Govt of Bihar
    Analysis,Planning & Design Tool:   Planninmg of new Flood Protection works

  INTRODUCTION
Flood protection schemes are to be prepared based on the recommendations of the Anti-Erosion Committees and put up before State TAC for their consideration. Chief Engineer of the concerned sector will prepare a damage assessment report by compiling all damage data after thorough investigation and survey. This damage report should contain damage to various assets of Water Resource Department
   
  IDENTIFICATION OF NEW FLOOD SCHEMES
Scheme identification should be very selective and well considered, supported by adequate investigation. For identification of proposed flood protection works, following points may be kept into consideration: The zone exactly affected by erosion. Morphological conditions of river flow in the reach b/w 5 km upstream and downstream of affected reaches. Bank lines for previous 5 years for assessing erosion trends and causes. River regime plan showing both bank based on latest satellite imageries. Losses incurred in the past due to the erosion at the site. Assessment of long term and short term effects of the proposed anti-erosion work on upstream, downstream and opposite bank. The location and effects of flood management works already executed in the vicinity, whether existing or damaged. Bank to bank river cross sections. The initial response in tackling the erosion should be towards channelizing the river in central. Impermeable spur or bed bar should never be constructed in isolation. Use sheet piles instead of launching apron of boulders for toe protection especially in critical erosion sites. Construction of bed bars should preferably be of submerged. Use of Geo textile bags filled with sand has emerged and should be adopted as substitute for boulders. For raising & strengthening of embankment schemes, justify by giving details of observed incidences of over topping or undesirable encroachment. Soil characterization of the river stability of the river banks is essential to successful bank erosion protection and construction of good quality stable embankments. Availability of bed material data and suspended silt very important for realistic planning of flood/erosion protection works. Drainage sluices are recommended to be made an integral part of embankments to prevent water-logging in the protected areas. Any new work in the vicinity of any on-going flood management should be prepared only after full implementation of the ongoing work. Stress has to be laid on improving the existing natural drainage system in the flood plains. The adequacy of existing sluices and drainage channels should be reviewed in areas suffering from drainage congestion.
   
 

  Analysis and Planning of New Works
  1. Along the Rivers:
Protection of River Banks for various measures Construction of New Embankment if the river is spilling over the bank causing damage to the important installations
2. Along the Existing Embankments:
 Provision of protection works along the existing embankments which may be required in the following conditions: 
   
 

Problem Encountered

Suggestion for Planning of New Works

Spilling of the river water in the country side & effecting the villages and important installations Plan for new Embankment to check spill of water
*To control the erosion of meandering bank of the river
*To check the erosion of the bank / embankment where erosion is severe and space is available
*To repel the current away from the bank / to attract the current towards the bank of the river for distillation of the river 		Construct spurs
Where there is sloughing of river bank / embankment Or there is scouring of the river bed Bed bars should be provided for inducing siltation near the river bank
When river is flowing very near to the embankment / river bank, and no space is available for the construction of spurs Revetment should be proposed where river is flowing very near to the river bank / embankment.
When erosion of the bank / embankment is taking place in a big length and it is not very much serious. Availability of the stone for the construction of spur / revetment is not feasible to construct Plan for porcupine to check the erosion
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