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Water Management Practice (Solved Problem)

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Water management practices play a crucial role in addressing the challenges of water scarcity, inefficient usage, and declining groundwater levels, especially in agricultural and drought-prone regions. A solved problem in this field illustrates how adopting appropriate water management strategies can lead to improved water use efficiency, better crop performance, and sustainable resource conservation. In a farming region dependent on canal irrigation, farmers experienced irregular water supply during critical crop stages. Over-reliance on groundwater led to a rapid decline in the water table, affecting long-term sustainability. Management Practice Implemented: Conjunctive Water Use: Farmers were trained to manage irrigation using both surface water (from canals) and groundwater in a balanced way. Scheduling Irrigation: Scientific irrigation scheduling based on crop water requirements and weather forecasts was introduced. Construction of Recharge Pits: Small recharge wells and pits were built to enhance groundwater recharge during rainy periods. Field Application Techniques: Use of lined channels and efficient field application methods (like surge irrigation) reduced water losses.

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Problem #1
A sample of moist soil having a wet mass of 1000 gm and a volume of
640 cm3 was dried in the oven and found to have a dry mass of 800 gm
Assuming the typical value of particle density (ρp ) 2.65 g/cm3.
Calculate:
(1) bulk density (ρb), (2) porosity (f), (3) void ratio (e),
(4) mass wetness (w), (5) volume wetness (θ),
(6) water volume ratio (vw), (7) degree of saturation (s),
(8) and air-filled porosity (fa)

, Solution:
(1) Bulk density:
𝑀𝑠 800
ρ𝑏 = = = 1.25gm/cm3
𝑉 640
(2) Porosity:
ρ𝑏 1.25𝑔𝑚/𝑐𝑚3
𝑓 =1− =1− 3 = 1 - 0.472 = 0.528×100 = 52.8%
ρ𝑠 2.65 𝑔𝑚/𝑐𝑚
𝑉𝑓 𝑉𝑡− 𝑉𝑠
(3) void ratio: 𝑒 = =
𝑉𝑠 𝑉𝑠
𝑴𝒔
𝝆𝒔 =
𝑽𝒔
𝑀𝑠 800𝑔𝑚 3
𝑉𝑠 = = 3 = 301.9 cm
ρ𝑠 2.65 𝑔𝑚/𝑐𝑚

640 cm3−301.9 cm3
𝑒= =1.12
301.9 cm3

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