Special Contributing Area Loading Program User’s Manual

Open-File Report 2024-1021
Prepared in cooperation with the U.S. Army Corps of Engineers
By:  and 



The Special Contributing Area Loading Program (SCALP) is a hydrologic routing program that simulates reservoir routing through a linear-reservoir-in-series method. The Java version of SCALP was developed to replicate and replace the functionality of an older version of the program written in Fortran. SCALP models flow through three reservoirs in series using an input runoff depth time series and information describing the hydrologic characteristics and sanitary flow for one or more land areas within a basin, supplied by the user. Each basin is herein referred to as a “Special Contributing Area” (SCA); the SCAs are a central concept in SCALP. Although flow through each SCA is routed separately, the user may simulate multiple SCAs in a batch simulation. The outputs of SCALP include information about flows through and overflows from the three reservoirs in the series.

Suggested Citation

Doyle, H.F., and Domanski, M.M., 2024, Special Contributing Area Loading Program user’s manual: U.S. Geological Survey Open-File Report 2024–1021, 15 p., https://doi.org/10.3133/ofr20241021.

ISSN: 2331-1258 (online)

Table of Contents

  • Acknowledgments
  • Introduction
  • Reservoir Routing
  • Usage
  • Model Results
  • Summary
  • References Cited
Publication type Report
Publication Subtype USGS Numbered Series
Title Special Contributing Area Loading Program user’s manual
Series title Open-File Report
Series number 2024-1021
DOI 10.3133/ofr20241021
Year Published 2024
Language English
Publisher U.S. Geological Survey
Publisher location Reston, VA
Contributing office(s) Central Midwest Water Science Center
Description Report: vi, 15 p.; Software Release
Online Only (Y/N) Y
Additional Online Files (Y/N) N
Google Analytic Metrics Metrics page
Additional publication details