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HomeMy WebLinkAbout3.01 Post Development Drainage200 DEVELOPED RUNOFF RATES Basin Area (Ac) Q(25) (GIs) Q(100) (cfs) Basin A 9.54 5 9 Basin B 10.06 5 9 Basin C 6.33 4 7 Basin D 20.55 13 23 Basin E 11.92 6 12 Basin F 28.45 3 . 11 Basin G 5.20 2 5 Basin H 17.21 9 18 Basin J 9.68 8 6 14 10 Basin K 7.69 Basin L 15.34 10 18 Basin M 395 202 373 Basin N 56.80 57 93 Basin 0 74.90 59 99 Basin P 14.65 17 27 Basin 0 68.9 42 81 Basin R 15.90 2 7 Basin S 25.25 21 37 Basin T 30.72 3 9 Basin U 67.44 31 62 Basin V 160.12 21 56 Combined 1051.85 524 974. Combined Peak w/ Detention 150 299 0 too GRAPHIC SCALE 200 400 DRAINAGE CONCEPT NOTES: 1. CULVERTS ARE SIZED TO CONVEY RUNOFF FROM 25 -YEAR DESIGN STORM. 2. AUGMENTATION POND IN NORTHEAST CORNER OF SITE WILL PROVIDE 11.78 ACRE-FEET OF STORAGE FOR STORMWATER DETENTION ABOVE A PERMANENT WATER SURFACE ELEVATION OF 7123 FEET. OVERFLOW STRUCTURE AT 7123 FEET WILL RELEASE STORMWATER TO 36" OUTLETS. OUTFLOW WILL THEN DRAIN TO STORAGE IN BASIN V. 800 ( IN FEET ) 1 inch = 200 ft. • 117 • • • • • • • sifs • • • • • • • • • 477 • • r• J r. • I f I • / I • \ I / / / / I / 1 1 I I • • • • • • • • • • • • • • • 6,5:33 acres I • • • • • • • 1 • • • / • • 1 1 • / \I _ // / // I / / / // '/• / // / / / � 1r / I/ 1 // 1/ f/ f/ // / / / 1 / 1 / I / / r I I f 1 1 I / / / 1 I I / / 1 I 1 t \ \ 11\ `\� Q 11 FARI'• ''L\\A \. \\ \. 1 \ `-.86•.45 acres \ `\ • \ \ \ 1 \ \` ` • 5 \ 1 \ • • \\ \\ I I1 - I 5 \ \ _ \ 5 1 I \ \ - 1 - 1 -.5 \ \ • _ • • O M DRAINAGE CONCEPT NOTES CONTINUED: 3. BERM WILL BE CONSTRUCTED IN BASIN V TO CREATE DETENTION AREA FOR STORMWATER DURING LARGE STORM EVENTS. A WEIR WITH CREST ELEVATION 7079.0 FEET WILL ALLOW RELEASE OF FLOWS TO DITCH SECTION. A 12" DRAIN PIPE WILL DRAIN ANY STANDING WATER. THE 2-36" CULVERTS WILL PASS 100 -YEAR DESIGN FLOWS BENEATH ROAD. 4. CULVERT OUTLET SECTIONS WILL BE ARMORED TO PREVENT EROSION OF DITCHES AND SWALES. 1% \= 1� I 1 ; / / \ \ 1 I / \�-_ \\ \ •� t 1 \ \ \• • WT 3O 2.3) acresl' j I I/ I I/ /: \ ' • N � 1 \% / / / / I I 1 / // / /' / / • \ DRAINAGE CONCEPT NOTES CONTINUED: 5. ROCK, CHECK STRUCTURES WILL BE CONSTRUCTED IN ROADWAY DITCH SECTIONS AND SWALES WHERE VELOCITIES EXCEED 5.0 FEET PER SECOND AND/OR SLOPES EXCEED 3.0%. 6. ALL FINISHED FLOOR ELEVATIONS OF PROPOSED STRUCTURES SHOULD BE ELEVATED A MINIMUM OF 2.0 FEET ABOVE HIGHEST ADJACENT GRADE DUE, TO PROBABILITY OF SHALLOW SHEET FLOW FLOODING FROM NATURAL DRAINAGES AND STEEP TOPOGRAPHY. DRAINAGE CONCEPT NOTES CONTINUED: LEGEND 7. EXISTING IRRIGATION DITCHES/CANALS WILL BE INCORPORATED INTO THE LAYOUT OF THE SITE. FOR DESIGN CALCULATION PURPOSES, ALL IRRIGATION DITCHES WERE ASSUMED TO BE AT FULL CAPACITY AND UNABLE TO ACCEPT ANY STORMVVATER. • a • \ • •N . 