# Internship report at Central water commission, Delhi **Project Name**:Effective fetch calculator for freeboard of dam/vessel(Web portal) **Project view link**: https://coder-harsh.github.io/freeboard-calculator/ **Source code link**: https://github.com/coder-harsh/freeboard-calculator **Tech stacks used**: (Front-end)HTML, CSS, Javascript **Web portal hosting platform**: https://github.com/ **Tools used**: VS Code **References**: https://drive.google.com/file/d/1KEdxbynOSHq4XCi7YXPXnTIaue7aSC6Z/view?usp=sharing ### Source codes ```plaintext Freeboard Calculator

Effective fetch calculator for freeboard of dam/vessel

X_i	cosα	X_icosα*cosα








∑cosα=		∑X₁cosα*cosα=
	Effective fetch

``` ### Repo images ![Screenshot 2022-03-19 080000.png](https://cdn.hashnode.com/res/hashnode/image/upload/v1647657012044/FA8_lRfWS.png align="left") ### Study of effective fetch for freeboard of dam/vessel **Scope** This standard gives guidelines regarding procedures for working out freeboard for embankment dams. **Design Wave Height** It is that wave height which the structure is clesigncd to withstand so that it does not undergo more than the accepted probability of damage, should the same wave height be exceeded. It is a suitable multiple of the significant wave height depending on the degree of risk to be accepted. \*\*Fetch Length \*\* It is the straight line distance along the wind direction ( along central radial of fetch ) over open water on which the wind blows. **Efective Fetch** It is the weighted average fetch length of water spread, covered by 45” angle on either side of trial fetch ( assuming the wind to be completely non-effective beyond this area ) and measured in a direction parallel to the central radial line of the trial fetch. \*\*Fetch Length \*\* It is the straight line distance along the wind direction ( along central radial of fetch ) over open water on which the wind blows. \*\*Effective Fetch \*\* It is the weighted average fetch length of water spread, covered by 45” angle on either side of trial fetch ( assuming the wind to be completely non-effective beyond this area ) and measured in a direction parallel to the central radial line of the trial fetch. **Wave Length** : It is the length in m from crest to crest for significant wave \*\*Free Board \*\* It is the vertical distance betwaeen the crest of embankment ( excluding camber ) and the still reservoir water surface. * *Normal Free Board*: It is the freeboard above the full reservoir level (FKL). * *Minimum Freeboard*:It is the freeboard above the maximum water level ( MWI> ) worked out for designed inflow flood. ### Factors affecting for freeboard \-Wave characteristics, particularly wave -height and wave length; -Height of wind set-up above the still water -level adopted as freeboard reference elevation; and Slope of the dam and roughness of the pitching. ### Notations **F**_e\= Effective fetch **α**\= Axial angle **X**_i\=Radial Length ### Formula for effective fetch **F**_e\= ∑(X1cosα\*cosα)/∑cosα \*\*Sample table data for acknowledgement \*\* | α | cosα | X₁ | X₁cosα | X₁cosα\*cosα | | --- | --- | --- | --- | --- | | 42° | 0.743 | 2.08 | 1.55 | 1.151 | | 36° | 0.809 | 2.29 | 1.85 | 1.499 | | 30° | 0.866 | 4.73 | 4.10 | 3.550 | | 24° | 0.914 | 4.32 | 3.95 | 3.610 | | 18° | 0.951 | 4.26 | 4.05 | 3.851 | | 12° | 0.978 | 5.11 | 5.00 | 4.890 | | 6° | 0.955 | 5.68 | 5.65 | 5.621 | | 0° | 1.000 | 6.00 | 6.00 | 6.000 | | 6° | 0.955 | 5.18 | 5.15 | 5.124 | | 12° | 0.978 | 3.37 | 3.30 | 3.227 | | 18° | 0.951 | 2.95 | 2.80 | 2.662 | | 24° | 0.914 | 2.90 | 2.65 | 2.422 | | 30° | 0.866 | 2.08 | 1.55 | 1.151 | | 36° | 0.809 | 3.09 | 2.50 | 2.023 | | 42° | 0.733 | 3.16 | 2.35 | 1.746 | | | ∑cosα=13.512 | ∑=49.454 | **F**_e\=(49.451)/13.512=3.66k.m *Submitted by* | Name | Reg. no | Branch | Semester | | --- | --- | --- | --- | | Harsh Kumar | 19104131006 | ECE | 5th | Submitted to:- To, The Director, CMDD (N&W) Dte., Central Water Commission, 8th Floor (S), Sewa Bhawan, R.K. Puram-1, New Delhi-110066