Written By: Ryan Sedar - 10/30/06
Updated to account for future conditions by: Emily Maurer - 3/26/07
Checked By: Keith Gray, PE - 3/27/07
Find Design Variables from StreamStats at http://water.usgs.gov/osw/streamstats/delaware.html
Note:
Prediction Interval: 50, 66.7, 75, 90
Enter either "0" for Piedmont Region or "1" for Coastal Plain Region
Enter drainage area in square miles
Enter the percentage of soil type A, in percent.
Enter the 2000 housing density in homes per acre
Enter the projected 25yr 2000 housing density in homes per acre (Bridge Design Manual requirement to design for future development )
Enter percent forest, in percent.
Enter percent impervious ground determined from the 2001 NLCD impervious dataset, in percent.
Enter the percent storage from NHD, in percent.
Enter the mean slope determined from a 10-Meter DEM, in percent.
Current Flows:
25 Yr Predicted Flows:
Calculation of Design Flows
All Design Flows are given in Cubic Feet per Second.
Design flows with confidence intervals:
Design flows with confidence intervals
and future development factor: