0.5 30 68.1 60 61,290 cf Storage 68,784 cf 30 min Storm In 30 89.8 60 = 161,663 cf Out 0.5 40 68.1 60 81,720 cf Storage 79,943 cf 40 min Storm In 40 77.4 60 = 185,820 cf Out 0.5 50 68.1 60 102,150 cf Storage 83,670 cf 50 min Storm In 50 68.1 60 = 204,402 cf ,Jut 0.5 60 68.1 122,580 cf Storage 81,822 cf 60 min Storm In 60 61.9 60 = 222,984 cf Out 0.5 70 68.1 60 143,010 cf Storage 79,974 cf 70 min Storm In 70 57.3 60 = 240,637 cf Out 0.5 80 68.1 60 163,440 cf Storage 77,197 cf 80 min Storm In 80 52.6 60 = 252,715 cf Out 0.5 90 68.1 60 183,870 cf Storage 68,845 cf 90 min Storm In 90 48.0 60 = 259,219 cf Out 0.5 100 68.1 60 204,300 cf Storage 54,919 cf CITY OF DALLAS DETENTION BASIN DESIGN GIVEN: RESULT: Area = 5.10 Maximum Required Prop C = 0.95 Storage = 26,190 cf Prop Tc = 10 min Max Q = 21.3 cfs 5 m~n. I= 10.6 Q= 0.95 10.6 5.10 51.4 cfs 10 m~n. I= 8.9 Q= 0.95 8.9 5.10 43.1 cfs 15 m~n. I= 7.6 Q= 0.95 7.6 5.10 36.8 cfs 20 m~n. I= 7.0 Q= 0.95 7.0 5.10 33.9 cfs 30 m~n. I= 5.8 Q= 0.95 5.8 5.10 28.1 cfs 40 m~n. I= 5.0 Q= 0.95 5.0 5.10 24.2 cfs 50 m~n. I= 4.4 Q= 0.95 4.4 5.10 21.3 cfs 60 mm. I= 4.0 Q= 0.95 4.0 5.10 19.4 cfs 70 m~n. I= 3.7 Q= 0.95 3.7 5.10 17.9 cfs 80 m~n. I= 3.4 Q= 0.95 3.4 5.10 16.5 cfs 90 m~n. I= 3.1 Q= 0.95 3.1 5.10 15.0 cfs 5 min Storm In 5 51.4 60 = 15,407 cf Out 0.5 15 21.3 60 9,585 cf Storage 5,822 cf 10 min Storm In 10 43.1 60 = 25,872 cf Out 0.5 20 21.3 60 12,780 cf Storage 13,092 cf 15 min Storm In 15 36.8 60 = 33,140 cf Out 0.5 25 21.3 60 15,975 cf Storage 17,165 cf 20 min Storm In 20 33.9 60 = 40,698 cf Out 0.5 30 21.3 60 19,170 cf Storage 21,528 cf 30 min Storm In 30 28.1 60 = 50,582 cf Out 0.5 40 21.3 60 25,560 cf Storage 25,022 cf 40 min Storm In 40 24.2 60 = 58,140 cf Out 0.5 50 21.3 60 31,950 cf Storage 26,190 cf 50 min Storm In 50 21.3 60 = 63,954 cf (Jut 0.5 60 21.3 b~O 38,340 cf Storage 25,614 cf 60 min Storm In 60 19.4 60 = 69,768 cf Out 0.5 70 21.3 60 44,730 cf Storage 25,038 cf 70 minStorm In 70 17.9 60 = 75,291 cf Out 0.5 80 21.3 60 51,120 cf Storage 24,171 cf 80 min Storm In 80 16.5 60 = 79,070 cf Out 0.5 90 21.3 60 57,510 cf Storage 21,560 cf 90 minStorm In 90 15.0 60 = 81,105 cf Out 0.5 100 21.3 60 63,900 cf Storage 17,205 cf CITY OF DALLAS DETENTION BASIN DESIGN GIVEN: RESULT: Area = 15.50 Maximum Required Prop C = 0.95 Storage = 79,500 cf Prop Tc = 10 