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HomeMy WebLinkAboutPlan, Tentative APPLICANT 3/29/2022In c� O L In SA V] fTl O D fTl fTl W N In S r�i G t 7 ti 0 m Ly7 � rn O m1 m m m < Ul=< < D y DD >mmz y y 2U) �4m➢o L�7 a in v o -G' O N�0 0 zavNi 'm` �'� -iN o `l7 Z ymZZ v mzm V] II m TI z .b y? m In X00 D 1 z z o x ? CAC C] p CD z z DCD � 0 F A Z X O A A m O O SJ fTl { O m m (O N my D D > p ➢ cD y r m O m � fTl X X � N m N VI m In Vl In V1 N T ti ro C O A z D � A O ➢ A ➢ Z � C O SO y !Aq Z � O O < ➢ Z m C ➢ D r O O m A r 0 S O r 0 Oz Z T Z A y Z ➢ Z O D O z b y y z C A y To j z i S z v' o zo O o T D � r m n _ � T A o z z 0 0 O r C m � r O m m O � D O C O A Z T A Cri7 z c7 uivI M=,,> I m-13* !"din PLANS PREPARED BY: THE FAVREAU GROUP CIVIL ENGINEERING 3750 NORWICH AVE. EUGENE, OR 97408 (541) 683-7048 DATE BY DESCRIPTION REVISIONS APPROVED: DESIGNED DRAWN APP. CHECKED DATE 03 -25 - DATE TAX MAP LOTS 17-03-26-24-3300 SITE ASSESSMENT 5TH ST. 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I m m I — _ _ _ — _ _ _ _ _ — _ ------ -- —_—_— rA LINE M=m(n ,> !^9DL mi?n m PLANS PREPARED BY: APPROVED: N �y�,v c�sfF THE FAVREAU GROUP UTILITY PLAN m ° ' ° 0 o CIVIL ENGINEERING o g� 5TH ST. APARTMENTS ` ' �' 3750 NORWICH AVE. DATE 9�� EUGENE, OR 97408 (541)683-7048 DESIGNED DRAWN DATE BY DESCRIPTION APP. TAX MAP LOTS CITY OF SPRINGFIELD W CHECKED DATE PUBLIC WORKS DEPARTMENT REVISIONS 03-25-22� EEE 7-03-26-24-3300 5" STREET APARTMENTS DRAINAGE STUDY March 25, 2022 SITE CHARACTERISTICS The subject properly is identified on County Assessor's Maps as 17-03-26-24-3300. It is located on the west side of 5" Street, south of S St. The site is an open field and consists of about 0.53 acres. EXISTING HYDROLOGY The site is relatively flat and portions of the site drain to the north. The 10 -year pre -development runoff is 0.17 c.f.s. PROPOSED HYDROLOGY The post development runoff will be limited to the pre -development runoff of 0.17 c.f.s. via an infiltration/detention pond. An infiltration test was performed on March 25, 2022 and an infiltration rale of 4" per hour was observed. The calculations are based on 2" per hour, giving a factor of safely equal to 2. Attached are the calculations. CONCLUSION Based on my calculations and the proposed drainage system is sized properly and will provide the necessary flow control. ti�NY�.FP� EXPIRES DEC- 31. 2023 10 YEAR STORM RATIONAL METHOD FOR 5th STREET APARTMENTS PRE -DEVELOPMENT SHEET 1 OF 1 CALCULATED BY: AJF CHECKED BY: March 25, 2022 NODE AREA(ACRES DEV. I T.T. T.C. I I C Q(25) FLOW I SLOPE V HYDRAULICS NO. SUBAREA TOTAL TYPE MIN. MIN. IN/HR. TOTAL LENGTH FT./FT. FT./SEC AND NOTES FT./FT. 30 1 INITIAL AREA PRE -1 0.5 0.5 OPEN 30 1.10 0.30 PRE -1 0.5 0.5 S.F. 0 0.17 0.00500 2.1 8" PVC, 27% Full 0 0.39 0.00500 2.7 8" PVC, 43% Full 10 YEAR STORM RATIONAL METHOD FOR 5TH STREET APARTMENTS POST -DEVELOPMENT SHEET 1 OF 1 CALCULATED BY: AJF CHECKED BY: March 25, 2022 NODE AREA ACRES DEV. I T.T. T.C. I I C 1 Q(25) FLOW I SLOPE V HYDRAULICS NO. SUBAREA TOTAL TYPE MIN. MIN. IN/HR. TOTAL LENGTH FT./FT. FT./SEC AND NOTES 20 1 INITIAL AREA PRE -1 0.5 0.5 S.F. 20 1.40 0.55 0 0.39 0.00500 2.7 8" PVC, 43% Full DETENTION POND CALCULATIONS FOR 5th St. Apartments DRAINAGE AREA= 23,122 SQ.FT.