A two-hour rainfall event steadily delivers 2.5 cm/hr to a 150-hectare watershed with the following characteristics: • 50 hectares are ½ acre residential lots, hydrologic soil group B, 25% imperviousness • 100 hectares are row crops (corn, contoured, good condition, hydrologic group C) • Antecedent soil moisture condition is AMC II • The soils are loam with 2% organic matter • The slope is 2% with slope length 100m → Assume LS factor = 0.25 a) Use a weighted average CN to estimate the runoff depth (Q) in mm over the entire 150 ha area for: i) the first 30 minutes of the storm, and ii) the entire storm. b) Estimate the gross erosion from the row crops (not the residential area) during this event in metric tonnes / ha. c) Estimate the clay enrichment ratio if the sediment transported in the storm runoff is composed of 40% clay. Remember the soils are loam.

A two-hour rainfall event steadily delivers 2.5 cm/hr to a 150-hectare watershed with the following characteristics: • 50 hectares are ½ acre residential lots, hydrologic soil group B, 25% imperviousness • 100 hectares are row crops (corn, contoured, good condition, hydrologic group C) • Antecedent soil moisture condition is AMC II • The soils are loam with 2% organic matter • The slope is 2% with slope length 100m → Assume LS factor = 0.25 a) Use a weighted average CN to estimate the runoff depth (Q) in mm over the entire 150 ha area for: i) the first 30 minutes of the storm, and ii) the entire storm. b) Estimate the gross erosion from the row crops (not the residential area) during this event in metric tonnes / ha. c) Estimate the clay enrichment ratio if the sediment transported in the storm runoff is composed of 40% clay. Remember the soils are loam.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Sediment transport

Sediment transport or Soil transport is the movement of solid particles, usually due to the combination of gravitational forces acting on the sediment, and the movement of the liquid at which the sediment enters. Soil erosion occurs in natural systems where the particles are sandstones (sand, rocks), mud, or clay; the liquid is air, water, or ice; and the gravitational force that works to move particles to the landing surface. Sediment transportation or soil migration due to the movement of liquids occurs in rivers, lakes, lakes, oceans, and other bodies of water as a result of currents and waves. Transportation is also caused by glaciers as they flow, and to places on earth under the influence of wind. Soil erosion due to gravity alone is possible in most sloping areas, including hills, scarves, cliffs, and the continental shelf — the continental boundary of the slope.

Question

A two-hour rainfall event steadily delivers 2.5 cm/hr to a 150-hectare watershed with the
following characteristics:
50 hectares are ½ acre residential lots, hydrologic soil group B, 25% imperviousness
100 hectares are row crops (corn, contoured, good condition, hydrologic group C)
Antecedent soil moisture condition is AMC II
The soils are loam with 2% organic matter
The slope is 2% with slope length 100m → Assume LS factor = 0.25
a) Use a weighted average CN to estimate the runoff depth (Q) in mm over the entire 150 ha
area for:
i) the first 30 minutes of the storm, and
ii) the entire storm.
b) Estimate the gross erosion from the row crops (not the residential area) during this event
in metric tonnes / ha.
c) Estimate the clay enrichment ratio if the sediment transported in the storm runoff is
composed of 40% clay. Remember the soils are loam.
d) Assuming a sediment delivery ratio of 45%, provide a rough estimate of the average
sediment concentration delivered from the row crops to the watershed outlet during this
event. Express your answer in mg/liter.

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