min Max Q = 64.8 cfs 5 m~n. I= 10.6 Q= 0.95 10.6 15.50 156.1 cfs 10 m~n. I= 8.9 Q= 0.95 8.9 15.50 131.1 cfs 15 m~n. I= 7.6 Q= 0.95 7.6 15.50 111.9 cfs 20 min. I= 7.0 Q= 0.95 7.0 15.50 103.1 cfs 30 m~n. I= 5.8 Q= 0.95 5.8 15.50 85.4 cfs 40 min. I= 5.0 Q= 0.95 5.0 15.50 73.6 cfs 50 m~n. I= 4.4 Q= 0.95 4.4 15.50 64.8 cfs 60 m~n. I= 4.0 Q= 0.95 4.0 15.50 58.9 cfs 70 m~n. I= 3.7 Q= 0.95 3.7 15.50 54.5 cfs 80 min. I= 3.4 Q= 0.95 3.4 15.50 50.1 cfs 90 m~n. I= 3.1 Q= 0.95 3.1 15.50 45.6 cfs 5 min Storm In 5 156.1 60 = 46,826 cf Out 0.5 15 64.8 60 29,160 cf Storage 17,666 cf 10 rainStorm In 10 131.1 60 = 78,632 cf Out 0.5 20 64.8 60 38,880 cf Storage 39,752 cf 15 minStorm In 15 111.9 60 = 100,719 cf Out 0.5 25 64.8 60 48,600 cf Storage 52,119 cf 20 min Storm In 20 103.1 60 = 123,690 cf Out 0.5 30 64.8 60 58,320 cf Storage 65,370 cf 30 min Storm In 30 85.4 60 = 153,729 cf Out 0.5 40 64.8 60 , 77,760 cf Storage 75,969 cf 40 min Storm In 40 73.6 60 = 176,700 cf Out 0.5 50 64.8 60 97,200 cf Storage 79,500 cf 50 rainStorm In 50 64.8 60 = 194,370 cf ,.)ut 0.5 60 64.8 dO 116,640 cf Storage 77,730 cf 60 min Storm In 60 58.9 60 = 212,040 cf Out 0.5 70 64.8 60 136,080 cf Storage 75,960 cf 70 min Storm In 70 54.5 60 = 228,827 cf Out 0.5 80 64.8 60 155,520 cf Storage 73,307 cf 80 min Storm In 80 50.1 60 = 240,312 cf Out 0.5 90 64.8 60 174,960 cf Storage 65,352 cf 90 min Storm In 90 45.6 60 = 246,497 cf Out 0.5 100 64.8 60 194,400 cf Storage 52,097 cf CITY OF D~LLAS DETENTION BASIN DESIGN GIVEN: RESULT: Area = 7.40 Maximum Required Prop C = 0.95 Storage = 38,010 cf Prop Tc = 10 min Max Q = 30.9 cfs 5 m~n. I= 10.6 Q= 0.95 10.6 7.40 74.5 cfs 10 m~n. I= 8.9 Q= 0.95 8.9 7.40 62.6 cfs 15 mm. I= 7.6 Q= 0.95 7.6 7.40 53.4 cfs 20 m~n. I= 7.0 Q= 0.95 7.0 7.40 49.2 cfs 30 m~n. I= 5.8 Q= 0.95 5.8 7.40 40.8 cfs 40 m~n. I= 5.0 Q= 0.95 5.0 7.40 35.2 cfs 50 min. I= 4.4 Q= 0.95 4.4 7.40 30.9 cfs 60 min. I= 4.0 Q= 0.95 4.0 7.40 28.1 cfs 70 m~n. I= 3.7 Q= 0.95 3.7 7.40 26.0 cfs 80 min. I= 3.4 Q= 0.95 3.4 7.40 23.9 cfs 90 m~n. I= 3.1 Q= 0.95 3.1 7.40 21.8 cfs 5 min Storm In 5 74.5 60 = 22,355 cf Out 0.5 15 30.9 60 13,905 cf Storage 8,450 cf 10 min Storm In 10 62.6 60 = 37,540 cf Out 0.5 20 30.9 60 18,540 cf Storage 19,000 cf 15 min Storm In 15 53.4 60 = 48,085 cf Out 0.5 25 30.9 60 23,175 cf Storage 24,910 cf 20 min Storm In 20 