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Hydrographs

This  section was designed to provide information on the fundamentals of stormwater management. In this section, one will be able to learn the essentials concepts needed to understand and implement SWPPPs (Stormwater Pollution Prevention Plan) and BMPs (Best Management Practices).

The NPDES Permit Program is another topic covered under this section, and it is one of the main driving forces behind the majority of the mandated state and federal regulations. Under the NPDES Permit Program, stormwater discharges are considered point sources and operators of these sources may be required to receive an NPDES permit before they can discharge.

This NPDES Program was created through the authorities granted in The Clean Water Act, which was enacted by Congress and signed by the President to establish such environmental programs. The basis behind this act is to protect the Nation's waters and directs EPA to develop, implement, and enforce regulations consistent with this law.


Construction Activities

BMP Handbook

Click here to learn more about the various State Regulations concerning Stormwater Management

Design Guidance

Final Stabilization

Click here to learn more about the various Stormwater Rules and Notices presented by the EPA.

Regulated MS4s

Site Inspections

Click here to learn more about the various Federal Acts that may impact NPDES permitting.


Hydrographs are essential modeling outputs that are used as the basis of any intermediate steps of a proper stormwater management design. A hydrograph is a plot of the change of water runoff (discharge) with respect to time at a particular location. These plots are used to determine the peak discharges for pre- and post-development for varying Storm Events.

All proposed SWPPPs are required to submit all inflow and outflow hydrographs for each proposed outfall (point of discharge from the site). This graphs are used to determine the following information at each outfall: pre- and post-development velocities, peak rates of discharge, and the neccissity of structural control devices.

SC Regs. 72-307.A.3.(d)

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