1 \\ • \ \ • \ • • 'r LOT 39 /772.24\acres � ?180 �N / i \ -\.\ CULVERTS . ( / r / / /' - / - / / ,BASIN/0// r \ \/ I r// / / / • / / / • r • / / / /' // I / / ./ / / ( • 1 1 1I 1 k t • • • • • • • • • • • • • • / • • • - • • • / / / 1 1 1 1 1 \\ • i \ LOT 32 400 acres \ • • \ LOT 33 2.00 acres \ \ 0 • .4 1 •\ \\ \• \ \ • • \ • \ 1 ( I t 1 • \ \ • • • \\I • ' • / \ - 7280 ---- % •i • \ e• \ • - •`\ \ \ - • • + + + / r DRAINAGE SUB -BASIN BOUNDARY CENTERLINE DITCH DIRECTION OF SURFACE RUNOFF DETENTION/POND AREA N \ \ N \ \ � _• ----- ----- • ;; r ---- _ 1 ���i• . `• I \ ) 1 t I I •\`• N. •\ %♦ ' .• � i t t r• • - \` • • d -- . • \ \• \ • • `•-------- f / 7---` N •_ ---- // / . __ _ / , 1 • ,/ t t /1 t ---- - - --- - -- • • • • •. PAS?? L,A.1 \. \ \ \ ---•--------------8 45 Petr. ( • • .•"N. \ \ • \ • : N \ • 1 t• 11 \ 11 --- �`-_ -N - -5 �\ N•` `•\ \`• \ •\` •\ \ 1\\\ -` - ` � • `•`\\•\\•\�•\`•\\\`\•` \- � I I '• 1 e.� _ ` - - �`• • • ••� •�` \\ ••` ••\ .\ \`1 . • N N • 1 • • 4 / - . . . . . _ 2. . . . ., . : . . . . s:7•1 :::::::::: ,,,,,,, ...:ii .:,,, . ,.,. . . ":,.. :::- . .. . ...:: ,:: :::: :: : : - .. .::::: :Ii. • I 11 11 1 I - \\ �' --i l��fl liatilJ ��1 � �i-�. �\ �\ \\ \c I, I I II / /- I 1 / // I I / l I 1 / 1 ( / I / I •• \ • • • • ( 1 • \ 1 1 1 1. // I \1 `/ 1 zOP0SE 2-x18" CULVERTS • 1 • \ \ \ 0 / • • 1 • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • PROpOSED 18" • • • • • • • • • • • • • • • • • • • • .7 • • • • • • • • • • \ \ • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • LOT 34\\, ZOO acres • r `/ rr '' LOT' 1'9 01 acres' f I r I • • • • • • 3.2/ acres ,UA IN -13- • 2.03 acres ) PROPOSED 24" CULVERT / • ..„ ""\_.... _ f 40r_71. -N vow •2sOlwacresi / , r 7 / r / '/ ,r// / , /;i / r1 ,/ r, -r / ,r /, //////,//r�// / / / // / /,/////////, / ///,/!/,'!/ / // //• r//'7 I II1 /// //'/J/,//,//'r1'/ r i,rrr 7 I JJ/7 /i' J//// . 11/(/il / /, titt1t / f/// // J/ // / � /\\ , •_ \ \�_, / 7_,,,,ti.i....i.„-r1 - -0 1 I I \ \ • II I‘II N'::::)11 /11 ill 1/1 k • \.., __ _ .._ • , • • • • • • • LOT 71-- 2,01--ifires- -7270 • • • AT 1.0X ;rim 1.1 SIDE SWES • • • • ilAStiN B, • 0 ZO1 acres ‘‘ • • • • • • • • • 11151114\11\ ,2.O2 acra / • • • • • 11 • • • • • • • • • • • • • • • • • • • • • • PRO 2-,24" CULVE 1)0 • • • • • • • • • • • • • • • • I • • 1 • • • • • • • • • • • • • • • • • • It • • • • • • • • • • • • • • • I • • • • • • • • • • • LOT 90 2.54 acres • • • • • • • • • • / 7 /J./ 1 ti -A S 11_N7 -.... 1 I : . . . . 11- ::::: -,-; 11;./. , ., : : • „.; . 0/ • • LOT 89 BASIN A • • • • • • • • • 0 cc Z 14 111 CI- 0 -J 111 0 ix CO 0 Cl C.44 CO c% 970241.6027 fax 970256.7992 • • • • • • 18" CULVERT /I • • • • • REVIEWED BY JEK DESIGNED BY JD DATE 3/28/07 SCALE 1" = 200' PROJECT NO 27003.02 SHEET NO