49.2 60 = 59,052 cf Out 0.5 30 30.9 60 27,810 cf Storage 31,242 cf 30 min Storm In 30 40.8 60 = 73,393 cf Out 0.5 40 30.9 60 37,080 cf Storage 36,313 cf 40 rain Storm In 40 35.2 60 = 84,360 cf Out 0.5 50 30.9 60 46,350 cf Storage 38,010 cf 50 min Storm In 50 30.9 60 = 92,796 cf ~Jut 0.5 60 30.9 bO 55,620 cf Storage 37,176 cf 60 minStorm In 60 28.1 60 = 101,232 cf Out 0.5 70 30.9 60 64,890 cf Storage 36,342 cf 70 min Storm In 70 26.0 60 = 109,246 cf Out 0.5 80 30.9 60 74,160 cf Storage 35,086 cf 80 min Storm In 80 23.9 60 = 114,730 cf Out 0.5 90 30.9 60 83,430 cf Storage 31,300 cf 90 minStorm In 90 21.8 60 = 117,682 cf Out 0.5 100 30.9 60 92,700 cf Storage 24,982 cf CITY OF ~LLAS DETENTION BASIN DESIGN GIVEN: RESULT: Area = 225.40 Maximum Required Prop C = 0.50 Storage = 897,576 cf Prop Tc = 43 rain Max Q = 255.2 cfs 5 mm. I= 10.6 Q= 0.50 10.6 225.40 1194.6 cfs 10 m~n. I= 8.9 Q= 0.50 8.9 225.40 1003.0 cfs 15 mm. I= 7.6 Q= 0.50 7.6 225.40 856.5 cfs 20 mm. I= 7.0 Q= 0.50 7.0 225.40 788.9 cfs 30 m~n. I= 5.8 Q= 0.50 5.8 225.40 653.7 cfs 40 m~n. I= 5.0 Q= 0.50 5.0 225.40 563.5 cfs 50 m~n. I= 4.4 Q= 0.50 4.4 225.40 495.9 cfs 60 m~n. I= 4.0 Q= 0.50 4.0 225.40 450.8 cfs 70 mm. I= 3.7 Q= 0.50 3.7 225.40 417.0 cfs 80 mm. I= 3.4 Q= 0.50 3.4 225.40 383.2 cfs 90 mIn. I= 3.1 Q= 0.50 3.1 225.40 349.4 cfs 5 min Storm In 5 1194.6 60 = 358,386 cf Out 0.5 48 255.2 60 367,488 cf Storage (9,102) cf 10 rain Storm In 10 1003.0 60 = 601,818 cf Out 0.5 53 255.2 60 405,768 cf Storage 196,050 cf 15 min Storm In 15 856.5 60 = 770,868 cf Out 0.5 58 255.2 60 444,048 cf Storage 326,820 cf 20 min Storm In 20 788.9 60 = 946,680 cf Out 0.5 63 255.2 60 482,328 cf Storage 464,352 cf 30 minStorm In 30 653.7 60 = 1,176,588 cf Out 0.5 73 255.2 60 558,888 cf Storage 617,700 cf 40 min Storm In 40 563.5 60 = 1,352,400 cf Out 0.5 83 255.2 60 635,448 cf Storage 716,952 cf 50 min Storm In 50 495.9 60 = 1,487,640 cf Out 0.5 93 255.2 60 712,008 cf Storage 775,632 cf 60 min Storm In 60 450.8 60 = 1,622,880 cf Out 0.5 103 255.2 60 788,568 cf Storage 834,312 cf 70 min Storm In 70 417.0 60 = 1,751,358 cf Out 0.5 113 255.2 60 865,128 cf Storage 886,230 cf 80 min Storm In 80 383.2 60 = 1,839,264 cf Out 0.5 123 255.2 60 941,688 cf Storage 897,576 cf 90 min Storm In 90 349.4 60 = 1,886,598 cf Out 0.5 133 255.2 60 1,018,248 cf Storage 868,350 cf