Question

In: Civil Engineering

The watershed shown in the figure below is located in Bowling Green, Kentucky (western Kentucky). The entire...

The watershed shown in the figure below is located in Bowling Green, Kentucky (western Kentucky). The entire watershed is 100 acres in size and is predominantly forested (woods in good condition) before mining begins. The soils are Macomber (HSG C) and Saragosa (HSG B) with about 50% of the entire watershed in each. These soil types do not change when mining happens. One seam of coal is to be surface mined as indicated in the figure below (hatched area), with this strip mine land-use being considered “cultivated land without conservation treatment.” The remaining non-mined land use remains as forested. Please feel free to treat the mining strip (hatched) area as a rectangle with the width 180 ft and length 4500 ft (18.6 acres).

(2.5 points) Calculate the Curve Number for the Before Mining watershed condition

(2.5 points) Determine how much of the rainfall falling on this before mining watershed would be removed as initial abstractions.

(2.5 points) Calculate the Curve Number for the After Mining watershed condition.

(2.5 points) Determine how much of the rainfall falling on this after mining watershed would be removed as initial abstractions.

Expert Solution

Ans a) Before mining condition :

According to NRCS, TR-55 method,

Curve number for HSG B soil with woods in good condition = 55

Curve number for HSG C soil with woods in good condition = 70

Averge CN = 0.50(55) + 0.50(70) = 62.5 63

Ans b) We know,

Initial abstraction , Ia = 0.20 S

S = Potential maximum retention = (1000/CN) - 10

=> S = (1000/63) - 10 = 5.87 in

=> Ia = 0.20 x 5.87 = 1.175 in

Hence, about 1.175 in of rainfall on this watershed will removed as initial abstraction before mining

Ans c) After mining condition :

According to NRCS, TR-55 method,

Curve number for HSG B soil with cultivated land without treatment = 78

Curve number for HSG C soil with cultivated land without treatment = 85

Average CN for mine = 0.50(78) + 0.50(85) = 81.5 82

Average CN for forested land = 63 (calculated above)

Area weighted CN for whole watershed, CN = CNi Ai / A

=> CN = [(18.6 x 82) + (81.4 x 63)] / 100

=> CN = 66.53 67

Ans d) We know,

Initial abstraction , Ia = 0.20 S

S = Potential maximum retention = (1000/CN) - 10

=> S = (1000/67) - 10 = 4.925 in

=> Ia = 0.20 x 4.925 =0.985 in

Hence, about 0.985 in of rainfall on this watershed will removed as initial abstraction after mining

Ally Wells answered 8 months ago

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