SCS Rainfall Library

The SCS Rainfall Library command allows you to store commonly used storm types for SCS method. The SCS has developed several standard distributions that cover the entire US, commonly known as the Type I, IA, II, and III storms. For situations where a standard rainfall distribution is not available or appropriate, you can create a localized rainfall distribution table in the SCS Rainfall Library. The default library file is in the Carlson Install Directory\USER folder and is available for all projects in sewer network design.

From the Network > Sewer Network Libraries menu in the Hydrology Module, select SCS Rainfall Library to open the library dialog. New button creates a new storm type entry, Edit button allows you to modify the highlighted entry, and Delete button removes the highlighted entry from the library. Load and SaveAs buttons allow you to load and save the library data. The Import CSV or (comma-separated values) allows the user to import rainfall depth data in csv or txt file formats. In the CSV file, only the fractional rainfall depth at every time increment is required. The fractional rainfall depth data should be between 0 and 1, and delimited by comma. The time increment value is entered on the dialog.

Rainfall Files

We have collected most of the rainfall distributions that are published on the NOAA website. The rainfall distribution data are all in 24-hour duration, and 90% frequency, the frantional rainfall depth value is between 0 and 1. You can load the SCS rainfall library file (.srn) of the desired region to the library to use it. Available regions are as follows:

California:

Data Flies:
    Region 1 - NOAA California Region 1.srn
    Region 2 - NOAA California Region 2.srn
    Region 3 - NOAA California Region 3.srn
    Region 4 - NOAA California Region 4.srn
    Region 5 - NOAA California Region 5.srn
    Region 6 - NOAA California Region 6.srn
    Region 7 - NOAA California Region 7.srn
    Region 8 - NOAA California Region 8.srn
    Region 9 - NOAA California Region 9.srn
    Region 10 - NOAA California Region 10.srn
    Region 11 - NOAA California Region 11.srn
    Region 12 - NOAA California Region 12.srn
    Region 13 - NOAA California Region 13.srn
    Region 14 - NOAA California Region 14.srn

California Temporal Distribution Area Map

Hawaiian Islands Region:

Data Files:
    Region - NOAA Hawaiian Islands.srn

Hawaiian Islands Temporal Distribution Area Map

Semiarid:

Data Files:
    Semiarid SW Convective Area Region: NM, AZ - NOAA Semiarid SW Convective Area.srn
    Semiarid SW General Precipitation Region: UT,NV - Semiarid SW General Precipitation.srm

Semiarid Temporal Distribution Area Map

Midwest:

Data Files:
    Region 1: SD, ND, MN, WI, MI - NOAA Midwestern Region 1.srn
    Region 2: Southwest corner of CO - NOAA Midwestern Region 2.srn
    Region 3: OK, NE, KS, IA, CO - NOAA Midwestern Region 3.srn
    Region 4: Missouri - NOAA Midwestern Region 4.srn

Midwest Temporal Distribution Area Map

Southeast:

Data Files:
    Region 1: AR, LA, MS, AL, GA - NOAA Southeast Region 1.srn
    Region 2: FL - NOAA Southeast Region 2.srn

Southeast Temporal Distribution Area Map

Ohio River Basin Region: SC, NC, TN, KY, WV, IL, IN, OH, VA, MD, Washington D.C.,   Delaware, NJ, PA

Data Files:
    Region - NOAA Ohio River Basin.srn

Ohio River Basins and Surrounding States Temporal Distribution Area Map

Alaska

Data Files:
    Region 1: Upper Part of Alaska - NOAA Alaska Region 1.srn
    Region 2: Juneau, Aleutian Islands - NOAA Alaska Region 2.srn

Alaska Temporal Distribution Area Map

Puerto Rico and the US Virgin Islands

Data Files:
    Region - NOAA Puerto Rico and the U.S. Virgin Islands.srn

Puerto Rico and US Virgin Islands Temporal Distribution Area Map

Selected Pacific Islands

Data Files:
    Region - NOAA Selected Pacific Islands.srn

Selected Pacific Islands Temporal Distribution Area Map

Prompts

SCS Rainfall Library dialog: Fill in values.

Pulldown Menu Location: Network > Sewer Network Libraries > SCS Rainfall Library
Keyboard Command: scsrainlib
Prerequisite: None