You should be able to get soils information using this process:
1. go to http://soildatamart.nrcs.usda.gov/ and select your state (WA)
2. select the county where the soil is located
3. click Select Survey Area
4. click on "Generate Reports"
5. select the soil mapping unit you want info or...
Does anyone have a general rule of thumb they use to determine the length of sheet flow for use in TR-55 time of concentration calculations? I know the max. length is 300', but I have been wondering if there are some situations (aside from change in slope) that would cause someone to use say...