= 0.531 ACRES AVERAGE RUNOFF COEFFICIENT (C)= 0.75 BOTTOM LENGTH OF POND = 65 FEET BOTTOM WIDTH OF POND= 10 FEET DEPTH OF POND= 3 FEET SIDE SLOPES = 0 FEET HORIZONTAL TO 1 FOOT VERTICAL VOID RATIO = 100 . AVERAGE PERMEABILITY OF SOIL= 2.001NCHES/HR SURFACE AREA OF BOTTOM = 650 SQ. FT. OUTFLOW CAPACITY OF POND= 108.3 CU. FT./HR= 1351 GALLONS PER MINUTE MAXIMUM STORAGE AT OVERFLOW= 1,950.00 CU. FT. OF WATER PONDVOLUME= 0.0 CUBIC YARDS 10 YEAR TOTAL RECURRENCE RAINFALL TOTAL OUTFLOW DURATION DURATION RAINFALL DURING STORM EVENT FROM STORAGE POND STORAGE OUTFLOW OFSTORM OFSTORM INTENSITY STORM RUNOFF POND REQUIRED STORMWATER DEFICIT TOSD IN MINUTES IN HOURS IN/HR INCHES CU. FT. CU. FT. CU. FT. CONTAINED CU.FT. C.F.S. 5 0.08 3.10 0.26 373 9 364 OK NONE 0 10 0.17 2.10 0.35 506 18 468 OK NONE 0 15 025 1.65 0.41 596 27 569 OK NONE 0 20 0.33 1.40 0.47 674 36 638 OK NONE 0 30 050 1.10 0.55 795 54 741 OK NONE 0 60 1.00 0.70 0.70 1,012 106 903 OK NONE 0 120 2.00 0.50 1.00 1,445 217 1,228 OK NONE 0 180 3.00 0.44 1.32 1,908 325 1,583 OK NONE 0 240 4.00 0.41 1.64 2,370 433 1,937 OK NONE 0 360 6.00 0.36 2.16 3,121 650 2,471 TOOSMALL 521 0.07 480 8.00 0.32 2.56 3,700 867 2,833 TOOSMALL 883 0.12 600 10.00 0.28 2.80 4,046 1,063 2,963 TOOSMALL 1,013 0.14 720 12.00 0.25 3.00 4,335 1,300 3,035 TOOSMALL 1,085 0.15 900 15.00 0.21 3.15 4,552 1,625 2,927 TOOSMALL 9T 0.09 1080 18.00 0.20 3.60 5,202 1,950 3,252 TOOSMALL 1,302 0.12 1260 21.00 0.19 3.99 5,766 2,275 3,491 TOOSMALL 1,541 0.14 1440 24.00 0.18 4.32 6,243 2,600 3,643 TOOSMALL 1,693 0.16 vIV c'EU V, ION J 'Pee y0n0 �. F PS EXPIRES DEC. 31, 2023 POND STAGE STORAGE 8 STAGE DISCHARGE TABLE Length= 65.0 Width= 10.0 Side Slope= - Depth Area Volume Outfo. 0.10 650.00 65 108.33 0.20 650.00 130 108.33 0.30 650.00 195 108.33 0.40 650.00 260 108.33 0.50 650.00 325 108.33 0.75 650.00 488 108.33 1.00 650.00 650 108.33 1.25 650.00 813 108.33 1.50 650.00 975 108.33 1.75 650.00 1,138 108.33 2.00 650.00 1,300 108.33 2.25 650.00 1,463 108.33 2.50 650.00 1,625 108.33 2.75 650.00 1,788 108.33 3.00 650.00 1,950 108.33 3.25 650.00 2,113 108.33 3.50 650.00 2,275 108.33 3.75 650.00 2,438 108.33 4.00 650.00 2,600 108.33 4.25 650.00 2,763 108.33 4.50 650.00 2,925 108.33 4.75 650.00 3,088 108.33 5.00 650.00 3,250 108.33 5.25 650.00 3,413 108.33 5.50 650.00 3,575 108.33 5.75 650.00 3,738 108.33 6.00 650.00 3,900 108.33 6.25 650.00 4,063 108.33 6.50 650.00 4,225 108.33 6.75 650.00 4,388 108.33 7.00 650.00 4,550 108.33