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MITIGATION DESIGN CERTIFICATION
Project: VETERANS PARK IMPROVEMENTS
Project No: 12118C
Date: February 27, 2013
I Trey Schneider, P.E., a registered engineer duly licensed to practice in the State of Texas
do hereby certify that the mitigation calculations cut/fill balance in the floodplain for the
improvements of the project mentioned above have been carefully calculated and included in
our detention designed as shown on Sheet C8.0.
Sincerely,
PBK Civil Sports
H.F. SCHNEIDER, IN
69402 _
Trey Schneider
President
PBK Sports TX Firm No. 3709
2/27/13
Houston DallasiPort Worth San Antonio McAllen League City Austin
Time span=0.60-48_00 hrs, dt=0.05 hrs, 961 points
Runoff by SOSTR-20 method, UH=SCS
Reach routing by Stordnd+Trans method -Pond routing by Stor-Ind method
Subcatchment 2S: Pre -Develop Runoff Area=25A0o as 0.00% Invpen icus Runoff Depth=5,W
Flay Lsngth=300' Slape=0.0200'T To=43.5 min C14=80 Runoff=s3.44 ds 10.552 of
Subcatchment4S: Post Develop Runoff rrdaa.=25.000 an 28.ao% tmpen.ious a`noff oaptn=s.ss•
Flaw Lengttt=1,050' T�32.3 min CN=BS Run.fl=92,03 ds 124.e4 If
Snbcatchmeat 5S. Pre -Develop Runoff Area=48.700 ac 0.00?b pmpetvi;,us Runoff Depih=4.73"
FImYLengnt=300° SIoPI-0.00207 Trs108.2min Ui--77 Runoff-.53.Z9cia 18.3%af
Snbcatchment SS: Post Develop Runoff Area=9a.700 30 5.70% tmpe vlous Runoff Depth=5.fs5®
Flowiength-�tIO' Siopa�.0050 V Tc 75.T min CN--85 Runof-193.37ds 2t933 sf
Pond 3P: (new Pond) Feat SIa 254.2n' Stnmag 7.224 of In low--92.03 ds 12.464 of
autfly =13.72 ds 10.885 of
Total Runoff Area =14MU ac Runoff Volume = 53..344 of Average Runoff Depth 5.30,"
93.12%Pervious=1'33,540ac 6X9%ffnpervious=9:860ac
Time span=0.00-48.00 hrs, d=0.65 hrs, 961 points
Runoff bySCSTR-20 method, UH=SCS
Reach routing by &tor-ind+Trans method - Pond routing byS.tor-Ind method
Suucatchment 2S: Pre -Develop Runoff nsea--25.00 ac 0.00%lnpe iauu Runoff Deom=7.33m
Flow Lergth=?90` Slope=0.0200 `P Ts43,5 min Ct4- O Ru..9_99.2' ds 15.270 of
Suhcatchmentit& Past Develop Runoff Arsa=MNO ac 28-80%tnpsvious Rundf ogpzh=8.aa'
Flaw Lenth=1,0'.50' Tr M.3 min CN=88 Rumfr=12B.04 cfs 17,363 of
Subcatchment 5S: Pre -Develop Runoff Area=48. M ac A d43o Inpanrinus Runcn DeptlrW 5'
Flom Ltngtr=300' Slope-990207 Tt lC9,2mm CN=77 Ru otf-1012Rds 27.038af
Subcatchment 6S: Post Develop Runvsff Aral=4e.TOO ao 9.70% Imprvious Rum f f)epth=7.33" /
Fla v Lenmg 300` Slope=0.0050 °T Ta=75.7 min. IXN-85 Runoff=143.9S df 30.97E of ✓✓✓
Pond 3P: (new Pond) Peak El�255.79 Storage=10.125 of Inflan=120,04 ds 1TW3 of
t3u{Flos=t8.5 efz 15.554 of
Total Runoff Area.=143d00ac Runoff Volume=90,649af Average Runoff Depth=7.59"
93.12% Pervious= 133.540 ac 6,8a%Impervious=9.860ac
Time sPan=0.00-48.00 hrs, dt=0.65 hrs. 961 paints
Runoff by SCS TR-20 method,. UH=SCS
Reach routing by StoNnd-Trans method - Pond routing by Storand method
Subcatchment 2S. Pre-Devetop Ruiwff area=25.000 ao 0.00% Imprxticus Rrrtafr oepm=2.4 ,
Flms Lerntty-WO' Sla➢e=0.0200 `f TO=4a,6 mm C440 RurxW-33.00 ek 5,128 of
Subcatchment 4S: Post Develop Runmff area=25.000 ac 2S 8044 lmpwieus Runaa Depth--3.20"
FI. Le th=1,050' Ts32.3 min CN=38 Runoff=50.49 c e_859 sf
Subcatchment 55: Pre -Develop R.rt ff Ares= 700 ac 0.00% Impemlaus R.rt ff Depth=2.21"
Flow Slape=0.0020 T TrfCS.2 min CW77 Rvrrctr=32,OR efs SM3 of
Subcatchment 6S: Post Develop Runmfftrae ,7006e 5.T0%Imgwiaus Rurgff GeRth=2.91"
Flom Length=300' 31ap.-0.00507 TsT&T mitt CNJ 5 Rur.*-54," dr 11.32t of
Pond 311: (new Ponds Fe Eler-.253l7 Smr gy 3.775.f Inflm-50.43eF 5,55a.f
Ouffl,8.5e �. 4 88o of
Total Runoff Area=143.4130ac Runoff Volumo=31.711 of Average Runoff Depth =2.65-
93-12%Porvious.=133.540ac 6.88%Impervious=9.860ac