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TECHNICAL SUPPORT 2 HydraulicsCatchment hydraulics Calculating runoffQ (L/s) Area (AxB) x Rainfall intensity (C) 60 (minutes) x 60 (seconds)The catchment runoff must be accurately calculated to determine
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How to fill out runoff calculations

01
Gather relevant data: Collect rainfall data, land use information, and soil types.
02
Determine the area: Calculate the total area of the land for which you are estimating runoff.
03
Identify the curve number (CN): Use the NRCS method to select the appropriate curve number based on land use and hydrologic conditions.
04
Calculate potential runoff: Use the formula Q = (P - 0.2S)^2 / (P + 0.8S), where Q is the runoff, P is the total rainfall, and S is the potential retention.
05
Adjust for local conditions: Consider factors like slope, vegetation cover, and drainage patterns that can affect runoff.
06
Document the results: Compile the calculations and any assumptions made in the process.

Who needs runoff calculations?

01
Urban planners who design stormwater management systems.
02
Civil engineers working on construction and infrastructure projects.
03
Environmental scientists assessing watershed health and management.
04
Agricultural professionals managing irrigation and runoff in fields.
05
Regulatory agencies monitoring compliance with environmental regulations.
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Runoff calculations are assessments used to determine the amount of water that runs off a specific area of land, typically after precipitation, and evaluates how this runoff affects surrounding ecosystems and infrastructure.
Individuals or entities involved in land development, agricultural practices, or industrial operations that may affect water drainage are generally required to file runoff calculations.
Filling out runoff calculations typically involves gathering data about land use, soil type, rainfall patterns, and drainage systems, and then applying hydrological models or formulas to estimate runoff volumes.
The purpose of runoff calculations is to manage water resources effectively, prevent flooding, protect water quality, and ensure compliance with environmental regulations.
Information that must be reported includes site characteristics, hydrological data, runoff coefficients, and any mitigating measures taken to manage runoff.
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