NRCS-NJ Updates and Revisions
UH (2003) Hydrologic soil group designations (2006) Rainfall data (2004, NOAA Atlas 14 Vol II) Storm distributions (update underway)
Delmarva
County-based rainfall distributions
distribution for each return period (1 to 500 year storms) Will replace Type III distribution for NJ
Unique
New Distributions vs Type III Effects on Peak Discharges
1 year to 10 year storms: similar results 25 year to 100 year storms: lower peaks with new distributions
Sussex,Hunterdon: 100 yr: 4-9% lower Passaic: 100 yr: 14-18% lower Monmouth, Ocean: 100 yr: 12-16% lower Salem: 100 yr: 12% lower
NRCS Software
Hydrology
EFH-2 winTR55 winTR20 NRCS Geo-Hydro
www.wcc.nrcs.usda.gov
Software
Dams
winPOND
www.nrcs.usda.gov/technical/ENG/software_tools.html
SITES
www.wcc.nrcs.usda.gov
winDAM
THREE-PHASE EROSION PROCESS
1. SURFACE EROSION (COVER PROTECTION)
• SURFACE DISCONTINUITIES • SOD STRIPPING
2. CONCENTRATED FLOW EROSION
3. HEADCUT ADVANCE
COVER LOCALLY REMOVED
CONCENTRATED FLOW EROSION
EXPANDING HEADCUT
winDAM
under development ARS and KSU with support from FEMA & NRCS Will analyze overtopping failure Eventually to include piping failure
Currently
Question?