$358$

Groundwater $-$ Multidimensional Flow and Applications the toe drain. This perforated the one shown in Figure $8\mathrm{.}37.$ The design flow rate taped with a filter fabric, similar foot, and the maximum acceptable head loss is $0\mathrm{.}10ft.$ the ${?}^2$ drain is $80ga\frac{l}{m}in$ per squ Table $8\mathrm{.}2.$

an appropriate

Comprehensive placing the clayey fill showhway from flooding. It is contractor plans to make a temporary excavation using steel sheet piles be backfilled and the pumps and roject:

tasks in connection with the proposed cross$-$section is symmetrical, redraw half of it to a scale of $1in.=10ft$ and construct a flow net.

$($b$)$ Determine where the largest hydraulic gradient occurs and mark this spot on the cross. section.

FIGURE $8\mathrm{.}46$ Cross$-$section for Problem $8\mathrm{.}20.$ el$.=$ elevation.