Garden with Insight v1.0 Help: Soil daily water runoff group

Runoff volume from rainfall today: The amount of water running off the surface of this soil patch (not entering the patch) because of rainfall and snowmelt today.

Runoff volume from irrigation today: The amount of water running off the surface of this soil patch (not entering the patch) because of irrigation today.

Peak runoff rate from irrigation today: The fastest rate at which water flowed off the surface of soil during irrigation today. The peak runoff rate affects the amount of soil eroded by water flow as well as the amount of nutrients lost during water erosion.

Average curve number for runoff today: Used to generate SCS curve number used to calculate runoff (how much rain runs off the soil without entering it). Ranges from 30 to 95; lower means better water retention capacity. Modified by slope and adjusted daily for water content and temperature.

Curve number for runoff today: Used in runoff equation. Ranges from 30 to 95; lower means better water retention capacity. If 'Vary curve numbers randomly' is selected, generated with triangular distribution around average curve number; if not, is identical to average curve number.

Peak runoff rate from rainfall today: The fastest rate at which water flowed off the surface of soil during a rainstorm today. The peak runoff rate affects the amount of soil eroded by water flow as well as the amount of nutrients lost during water erosion.
Retention parameter today: Used to calculate runoff. Describes how much water the soil retained before the rainfall event occurred. Derived from the curve number (index of soil runoff potential). Modified by soil water content and distribution, and reduced if soil is frozen.

Rainfall duration today: How long it rained (or snowed) today. Roughly inversely proportional to the proportion of total rainfall that occurred during the first half-hour, which is generated from a triangular distribution around a parameter and modified if there was snow.

Rainfall rate at peak today: The fastest speed at which rainfall fell today. Determined by the proportion of total rainfall that occurred during the first half-hour and by the total amount of rainfall. The greater the proportion in the first half-hour, the greater the peak rate.

Rainfall time of concentration today: The length of time it took water flowing through the watershed (channel and surface) to move from the most distant point in the watershed to the outlet (the lowest point). Used in calculation of peak runoff rate, which affects soil eroded in runoff.

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