**Problem Statement:**An unconfined aquifer has a hydraulic conductivity of 25 mm/sec. There are two observation wells 458 ft apart. Both wells penetrate the aquifer to the bottom. In one observation well, water stands 28.8 ft above the bottom at a radius of 687 ft, and in the other, it stands 22.5 ft above the bottom.**Question:** What is the discharge per 100-foot-wide strip of the aquifer in square feet per day?**Explanation:** The problem describes an unconfined aquifer with given hydraulic conductivity and distances between wells. The water levels above the bottom of the aquifer in two wells are provided. The task is to calculate the discharge using the information given, applying hydrological principles.**Note:** This problem can be solved using Darcy's Law and related hydrological formulas to determine the rate of groundwater flow between the wells based on the hydraulic gradient and conductivity.

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3. An unconfined aquifer has a hydraulic conductivity of 25 mm/sec. There are two observation wells 458 ft apart. Both wells penetrate the aquifer to the bottom. In one observation well water stands 28.8 ft above the bottom at a radius of 687 ft, and in the other it stands 22.5 ft above the bottom. What is the discharge per 100-foot-wide strip of the aquifer in square ft per day?

3. An unconfined aquifer has a hydraulic conductivity of 25 mm/sec. There are two observation wells 458 ft apart. Both wells penetrate the aquifer to the bottom. In one observation well water stands 28.8 ft above the bottom at a radius of 687 ft, and in the other it stands 22.5 ft above the bottom. What is the discharge per 100-foot-wide strip of the aquifer in square ft per day?

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

Groundwater Flow

The term groundwater refers to the water which is found beneath the earth's surface. Pores present in the soil and rocks with fractures make a passage for rainwater to enter the earth's surface and deposit as groundwater. The flow nature and direction of groundwater under the earth's surface directly impacts the strength and compressibility of the soil, which reflects its ability to support structural loads.

Question

**Problem Statement:**

An unconfined aquifer has a hydraulic conductivity of 25 mm/sec. There are two observation wells 458 ft apart. Both wells penetrate the aquifer to the bottom. In one observation well, water stands 28.8 ft above the bottom at a radius of 687 ft, and in the other, it stands 22.5 ft above the bottom.

**Question:**
What is the discharge per 100-foot-wide strip of the aquifer in square feet per day?

**Explanation:**
The problem describes an unconfined aquifer with given hydraulic conductivity and distances between wells. The water levels above the bottom of the aquifer in two wells are provided. The task is to calculate the discharge using the information given, applying hydrological principles.

**Note:**
This problem can be solved using Darcy's Law and related hydrological formulas to determine the rate of groundwater flow between the wells based on the hydraulic gradient and conductivity.

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With an observation well situated is 69.7 ft away from the pumping well (which is pumping at the rate of 305 gal/min). The aquifer is confined, and the depth has been measured from well logs and is 150 ft. please show using this data how to calculate transmissivity (T), the hydraulic conductivity (K) and Storativity (S) for the aquifer. Thank You s (m) t (sec) 20.7 4074.3 30.76 6054.6 46.3 9054.6 67.33 13254.6 107.26 21114 152.67 30054 209.37 41274 305.38 60114 451.68 88914 671.44 132174 946.07 186234 1321.9 260214
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Problem 1. Consider a drainage system that consists of horizontal drains located at an elevation ho above the base of an unconfined aquifer of thickness b 10 m (see Figure 1). The recharge rate is r = 100 mm/yr, and the hydraulic conductivity of the aquifer is K = 1 m/d. The design condition of the drainage system is to avoid ponding at the ground surface. You can ignore the vadose zone for this problem. 1. Obtain the relation between the half-distance between drains, L, and the elevation of the drains, ho. Plot this function over the range of feasible lengths. 2. The cost of each individual drain can be split as the cost of the material (fixed) and the cost of installation (which is assumed to be proportional to the depth b – ho). If the fixed cost is $500 and the installation cost is $100 per meter of aquifer length per meter of depth, can you build a drainage system for less than $1 per meter of aquifer length? If so, what depth ho and spacing 2L would you choose? K= 1 m/day 2L = r…
QUESTION 1 Calculate the transmissivity of an artesian aquifer that has a thickness of 5.5 m and is pumped at a rate of 1.52 m³/min. There are two observation wells located at 150 m and 280 m away with drawdowns of 0.8 and 0.72 m respectively. (15) QUESTION 2 An aquifer has T = 175 m²/day, S = 1.3 x104, and provides a flow of 20 L/s to a well. Find the drawdown at the two observation wells located 15 and 65 m from the producing well after 1 day, 2 months, 10 months and 2 years. (15)
ENVIRONMENTAL ENGINEERING ( Practice Questions) a). Suppose a well 0.36m in diameter has been pumped at a rate of 3,000cu.m/day for a long enough time that steady-state conditions apply. An observation well located 30m from the pumped well has been drawn down by 1.0m, and another well at 120m is drawn down by 0.4m. The pumped well extends completely through an unconfined aquifer 60.0m thick. GIVEN: For an unconconfined aquifer, Q = πK(h2c1 – h2c2) / [Ln(r1 / r2)] Determine the hydraulic conductivity, K. (7 marks) (ii) Estimate the drawdown at the pumped well. State any assumptions made. b). A confined aquifer 40.0 m thick has two monitoring wells spaced 400m apart along the direction of groundwater flow. The difference in water level in the wells is 4.0m (the difference in piezometric head). The hydraulic conductivity is 40m/day. Estimate the rate of flow per meter of distance perpendicular to the flow. C). Suppose the aquifer, which has a…