ميحرلا نمحرلا هللا مسب

BY THE NAME OF GOD

24 TO 28 FEBRUARY, 2020; WAD MEDANI AND

KASSALA, THE SUDAN

Africa to Asia: Testing Adaptation in Flood-Based

Resource Management Project

CURRICULUM REVIEW AND IMPROVEMENT WORKSHOP

GROUND

WATER

ARTIFICIAL

RECHARGE

IN GASH

BASIN

Introduction

One of the growing concerns facing scientists

and engineers is how to development and

management of groundwater resources

efficiently.

As we know the water is the nerve of life and

it’s also the base of any biological shapes of it, so

that world needs to developed and show more

care to this rescores.

Generally ground water is a very important

recourse of water that cause the sub-surface

reservoirs are very attractive and technically

feasible alternatives for storing monsoon run

off, also it can store very large quantity of

water.

The key to a successful

groundwater management

policy is thorough

understanding of

groundwater recharge and discharge processes.

In general ground water reserves is very important

rescore of water to Sudanese nation, and in study area

groundwater is the main source of water to the deferent

uses such as (drink, irrigation, wash …etc.)

And the gash river is the biggest source to recharge of

the gash aquifer in the flooding season, But in the last 20

years the study area (Kassala state) was facing many

problems that’s including backed in recharge that’s lead

to drooping in water table in this areas.

Ground water in east Sudan (specifically gash basin):

Maps of

Study area

Map shown

the dry wells

in the study

area

The objective of this study is to define a perfect

method that can make the surface water in the

flooding season percolation to the deep aquifer

more than its normal volume.

The study objective:

Is shown the deferent methods of artificial recharge

and defined which the perfect method that can give us

the perfect result in the study area, and that according

to many hydrological, geological and climate factors.

Methodology of research:

Artificial ground water recharge

What dose

artificial

ground water

recharge

means?!..

Under suitable conditions it is possible to supplement

the natural recharge of an aquifer and so add to its

safe yield, actually this is called artificial recharge. So

the artificial recharge means any human made

structure or technics that object to make the normal

recharge process act faster, and enhance the natural

percolation.

Normally Artificial recharge techniques address to

following issues :–

➢ To enhance the sustainable yield in areas where over-

development has depleted the aquifer.

➢ Conservation and storage of excess surface water for future

requirements, since these requirements often changes within a

season.

➢ To improve the quality of existing ground water through dilution.

➢ To remove bacteriological and other impurities from sewage and

waste water so that water is suitable for re-use.

➢ Availability of surface resource in place and time.

➢ Identification of suitable hydrogeological environment

and sites for creating subsurface reservoir through cost

effective artificial recharge techniques.

The basic requirements for recharging the ground water

reservoir are:

Groundwater is the main source of drinking and irrigation

water in the Gash basin, eastern Sudan. Due to

overexploitation groundwater levels have declined

steadily in the last decades and groundwater is partially

contaminated by agriculture.

About the project:

To solve this problem we need to create an artificial

recharge structure to enhance the natural ground water

recharge, and to do that we also need to study many

artificial recharge technics to define which the technics is

the best for the study area and the perfect place to apply

this technic.

There is many artificial recharge technics much

which we can talk about it in this presentation,

but we choose tow random method to explain,

and this methods is:

- Ditch and furrow method.- Recharge basin method.

- Ditch and furrow method

In areas with irregular topography, shallow, flat-bottomed

and closely spaced ditches or furrows provide maximum

water contact area for recharge water from the source

stream or canal. This technique requires less soil

preparation than recharge basins and is

less sensitive to silting. The next fig shows a typical plan for

a series of ditches originating

from a supply ditch and trending down the topographic

slope towards the stream.

Generally three patterns of ditch and

furrow systems are adopted:

a. Lateral ditch pattern.

b. Dendritic (tree-like) pattern.c. Contour pattern.

Artificial recharge basins are either excavated or are

enclosed by dykes.

They are commonly built parallel to ephemeral or

intermittent stream channels .

They can also be constructed at other locations where a

canal or any other water source provides the water.

-Recharge basin method:

THANKS FOR

ATTENTION